What three application layer protocols are part of the TCP/IP protocol suite? (Choose three.)
- DNS
- ARP.
- NAT
- DHCP.
- FTP
- PPP.
Answer: There are many applications layers protocol but in the given options DHCP, FTP and DNS are the protocols that are part of the TCP/IP protocol suite.
In this topic, we have explained the protocols which are present at the application layer in the OSI model. those who want to know will stick to the topic to the end to get the details.
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Application layer protocol
The protocols which work under the application layer are categorized into two forms such as:
- The protocol for users i.e., eMail.
- The protocols assist the user’s protocols such as the DNS (Domain Name System).
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Some of them are discussed in the following section:
Domain Name System
It is the model for the client-server and is also known as the DNS. For the transport layer, it acts as the user datagram protocol which helps in communication. A hierarchical naming scheme is used by it.it is configured with FQDN and with other protocols of the internet. An FQDN requests the DNS and the response is given with the IP address mapped. the port for the DNS is 53.
SMTP (Simple Mail Transfer Protocol)
The electronic mail among users is transferred with the help of these protocols, and the client-server software is used in this transfer. The user types the message in the email then it contains it until the internet is not connected. When we submit the email then it is handled by the message transfer agent which is also present in the client-server software. The protocol is also used to transfer the email to another transfer agent. As the SMTP is used to only send the message the server uses it to both send and receive the email. The port for the SMTP is 25 and 587.
File transfer protocols
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It is the most common protocol which is used to send the file over the internet. The TCP/IP is used by the FTP and the port for it is 21. It also works on the client-server model the client request for the file while the response is given by the servers to the client. Port 20 of TCP is used by FTP for the exchange of information.
When the client requests a file, the server gains the request and opens the TCP connection, and transfers the file toward the client back. When the transfer completes the connection terminates and opens with another request.
DHCP protocol
Dynamic host configuration protocol is the protocol for the management of the network in the application layer of the OSI model.it helps to give the IP address to the devices so that they can communicate with the help of the given IP addresses. The main goal is to give the specific and unique IP address to the nodes or hosts. The protocol gives the subnet mask, router address, and the DNS server as well. The protocol has numerous IP addresses that’s why each device has its address which is different from another device.
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