Question

assuming fifo service, indicate the time at which packets 2 through 12 each leave the queue. for each packet, what is the delay between its arrival and the beginning of the slot in which it is transmitted?

Answer 1

In the parlance of networking, in FIFO service, 2.916 is the average of this delay over all 12 packets.

What is FIFO in Networking?

FIFO is an abbreviation for First In, First Out. FIFO is a way of organizing, processing, and modifying a computing system's data structure. It's a sort of data management that prioritizes the processes that arrive first, which means it will delete or attach the components that came first.

FIFO is First In First Out, hence, the packets will be worked in order of their arrival. The order of arrival of the packets is 1 2 3 4 6 5 7 8 9 10 11 12 so the packets will be serviced in this order.

Packet Index Arrive Queue Time Leave Queue Time Delay

1                      0                                 1                             1

2                       0                         2                              2

3                       1                                 3                               2

4                       1                                 4                               3

5                       3                         6                              3

6                        2                        5                               3

7                        3                        7                               4

8                        5                        8                               3

9                        5                        9                              4

10                        7                        10                                  3

11                       8                       11                             3

12                       8                     12                             4

Average Delay of 12 Packets 2.916

Average delay = (1+2+2+3+3+3+4+3+4+3+3+4)/12 = 32/12 = 2.916

In Priority Service whenever we have a packet with odd index we will service it first.

Learn more about FIFO:
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