UGC NET CSE | June 2016 | Part 2 | Question: 27

Question

In a fully connected mesh network with 10 computers, total ___ number of cables are required and ____ number od ports are required for each device

• A. 40, 9
• B. 45, 10
• C. 45, 9
• D. 50, 10

Answer 1

In a fully connected mesh network with 10 computers, total 45 number of cables are required and 10 number od ports are required for each device

Since each two host need a cable so n(n-1)/2 cabels needed.

and n port are used.

B is answer

Comments

number of ports needed is 9 isn't it? each device need to connect with 9 other devices. so it needs 9 ports

Answer 2

CABLES =N(N-1)/2= 45

PORT= N-1=9

 

ANS 3..

Answer 3

Ans: C

ref: https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwj5pJ2a6KHWAhUBp48KHYL_BQUQFgg_MAU&url=http%3A%2F%2Futminers.utep.edu%2Fmkesh%2Fch82.htm&usg=AFQjCNEkWYBesXMzd1pwprtGagdr94POmg

Answer 4

Since each two host need a cable so n(n-1)/2 cabels needed and n – 1 number of ports are required.
i.e. 10(10 – 1) / 2 = 5 * 9 = 45 cables.
9 number of ports are required for each device.
So, option (C) is correct.