Which protocols are TCP/IP application layer protocols? (choose all that apply)

a. IP

b. TCP

c. UDP

d. FTP

Option (b) and Option (c) is the correct answer for the given question.

Explanation:

TCP stands for transmission control protocol, In the TCP protocol firstly it maintains the connection between the sender and the receiver. The receiver always gives an acknowledgment to the sender when it receives the information that's why TCP is reliable protocol it is found in TCP/IP application layer protocols

UDP stands for user datagram protocol, In the UDP protocol, it does not maintain the connection between the sender and the receiver. The receiver does not give any acknowledgment to the sender that why UDP is not a reliable protocol. it is also found in the TCP/IP application layer protocols

In the option (a) IP is found in the network layer that why this option is incorrect. In the option (d) FTP is found in the application layer thats why this option is incorrect.

Hence TCP and UDP are TCP/IP application layer protocols

FTP telnet most widely implement of TCP/IP application layer you will work with many others as both a user and a system administrator. Some other commonly used TCP/IP applications are: Domain Name Service (DNS).