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

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

ANSWER DOWNLOAD EXAMIANS APP

Computer Networking
X.21 is

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

ANSWER DOWNLOAD EXAMIANS APP