Discussion
Which of the following are TCP/IP protocols used at the Application layer of the OSI model?
1.IP
2.TCP
3.Telnet
4.FTP
5.TFTP
Answer: C
Correct answer: 3, 4 and 5
Telnet, FTP and TFTP are all application layer protocols. IP is at the Internet layer and TCP at the Host-to-Host layer, so neither belongs at the Application layer - they are what the application protocols run over. Note that TFTP counts here despite using UDP: the transport it chooses does not change the layer it occupies.
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