Computer Networking
ICMP (Internet Control Message Protocol) is

a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
a TCP/IP high level protocol for transferring files from one machine to another
None of these
a protocol used to monitor computers
a protocol that handles error and control messages

ANSWER DOWNLOAD EXAMIANS APP

Computer Networking
X.21 is

network access standard for connecting stations to a circuit-switched network
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

ANSWER DOWNLOAD EXAMIANS APP