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

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

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Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

can send or receive data one at a time
can do one way data transmission only
can receive and send data simultaneously
None of these
cannot talk at once

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