Computer Networking
What is the main difference between DDCMP and SDLG?

DDCMP has a message header
SDLC does not use CRC
DDCMP does not need special hardware to final the beginning of a message.
None of these
SDLC has a IP address

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

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