Computer Networking
The physical layer, in reference to the OSI model, defines

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

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Computer Networking
ARP (Address Resolution Protocol) is

a protocol that handles error and control messages
a TCP/IP high level protocol for transferring files from one machine to another
None of these
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

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