Computer Networking
The network layer, in reference to the OSI model, provide

the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device
All of these
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received

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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 protocol used to monitor computers
None of these
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address

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