Computer Networking
Parity bit is

a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of all the binary digits.
an error-detecting code based on a summation operation performed on the bits to be checked.
the ratio of the number of data units in error to the total number of data units
None of these

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

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

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

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Computer Networking
Error rate is

None of these
the ratio of the number of data units in error to the total number of data units
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of all the binary digits.
an error-detecting code based on a summation operation performed on the bits to be checked.

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