1. Which information is used by routers to forward a data packet toward its destination?
source IP address destination IP address* source data-link address destination data-link address
2. A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?
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The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host. The packet will be sent directly to the destination host.* The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host. The packet will be sent only to the default gateway.
You are viewing: Which Interfaces In Each Router Are Active And Operational
3. A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What
will the router do next? route the packet out the Gigabit 0/1 interface create a new Layer 2 Ethernet frame to be sent to the destination* look into the ARP cache to determine the destination IP address look into the routing table to determine if the destination network is in the routing table
4. Which IPv4 address can a host use to ping the loopback interface?
126.0.0.1 127.0.0.0 126.0.0.0 127.0.0.1*
5. A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?
The cable is not connected properly to the NIC. The computer has an invalid IP address. The computer has an incorrect subnet mask. The computer has an invalid default gateway address.*
6. Which statement describes a feature of the IP protocol?
IP encapsulation is modified based on network media. IP relies on Layer 2 protocols for transmission error control. MAC addresses are used during the IP packet encapsulation. IP relies on upper layer services to handle situations of missing or out-of-order packets.*
7. Why is NAT not needed in IPv6?
Because IPv6 has integrated security, there is no need to hide the IPv6 addresses of internal networks. Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.* The problems that are induced by NAT applications are solved because the IPv6 header improves packet handling by intermediate routers. The end-to-end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.
8. Which parameter does the router use to choose the path to the destination when there are multiple routes available?
the lower metric value that is associated with the destination network* the lower gateway IP address to get to the destination network the higher metric value that is associated with the destination network the higher gateway IP address to get to the destination network
9. What are two services provided by the OSI network layer? (Choose two.)
performing error detection routing packets toward the destination* encapsulating PDUs from the transport layer* placement of frames on the media collision detection
10. Within a production network, what is the purpose of configuring a switch with a default gateway address?
Hosts that are connected to the switch can use the switch default gateway address to forward packets to a remote destination. A switch must have a default gateway to be accessible by Telnet and SSH. The default gateway address is used to forward packets originating from the switch to remote networks.* It provides a next-hop address for all traffic that flows through the switch.
11. What is a basic characteristic of the IP protocol?
Connectionless* media dependent user data segmentation reliable end-to-end delivery
12. Which field in the IPv4 header is used to prevent a packet from traversing a network endlessly?
Time-to-Live* Sequence Number Acknowledgment Number Differentiated Services
13. What is one advantage that the IPv6 simplified header offers over IPv4?
smaller-sized header little requirement for processing checksums smaller-sized source and destination IP addresses efficient packet handling*
14. What IPv4 header field identifies the upper layer protocol carried in the packet?
Protocol* Identification Version Differentiated Services
15. Refer to the exhibit. Match the packets with their destination IP address to the exiting interfaces on the router. (Not all targets are used.)
16. What information does the loopback test provide?
The TCP/IP stack on the device is working correctly.* The device has end-to-end connectivity. DHCP is working correctly. The Ethernet cable is working correctly. The device has the correct IP address on the network.
17. What routing table entry has a next hop address associated with a destination network?
directly-connected routes local routes remote routes* C and L source routes
18. How do hosts ensure that their packets are directed to the correct network destination?
They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.* They always direct their packets to the default gateway, which will be responsible for the packet delivery. They search in their own local routing table for a route to the network destination address and pass this information to the default gateway. They send a query packet to the default gateway asking for the best route.
19. When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?
Next Header Flow Label* Traffic Class Differentiated Services
20. What statement describes the function of the Address Resolution Protocol?
ARP is used to discover the IP address of any host on a different network. ARP is used to discover the IP address of any host on the local network. ARP is used to discover the MAC address of any host on a different network. ARP is used to discover the MAC address of any host on the local network.*
21. Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? (Choose two.)
The frame has the broadcast address as the destination address.* The destination address is unknown to the switch.* The source address in the frame header is the broadcast address. The source address in the frame is a multicast address. The destination address in the frame is a known unicast address.
22. Which statement describes the treatment of ARP requests on the local link?
They must be forwarded by all routers on the local network. They are received and processed by every device on the local network.* They are dropped by all switches on the local network. They are received and processed only by the target device.
23. Which destination address is used in an ARP request frame?
0.0.0.0 255.255.255.255 FFFF.FFFF.FFFF* AAAA.AAAA.AAAA the physical address of the destination host
24. A network technician issues the arp -d * command on a PC after the router that is connected to the LAN is reconfigured. What is the result after this command is issued?
The ARP cache is cleared.* The current content of the ARP cache is displayed. The detailed information of the ARP cache is displayed. The ARP cache is synchronized with the router interface.
25. Refer to the exhibit.
The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?
The switch will discard the frame. The switch will forward the frame only to port 2. The switch will forward the frame to all ports except port 4.* The switch will forward the frame to all ports. The switch will forward the frame only to ports 1 and 3.
26. Which two types of IPv6 messages are used in place of ARP for address resolution?
anycast broadcast echo reply echo request neighbor solicitation* neighbor advertisement*
27. What is the aim of an ARP spoofing attack?
to flood the network with ARP reply broadcasts to fill switch MAC address tables with bogus addresses to associate IP addresses to the wrong MAC address* to overwhelm network hosts with ARP requests
28. Refer to the exhibit.
PC1 attempts to connect to File_server1 and sends an ARP request to obtain a destination MAC address. Which MAC address will PC1 receive in the ARP reply?
the MAC address of S1 the MAC address of the G0/0 interface on R1* the MAC address of the G0/0 interface on R2 the MAC address of S2 the MAC address of File_server1
29. Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?
neighbor table ARP cache* routing table MAC address table
30. What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward?
source MAC address source IP address destination MAC address* Ethernet type destination IP address
31. Match the commands to the correct actions. (Not all options are used.)
32. A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?
Reboot the device. Enter CTRL-Z at the privileged mode prompt. Exit global configuration mode. Power cycle the device. Exit privileged EXEC mode and press Enter.*
33. A network administrator requires access to manage routers and switches locally and remotely. Match the description to the access method. (Not all options are used.)
34. Match the phases to the functions during the boot up process of a Cisco router. (Not all options are used.)
35. Match the command with the device mode at which the command is entered. (Not all options are used.)
36. What are two functions of NVRAM? (Choose two.)
to store the routing table to retain contents when power is removed* to store the startup configuration file* to contain the running configuration file to store the ARP table
37. A router boots and enters setup mode. What is the reason for this?
The IOS image is corrupt. Cisco IOS is missing from flash memory. The configuration file is missing from NVRAM.* The POST process has detected hardware failure.
38. The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?
The switch will have a management interface with the address 172.16.100.1. The switch can be remotely managed from a host on another network.* The switch can communicate with other hosts on the 172.16.100.0 network. The switch is limited to sending and receiving frames to and from the gateway 172.16.100.1.
39. What happens when the transport input ssh command is entered on the switch vty lines?
The SSH client on the switch is enabled. Communication between the switch and remote users is encrypted.* The switch requires a username/password combination for remote access. The switch requires remote connections via a proprietary client software.
40. Refer to the exhibit.
A user PC has successfully transmitted packets to www.cisco.com. Which IP address does the user PC target in order to forward its data off the local network?
172.24.255.17 172.24.1.22 172.20.0.254* 172.24.255.4 172.20.1.18
41. Match the configuration mode with the command that is available in that mode. (Not all options are used.)
42. Which three commands are used to set up secure access to a router through a connection to the console interface? (Choose three.)
interface fastethernet 0/0 line vty 0 4 line console 0* enable secret cisco login* password cisco*
43. Refer to the exhibit.
Consider the IP address configuration shown from PC1. What is a description of the default gateway address?
It is the IP address of the Router1 interface that connects the company to the Internet. It is the IP address of the Router1 interface that connects the PC1 LAN to Router1.* It is the IP address of Switch1 that connects PC1 to other devices on the same LAN. It is the IP address of the ISP network device located in the cloud.
44. Which two functions are primary functions of a router? (Choose two.)
packet forwarding* microsegmentation domain name resolution path selection* flow control
45. What is the effect of using the Router# copy running-config startup-config command on a router?
The contents of ROM will change. The contents of RAM will change. The contents of NVRAM will change.* The contents of flash will change.
46. What will happen if the default gateway address is incorrectly configured on a host?
The host cannot communicate with other hosts in the local network. The switch will not forward packets initiated by the host. The host will have to use ARP to determine the correct address of the default gateway. The host cannot communicate with hosts in other networks.* A ping from the host to 127.0.0.1 would not be successful.
47. What are two potential network problems that can result from ARP operation? (Choose two.)
Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing. On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.* Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.* Large numbers of ARP request broadcasts could cause the host MAC address table to overflow and prevent the host from communicating on the network. Multiple ARP replies result in the switch MAC address table containing entries that match the MAC addresses of hosts that are connected to the relevant switch port.
48. Open the PT activity. Perform the tasks in the activity instructions and then answer the question. Which interfaces in each router are active and operational?
R1: G0/0 and S0/0/0 R2: G0/0 and S0/0/0
R1: G0/1 and S0/0/1 R2: G0/0 and S0/0/1
R1: G0/0 and S0/0/0 R2: G0/1 and S0/0/0**
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R1: G0/0 and S0/0/1 R2: G0/1 and S0/0/1
49. Which term describes a field in the IPv4 packet header used to identify the next level protocol?
Protocol* destination IPv4 address source IPv4 address TTL
50. Which term describes a field in the IPv4 packet header that contains an 8-bit binary value used to determine the priority of each packet?
differentiated services* destination IPv4 address source IPv4 address protocol
51. Which term describes a field in the IPv4 packet header that contains a 32-bit binary value associated with an interface on the sending device?
source IPv4 address* destination IPv4 address protocol TTL
52. Which term describes a field in the IPv4 packet header used to detect corruption in the IPv4 header?
header checksum* source IPv4 address protocol TTL
53.
RTR1(config)# interface gi0/1 RTR1(config-if)# description Connects to the Marketing LAN RTR1(config-if)# ip address 10.27.15.17 255.255.255.0 RTR1(config-if)# no shutdown RTR1(config-if)# interface gi0/0 RTR1(config-if)# description Connects to the Payroll LAN RTR1(config-if)# ip address 10.27.14.148 255.255.255.0 RTR1(config-if)# no shutdown RTR1(config-if)# interface s0/0/0 RTR1(config-if)# description Connects to the ISP RTR1(config-if)# ip address 10.14.15.254 255.255.255.0 RTR1(config-if)# no shutdown RTR1(config-if)# interface s0/0/1 RTR1(config-if)# description Connects to the Head Office WAN RTR1(config-if)# ip address 203.0.113.39 255.255.255.0 RTR1(config-if)# no shutdown RTR1(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Payroll LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
10.27.14.148* 10.27.14.1 10.14.15.254 203.0.113.39 10.27.15.17
54. Which term describes a field in the IPv4 packet header that contains a unicast, multicast, or broadcast address?
destination IPv4 address* protocol TTL header checksum
55. Which term describes a field in the IPv4 packet header used to limit the lifetime of a packet?
TTL* source IPv4 address protocol header checksum
56. Which term describes a field in the IPv4 packet header that contains a 4-bit binary value set to 0100?
Versión* source IPv4 address protocol TTL
57. Which term describes a field in the IPv4 packet header used to identify the next level protocol?
Protocol* version differentiated services header checksum
58. Which term describes a field in the IPv4 packet header that contains a 4-bit binary value set to 0100?
Versión* differentiated services header checksum TTL
59. What property of ARP causes cached IP-to-MAC mappings to remain in memory longer?
Entries in an ARP table are time-stamped and are purged after the timeout expires.* A static IP-to-MAC address entry can be entered manually into an ARP table. The type field 0x806 appears in the header of the Ethernet frame. The port-to-MAC address table on a switch has the same entries as the ARP table on the switch.
60. What property of ARP allows MAC addresses of frequently used servers to be fixed in the ARP table?
A static IP-to-MAC address entry can be entered manually into an ARP table.* Entries in an ARP table are time-stamped and are purged after the timeout expires. The type field 0x806 appears in the header of the Ethernet frame. The port-to-MAC address table on a switch has the same entries as the ARP table on the switch.
61. What property of ARP allows MAC addresses of frequently used servers to be fixed in the ARP table?
A static IP-to-MAC address entry can be entered manually into an ARP table.* The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame. The source MAC address appears in the header of the Ethernet frame. The port-to-MAC address table on a switch has the same entries as the ARP table on the switch.
62. What property of ARP allows hosts on a LAN to send traffic to remote networks?
Local hosts learn the MAC address of the default gateway.* The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame. The source MAC address appears in the header of the Ethernet frame. The port-to-MAC address table on a switch has the same entries as the ARP table on the switch.
63.
Floor(config)# interface gi0/1 Floor(config-if)# description Connects to the Registrar LAN Floor(config-if)# ip address 192.168.235.234 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface gi0/0 Floor(config-if)# description Connects to the Manager LAN Floor(config-if)# ip address 192.168.234.114 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface s0/0/0 Floor(config-if)# description Connects to the ISP Floor(config-if)# ip address 10.234.235.254 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface s0/0/1 Floor(config-if)# description Connects to the Head Office WAN Floor(config-if)# ip address 203.0.113.3 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Registrar LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
192.168.235.234* 192.168.235.1 10.234.235.254 203.0.113.3 192.168.234.114
64. What property of ARP forces all Ethernet NICs to process an ARP request?
The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.* The source MAC address appears in the header of the Ethernet frame. The type field 0x806 appears in the header of the Ethernet frame. ARP replies are broadcast on the network when a host receives an ARP request.
65. What property of ARP causes a reply only to the source sending an ARP request?
The source MAC address appears in the header of the Ethernet frame.* The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame. The type field 0x806 appears in the header of the Ethernet frame. ARP replies are broadcast on the network when a host receives an ARP request.
66. What property of ARP causes the request to be flooded out all ports of a switch except for the port receiving the ARP request?
The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.* The type field 0x806 appears in the header of the Ethernet frame. Entries in an ARP table are time-stamped and are purged after the timeout expires. ARP replies are broadcast on the network when a host receives an ARP request.
67. What property of ARP causes the NICs receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?
The type field 0x806 appears in the header of the Ethernet frame.* The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame. Entries in an ARP table are time-stamped and are purged after the timeout expires. ARP replies are broadcast on the network when a host receives an ARP request.
68. What property of ARP causes the NICs receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?
The type field 0x806 appears in the header of the Ethernet frame.* The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame. Entries in an ARP table are time-stamped and are purged after the timeout expires. The port-to-MAC address table on a switch has the same entries as the ARP table on the switch.
69.
Main(config)# interface gi0/1 Main(config-if)# description Connects to the Service LAN Main(config-if)# ip address 172.29.157.156 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# interface gi0/0 Main(config-if)# description Connects to the Engineering LAN Main(config-if)# ip address 172.29.156.36 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# interface s0/0/0 Main(config-if)# description Connects to the ISP Main(config-if)# ip address 10.156.157.254 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# interface s0/0/1 Main(config-if)# description Connects to the Head Office WAN Main(config-if)# ip address 198.51.100.177 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Service LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
172.29.157.156* 172.29.157.1 10.156.157.254 198.51.100.177 172.29.156.36
70.
BldgA(config)# interface gi0/1 BldgA(config-if)# description Connects to the Medical LAN BldgA(config-if)# ip address 192.168.191.189 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# interface gi0/0 BldgA(config-if)# description Connects to the Client LAN BldgA(config-if)# ip address 192.168.190.70 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# interface s0/0/0 BldgA(config-if)# description Connects to the ISP BldgA(config-if)# ip address 10.190.191.254 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# interface s0/0/1 BldgA(config-if)# description Connects to the Head Office WAN BldgA(config-if)# ip address 198.51.100.213 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Medical LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
192.168.191.189* 192.168.191.1 10.190.191.254 198.51.100.213 192.168.190.70
71.
Floor(config)# interface gi0/1 Floor(config-if)# description Connects to the Registrar LAN Floor(config-if)# ip address 192.168.225.223 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface gi0/0 Floor(config-if)# description Connects to the Manager LAN Floor(config-if)# ip address 192.168.224.103 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface s0/0/0 Floor(config-if)# description Connects to the ISP Floor(config-if)# ip address 10.224.225.254 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface s0/0/1 Floor(config-if)# description Connects to the Head Office WAN Floor(config-if)# ip address 203.0.113.246 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Registrar LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
192.168.225.223* 192.168.225.1 10.224.225.254 203.0.113.246 192.168.224.103
72.
Floor(config)# interface gi0/1 Floor(config-if)# description Connects to the Registrar LAN Floor(config-if)# ip address 10.118.63.65 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface gi0/0 Floor(config-if)# description Connects to the Manager LAN Floor(config-if)# ip address 10.118.62.196 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface s0/0/0 Floor(config-if)# description Connects to the ISP Floor(config-if)# ip address 10.62.63.254 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# interface s0/0/1 Floor(config-if)# description Connects to the Head Office WAN Floor(config-if)# ip address 209.165.200.87 255.255.255.0 Floor(config-if)# no shutdown Floor(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Manager LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
10.118.62.196* 10.118.62.1 10.62.63.254 209.165.200.87 10.118.63.65
73.
HQ(config)# interface gi0/1 HQ(config-if)# description Connects to the Branch LAN HQ(config-if)# ip address 172.19.99.99 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# interface gi0/0 HQ(config-if)# description Connects to the Store LAN HQ(config-if)# ip address 172.19.98.230 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# interface s0/0/0 HQ(config-if)# description Connects to the ISP HQ(config-if)# ip address 10.98.99.254 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# interface s0/0/1 HQ(config-if)# description Connects to the Head Office WAN HQ(config-if)# ip address 209.165.200.120 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Store LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
172.19.98.230* 172.19.98.1 10.98.99.254 209.165.200.120 172.19.99.99
74.
HQ(config)# interface gi0/1 HQ(config-if)# description Connects to the Branch LAN HQ(config-if)# ip address 172.20.133.132 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# interface gi0/0 HQ(config-if)# description Connects to the Store LAN HQ(config-if)# ip address 172.20.132.13 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# interface s0/0/0 HQ(config-if)# description Connects to the ISP HQ(config-if)# ip address 10.132.133.254 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# interface s0/0/1 HQ(config-if)# description Connects to the Head Office WAN HQ(config-if)# ip address 198.51.100.156 255.255.255.0 HQ(config-if)# no shutdown HQ(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Store LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
172.20.132.13* 172.20.132.1 10.132.133.254 198.51.100.156 172.20.133.132
75.
Main(config)# interface gi0/1 Main(config-if)# description Connects to the Service LAN Main(config-if)# ip address 192.168.167.166 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# interface gi0/0 Main(config-if)# description Connects to the Engineering LAN Main(config-if)# ip address 192.168.166.46 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# interface s0/0/0 Main(config-if)# description Connects to the ISP Main(config-if)# ip address 10.166.167.254 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# interface s0/0/1 Main(config-if)# description Connects to the Head Office WAN Main(config-if)# ip address 198.51.100.189 255.255.255.0 Main(config-if)# no shutdown Main(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Service LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
192.168.167.166* 192.168.167.1 10.166.167.254 198.51.100.189 192.168.166.46
76.
BldgA(config)# interface gi0/1 BldgA(config-if)# description Connects to the Medical LAN BldgA(config-if)# ip address 192.168.201.200 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# interface gi0/0 BldgA(config-if)# description Connects to the Client LAN BldgA(config-if)# ip address 192.168.200.80 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# interface s0/0/0 BldgA(config-if)# description Connects to the ISP BldgA(config-if)# ip address 10.200.201.254 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# interface s0/0/1 BldgA(config-if)# description Connects to the Head Office WAN BldgA(config-if)# ip address 203.0.113.222 255.255.255.0 BldgA(config-if)# no shutdown BldgA(config-if)# end
Refer to the exhibit. A network administrator is connecting a new host to the Medical LAN. The host needs to communicate with remote networks. What IP address would be configured as the default gateway on the new host?
192.168.201.200* 192.168.201.1 10.200.201.254 203.0.113.222 192.168.200.80
77. Open the PT activity. Perform the tasks in the activity instructions and then answer the question.
Which interfaces in each router are active and operational?
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R1: G0/0 and S0/0/1 R2: G0/1 and S0/0/1
R1: G0/1 and S0/0/1 R2: G0/0 and S0/0/1**
R1: G0/0 and S0/0/0 R2: G0/1 and S0/0/0
R1: G0/0 and S0/0/0 R2: G0/0 and S0/0/0
CCNA1 v7 – ITN – Modules 8 – 10: Communicating Between Networks Exam Answers (Additional)
1. Which information is used by routers to forward a data packet toward its destination?
source IP address destination IP address* source data-link address destination data-link address
2. A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?
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The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host. The packet will be sent directly to the destination host.* The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host. The packet will be sent only to the default gateway.
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3. A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What will the router do next?
route the packet out the Gigabit 0/1 interface create a new Layer 2 Ethernet frame to be sent to the destination* look into the ARP cache to determine the destination IP address look into the routing table to determine if the destination network is in the routing table
4. Which IPv4 address can a host use to ping the loopback interface?
126.0.0.1 127.0.0.0 126.0.0.0 127.0.0.1*
5. When a connectionless protocol is in use at a lower layer of the OSI model, how is missing data detected and retransmitted if necessary?
Connectionless acknowledgements are used to request retransmission. Upper-layer connection-oriented protocols keep track of the data received and can request retransmission from the upper-level protocols on the sending host.* Network layer IP protocols manage the communication sessions if connection-oriented transport services are not available. The best-effort delivery process guarantees that all packets that are sent are received.
6. What was the reason for the creation and implementation of IPv6?
to make reading a 32-bit address easier to relieve IPv4 address depletion* to provide more address space in the Internet Names Registry to allow NAT support for private addressing
7. Which statement accurately describes a characteristic of IPv4?
All IPv4 addresses are assignable to hosts. IPv4 has a 32-bit address space.* An IPv4 header has fewer fields than an IPv6 header has. IPv4 natively supports IPsec.
8. Which field in an IPv4 packet header will typically stay the same during its transmission?
Flag Time-to-Live Packet Length Destination Address*
9. When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination?
destination MAC address source IP address destination IP address* source MAC address
10. Which field in an IPv6 packet is used by the router to determine if a packet has expired and should be dropped?
TTL Hop Limit* Address Unreachable No Route to Destination
11. Which command can be used on a Windows host to display the routing table?
netstat -s show ip route netstat -r* tracert
12. What information is added during encapsulation at OSI Layer 3?
source and destination MAC source and destination application protocol source and destination port number source and destination IP address*
13. How does the network layer use the MTU value?
The network layer depends on the higher level layers to determine the MTU. The network layer depends on the data link layer to set the MTU, and adjusts the speed of transmission to accommodate it. The MTU is passed to the network layer by the data link layer.* To increase speed of delivery, the network layer ignores the MTU.
14. Which characteristic describes an IPv6 enhancement over IPv4?
IPv6 addresses are based on 128-bit flat addressing as opposed to IPv4 which is based on 32-bit hierarchical addressing. The IPv6 header is simpler than the IPv4 header is, which improves packet handling.* Both IPv4 and IPv6 support authentication, but only IPv6 supports privacy capabilities. The IPv6 address space is four times bigger than the IPv4 address space.
15. When an IP packet is sent to a host on a remote network, what information is provided by ARP?
the IP address of the destination host the IP address of the default gateway the MAC address of the router interface closest to the sending host* the MAC address of the switch port that connects to the sending host
16. How does the ARP process use an IP address?
to determine the MAC address of the remote destination host to determine the MAC address of a device on the same network* to determine the amount of time a packet takes when traveling from source to destination to determine the network number based on the number of bits in the IP address
17. The ARP table in a switch maps which two types of address together?
Layer 3 address to a Layer 2 address* Layer 3 address to a Layer 4 address Layer 4 address to a Layer 2 address Layer 2 address to a Layer 4 address
18. What is one function of the ARP protocol?
obtaining an IPv4 address automatically mapping a domain name to its IP address resolving an IPv4 address to a MAC address* maintaining a table of domain names with their resolved IP addresses
19. Which router component holds the routing table, ARP cache, and running configuration file?
RAM* Flash NVRAM ROM
20. What type of information is contained in an ARP table?
switch ports associated with destination MAC addresses domain name to IP address mappings routes to reach destination networks IP address to MAC address mappings*
21. A PC is configured to obtain an IP address automatically from network 192.168.1.0/24. The network administrator issues the arp -a command and notices an entry of 192.168.1.255 ff-ff-ff-ff-ff-ff. Which statement describes this entry?
This is a static map entry.* This is a dynamic map entry. This entry refers to the PC itself. This entry maps to the default gateway.
22. A cybersecurity analyst believes an attacker is spoofing the MAC address of the default gateway to perform a man-in-the-middle attack. Which command should the analyst use to view the MAC address a host is using to reach the default gateway?
ipconfig /all route print netstat -r arp -a*
23. What is a function of ARP?
resolving MAC addresses to IPv4 addresses resolving port addresses to MAC addresses resolving MAC addresses to port addresses resolving IPv4 addresses to MAC addresses*
24. What is the purpose of ARP in an IPv4 network?
to forward data onward based on the destination IP address to obtain a specific MAC address when an IP address is known* to forward data onward based on the destination MAC address. to build the MAC address table in a switch from the information that is gathered
25. Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?
It drops the frame. It sends the frame to all ports except the port on which it received the frame.* It sends the frame to all ports that are registered to forward broadcasts. It sends the frame to all ports.
26. Which destination address is used in an ARP request frame?
0.0.0.0 255.255.255.255 FFFF.FFFF.FFFF* 127.0.0.1 01-00-5E-00-AA-23
27. What addresses are mapped by ARP?
destination MAC address to a destination IPv4 address* destination IPv4 address to the source MAC address destination IPv4 address to the destination host name destination MAC address to the source IPv4 address
28. What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC table?
It initiates an ARP request. It broadcasts the frame out of all ports on the switch. It notifies the sending host that the frame cannot be delivered. It forwards the frame out of all ports except for the port at which the frame was received.*
29. Which two ICMPv6 messages are used during the Ethernet MAC address resolution process? (Choose two.)
router solicitation router advertisement neighbor solicitation* neighbor advertisement* echo request
30. A router boots and enters setup mode. What is the reason for this?
The IOS image is corrupt. Cisco IOS is missing from flash memory. The configuration file is missing from NVRAM.* The POST process has detected hardware failure.
31. Which command is used to encrypt all passwords in a router configuration file?
Router_A (config) # enable secret Router_A (config) # service password-encryption* Router_A (config) # enable password Router_A (config) # encrypt password
32. Company policy requires using the most secure method to safeguard access to the privileged exec and configuration mode on the routers. The privileged exec password is trustknow1. Which of the following router commands achieves the goal of providing the highest level of security?
secret password trustknow1 enable password trustknow1 service password-encryption enable secret trustknow1*
33. What will be the response from the router after the command, “router(config)# hostname portsmouth” is entered?
portsmouth# portsmouth(config)#* invalid input detected router(config-host)# hostname = portsmouth portsmouth# ? command not recognized router(config)#
34. An administrator is configuring a new router to permit out-of-band management access. Which set of commands will allow the required login using a password of cisco?
Router(config)# line vty 0 4 Router(config-line)# password manage Router(config-line)# exit Router(config)# enable password cisco
Router(config)# line vty 0 4 Router(config-line)# password cisco Router(config-line)# login
Router(config)# line console 0 Router(config-line)# password cisco Router(config-line)# login***
Router(config)# line console 0 Router(config-line)# password cisco Router(config-line)# exit Router(config)# service password-encryption
35. Which command can be used on a Cisco router to display all interfaces, the IPv4 address assigned, and the current status?
show ip interface brief* ping show ip route show interface fa0/1
36. Which CLI mode allows users to access all device commands, such as those used for configuration, management, and troubleshooting?
user EXEC mode privileged EXEC mode* global configuration mode interface configuration mode
37. What is the purpose of the startup configuration file on a Cisco router?
to facilitate the basic operation of the hardware components of a device to contain the commands that are used to initially configure a router on startup* to contain the configuration commands that the router IOS is currently using to provide a limited backup version of the IOS, in case the router cannot load the full featured IOS
38. Which characteristic describes the default gateway of a host computer?
the logical address of the router interface on the same network as the host computer* the physical address of the switch interface connected to the host computer the physical address of the router interface on the same network as the host computer the logical address assigned to the switch interface connected to the router
39. What is the purpose of the banner motd command?
It configures a message that will identify printed documents to LAN users. It is a way that routers communicate the status of their links with one another. It provides an easy way of communicating with any user attached to a router’s LANs. It provides a way to make announcements to those who log in to a router.*
40. A technician is configuring a router to allow for all forms of management access. As part of each different type of access, the technician is trying to type the command login. Which configuration mode should be entered to do this task?
user executive mode global configuration mode any line configuration mode* privileged EXEC mode
41. What is stored in the NVRAM of a Cisco router?
the Cisco IOS the running configuration the bootup instructions the startup configuration*
42. Which statement regarding the service password-encryption command is true?
It is configured in privileged EXEC mode. It encrypts only line mode passwords. As soon as the service password-encryption command is entered, all currently set passwords formerly displayed in plain text are encrypted.* To see the passwords encrypted by the service password-encryption command in plain text, issue the no service password-encryption command.
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