Classical

Computer Networks - Data Communication & Network Security

21:  

 The station-to-hub distance in which of the following is 2000 meters ?

A. 100 Base-TX
B. 100 Base-FX
C. 100 Base - T4
D. 100 Base - T1
 
 

Option: B

Explanation :
The distance between station-to-hub in 100
Base - TX is 100 meters. But in 100-Base-FX
design. The distance between station-to-hub is
2000 meters.


22:  

Ether LAN uses

A. polar encoding
B. diferential manchester encoding
C. manchester encoding
D. NRZ
 
 

Option: C

Explanation :
. Base band Ethernet LAN uses Manchester encoding


23:  

Which of the given below  houses the switches in Token Ring ?

A. NIC
B. MAU
C. Nine-pin connector
D. Transceiver
 
 

Option: B

Explanation :
MAU (Multistation Access Unit) :
Individual automatic switches are combined into
a hub called a multistation access unit (MAU)
and MAU can support up to eight stations. Token ring uses the MAU.


24:  

 Which of the following uses an 8B/6T encoding scheme?

A. 100 Base-TX
B. 100 Base-FX
C. 100 Base-T4
D. 100 Base-T1
 
 

Option: C

Explanation :
100 base-T4 requires four pairs of unshielded
twisted pair cable to reduce baud rate of
transmission (number of signal changes) 8B/6T
(eight binary / six ternary) is used in which each block of eight bits is transformed into six bauds
of three voltages levels.


25:  

IBM's Token-Ring network uses

A. adaptive routing
B. source routing
C. alternative routing
D. spanned tree routing
 
 

Option: A

Explanation :




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