The purpose of RS232C is to

establish a standard interface between terminals and modems. establish an interface between local and long distance lines convert serial to parallel data. convert digital data to analog data.

How many major components telephone network is made of ?

3 4 2 8

Which part of the computer is used for calculating and comparing?

ALU Control unit Disk unit Modem

Which layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver?

Network Physical Data Link Transport

Error detection at the data link level is achieved by?

Cyclic Redundancy codes Hamming codes Bit stuffing Equalization