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

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

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Computer Networking
You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?

The MAC forward/filter table will not update on the switch.
The switches will automatically load-balance between the two links.
Broadcast storms will occur on the switched network.
The routing tables on the switches will not update.

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Computer Networking
X.21 is

a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
None of these
a method of determining which device has access to the transmission medium at any time

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