Computer Networking
Which of the following summation operations is performed on the bits to check an error-detecting code?

Coder-decoder
Checksum
Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions
Attenuation
Codec

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Computer Networking
Two connected routers are configured with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?

They will all load-balance.
The existing routing table entry will be deleted from the routing table and all routers will exchange routing updates to reach convergence.
The updated information will be added to the existing routing table.
The updated information will replace the existing routing table entry.
The update will be ignored and no further action will occur.

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Computer Networking
X.21 is

a method of determining which device has access to the transmission medium at any time
a method access control technique for multiple-access transmission media
None of these
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO

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