Computer Networking
The packets switching concept was first proposed

All of these
in the late 1980s for the Defense Ministry of US.
in the late 1950s for Defense Ministry of US
None of these
in the early 1960s for military communication systems, mainly to handle speech

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Computer Networking
You type debug ip rip on your router console and see that 172.16.10.0 is being advertised to you with a metric of 16. What does this mean?

They will all load-balance.
The route is 16 hops away.
The route is queued at 16 messages a second.
The route has a delay of 16 microseconds.
The route is inaccessible.

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Computer Networking
RS-449/442-A/423-A 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 set of physical layer standards developed by EIA and intended to replace RS-232-
the ratio of the number of data units in error to the total number of data units
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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