### Thursday, December 27, 2012

# GATE-Computer Networks - Token Ring

**Previous GATE questions with solutions on Computer Networks (Token Ring) - CS/IT**

**GATE - 2007****1. In a token ring network the transmission speed is 10**

^{7 }bps and the propagation speed is 200 metres/ms. The 1-bit delay in this network is equivalent to:

(a) 500 metres of cable (b) 200 metres of cable

(c) 20 metres of cable (d) 50 metres of cable

Ans: option (c)

Explanation:

Transmission delay for 1 bit t = 1/(10

^{7}) = 0.1 micro seconds.

Given that propagation speed = 200 meters/ms

That means, 200 meters can be traveled in 1 micro second.

Hence in 0.1 micro seconds, 20 meters can be traveled.

OR

1 Bit Delay = 1/B = 1/(10

^{7}) = 0.1 micro seconds.

Given that propagation speed = 200 meters/ms

That means, 200 meters can be traveled in 1 micro second.

Hence in 0.1 micro seconds, 20 meters can be traveled.

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