Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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Computer Networking
ICMP (Internet Control Message Protocol) is

a protocol used to monitor computers
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 that handles error and control messages

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