Computer Networks - Data Communication & Network Security


What uses a physical star topology ?

A. 10 base 5
B. 10 base 2
C. 10 base T
D. None of these

Option: C

Explanation :
10 base T cable is also called as Twisted-pair-
Ethernet. A star topology LAN using unshared
twisted pair instead of coaxial cable


 The monitor station in what standard ensures that one and only one token is circulating ?

A. 802.3
B. 802.5
C. Both (a) and (b)
D. All of these

Option: B

Explanation :
Here 802.3 is Ethernet, it uses CSMA/CD. But 802.5 is Token ring. It will have only one token in circulation. These are IEEE standards but FDDI is ANSI standard


What can happen at a Token Ring station 

A. Examination of the destination address
B. Regeneration of the frame
C. Passing of the frame to the next station
D. All of these

Option: D

Explanation :
In a token ring each station with capture the token and checks the destination address if it is
addressed to any other station then the frame
will be regenerated and passed to the next


In Token Ring, when a frame reaches its destination station, then

A. message is copied
B. four bits in the packet are changed
C. message is taken of the ring and replaced by the token
D. both (a) and (b)

Option: D

Explanation :
In Token ring, when a frame reaches its destination station, the entire message is copied and four bits in the packet are changed.


Which of the following is not a transceiver function?

A. Transmission and receipt of data
B. Checking of line voltages
C. Addition and subtraction of headers
D. Collision detection

Option: C

Explanation :
Transceiver is an acronym for transmission receiver, which receives data after checking the line voltage, hence it can't add headers.

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