Computer Networking
Parity bit is

a check bit appended to an array of binary digits to make the sum of all the binary digits.
None of these
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
the ratio of the number of data units in error to the total number of data units
an error-detecting code based on a summation operation performed on the bits to be checked.

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Computer Networking
Bandlimited signal is

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

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Computer Networking
Which of the following are benefits of VLANs?1. They increase the size of collision domains.2. They allow logical grouping of users by function.3. They can enhance network security.4. They increase the size of broadcast domains while decreasing the number of collision domains.5. They simplify switch administration.6. They increase the number of broadcast domains while decreasing the size of the broadcast domains.

2, 3 and 6
1 and 5
2 and 4
1, 3 and 5

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Computer Networking
Messages from one computer terminal can be sent to another by using data networks. The message to be sent is converted to an electronic digital signal, transmitted via a cable, telephone or satellite and then converted back again at the receiving end. What is this system of sending messages called?

Electronic mail
Electronic newspaper
None of these
Global network
Paperless office

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