Computer Networking
Start and stop bits are used in serial communication for

Synchronization
Slowing down the communication
Error detection
Error correction

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Computer Networking
ICMP (Internet Control Message Protocol) is

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

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