Computer Networking
Which of the following best illustrates the default subnet mask for a class A,B, and C Network?

255.0.0.0, 255.255.0.0, 255.255.255.0
255.255.255.0, 255.255.0.0, 255.0.0.0
None of these
255.255.0.0, 255.255.255.0, 255.255.255.255
0.0.0.0, 0.0.0.1, 0.0.1.1

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Computer Networking
The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are

to assign address to private network DTEs
adequate cost control mechanisms for administration of the private networks
A and B both
universal accessibility for private network Data Terminal Equipment (DTE)
None of these

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

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
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-
the ratio of the number of data units in error to the total number of data units

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

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

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