UGC NET PAPER 2 June 2019 Question 83 (Shift-I)

Question 83

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83. You are designed a link layer protocol for a link with bandwidth of 1 Gbps (109 bits/second) over a fiber link with length of 800 km. Assume the speed of light in this medium is 200000 km/second. What is the propagation delay in this link?

1. 1. 1 millisecond
2. 2. 2 millisecond
3. 3. 3 millisecond
4. 4. 4 millisecond

Answer : 4. 4 millisecond

Explanation Question 83

Given data:
Fiber link length = distance = 800 km.
Speed of light in this medium = velocity = 200000 km/second
and we know that 1 sec is equel to 1000 milliseconds

Solution:
Propagation delay : Time taken by the first bit to travel from sender to receiver end of the link.

Propagation delay = distance/transmission speed
Propagation delay
= 800km / ( 200000km /sec)
= ( 800 / 200000) sec
= ( 800 / 200 ) milliseconds
= 4 ms

So, option 4 is correct answer

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