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

the virtual circuit interface to packet-switched service
None of these
the interface between the X.25 network and packet mode device
All 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
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
None of these
a very common bit-oriented data link protocol issued by ISO
a method access control technique for multiple-access transmission media

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Computer Networking
If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

The highest IP address of any logical interface
The lowest IP address of any logical interface
The lowest IP address of any physical interface
The highest IP address of any physical interface

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