Computer Networking
Which of the following are TCP/IP protocols used at the Application layer of the OSI model?1. IP2. TCP3. Telnet4. FTP5. TFTP

All of these
3, 4 and 5
1 and 3
1, 3 and 5

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Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

The administrator is pinging from the interface.
No cable is attached.
The administrator has the interface shut down.
The keepalives are different times.

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