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Q.

LEO satellites are normally below an altitude of ________ km.

A

1000

B

2000

C

3000

D

none of the above

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MCQ

1.

SONET has defined a hierarchy of signals called ________

A

STSs

B

STMs

C

either (a) or (b)

D

neither (a) nor (b)

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2.

. _________ allow insertion and extraction of signals

A

regenerators

B

ADMs

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STS multiplexer/demultiplexers

D

none of the above

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________ is actually a multiport repeater. It is normally used to create connections between stations in a physical star topology

A

An active hub

B

A passive hub

C

either (a) or (b)

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neither (a) nor (b)

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The AAL is divided into _______ sublayers

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two

B

three

C

four

D

none of the above

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5.

The _______Protocol has both flow control and error control

A

Stop-and-Wait

B

Go-Back-N ARQ

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Selective-Repeat ARQ

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both (b) and (c)

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