Computer Networking
RS-449/442-A/423-A is

a check bit appended to an array of binary digits to make the sum of the all the binary digits
a set of physical layer standards developed by EIA and intended to replace RS-232-
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

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Computer Networking
A T-switch is used to

transmit characters one at a time
echo every character that is received
rearrange the connections between computing equipment
None of these
control how messages are passed between computers

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Computer Networking
Contention is

a collection of interconnected functional units that provides a data communications service among stations attached to the network
a continuous frequency capable of being modulated or impressed with a second signal
None of these
One or more conductors that serve as a common connection for a related group of devices
the condition when two or more stations attempt to use the same channel at the same time

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Computer Networking
Which two of the following are true regarding the distance-vector and link-state routing protocols?1. Link state sends its complete routing table out all active interfaces on periodic time intervals.2. Distance vector sends its complete routing table out all active interfaces on periodic time intervals.3. Link state sends updates containing the state of its own links to all routers in the internetwork.4. Distance vector sends updates containing the state of its own links to all routers in the internetwork.

None of these
3 only
2 and 3 only
1 only

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