Subnetting Difficulty

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Taking the following example shown in the first image, why has my teacher has assigned in the solution (image 2) for network one (N1): 7+2 hosts?

Shouldn't it be 6+2 since the number of hosts in that network is 6 and the first and the last (broadcast) can't be assigned?

He has done the same things until N6 and N7 where he assigned 2+2 for the link.

Is this correct and there should be something that I need to know?

user3642381

Posted 2015-06-15T17:23:04.977

Reputation: 3

2Did you ask your teacher for an explanation? What was his answer? – DavidPostill – 2015-06-15T17:30:18.403

The courses are over and unfortunately he's not replying at my email. – user3642381 – 2015-06-15T18:47:11.030

My guess is that the router deserves an ip address too. #hosts + router + boardcasts = #hosts + 3. This explains the given solution and is coherent with picture 1. – agtoever – 2015-06-15T20:13:12.487

Answers

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Router R1's interface to network N1 requires an IP address in network N1's range. That is the 7th IP address. You can see the same one-more-than-listed on N2, N3, and N4.

N6 has two hosts -- R5 and R3. Same for N7.

hymie

Posted 2015-06-15T17:23:04.977

Reputation: 1 011

Asked: 2015-06-15T17:23:04.977

Viewed: 97 times

Active: 2015-06-15T19:17:22.820