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

the ratio of the number of data units in error to the total number of data units
a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
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
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Flood the network with the frame
Add the destination to the MAC address table and then forward the frame
Add the source address and port to the MAC address table and forward the frame out the destination port
Discard it and send an error message back to the originating host

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Computer Networking
Bandlimited signal is

All of these
simultaneous transmission of data to a number of stations
None of these
a signal all of whose energy is contained within a finite frequency range
transmission of signals without modulation

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Computer Networking
You have created a named access list called Blocksales. Which of the following is a valid command for applying this to packets trying to enter interface s0 of your router?

(config)# ip access-group 110 in
(config-if)# blocksales ip access-list in
(config-if)# ip access-group Blocksales in
(config-if)# ip access-group 110 in

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