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Discontiguous network question

wave

I just struck the following practice test question: "A network is referred to as discontiguous if it has been subnetted but the subnets are not physically accessible to each other via a router."

The correct answer is True, I answered False.

If you have three routers, A B and C all using subnets of the 10.0.0.0/8 network, even though the network is subnetted and the 10.1.0.0/16 subnet might be on the other side of router C (as opposed to a connected route) wouldn't the network still be contiguous?

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Comments

headshot

I believe what you described is contiguous. Because it is not being divided by another major class A net. They are all subnets of class a 10.0.0.0 network.

Why Doesn't RIP or IGRP Support Discontiguous Networks? - Cisco Systems

headshot

btw which book did you get that from?

wave

headshot wrote: »

btw which book did you get that from?

It was a question in the Cisco Press CCNA Flashcard exam that comes with the book. It uses the Boson exam engine but the questions are created by Cisco Press. I have found tons of incorrect questions and typos, you kind of have to pick through the questions to find decent ones. I don't know why they bothered creating that test at all seeing as they wrote it with so little care.On another note, I love the ex sim max exams by Boson.

headshot

headshot wrote: »

I believe what you described is contiguous. Because it is not being divided by another major class A net. They are all subnets of class a 10.0.0.0 network.

Why Doesn't RIP or IGRP Support Discontiguous Networks? - Cisco Systems

It could actually be divided by any major network (or subnet of), doesn't necessarily have to be class A.

wave

Exactly. 192.168.1.0 with next to it 192.168.5.0 and 192.168.9.0 at the far end would be discontiguous because the network boundary is broken.

But 192.168.1.0/26 and 192.168.1.64/26 and 192.168.1.128/26 would be contiguous.