Can someone here explain exactly what a supernet is? I know how to sub-subnet, but after the exam I am a little confused as to what they classify as a supernet.

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Aken,
Supernetting is the same as summarization

JB

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mmmmmmmmmm man i don't remember exactly , in supernetting you can use more hosts then 254 hosts e.g if you want more the 254 hosts in a subnet so what you can do is take 2 ip addresses combine their bits or do some subnetting or something like that so you can have more then 254 hosts on that subnet . Aken some members will explain better then me so just wait for their reply

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In a nutshell, supernetting is route aggregation (have I spelt that right?? ). Used by ISP's and so forth to cut down the number of route table entries on their backbone routers. You may know it as CIDR???

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OMG...what am I doing in the CCIE Forum?...I am not worthy

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Yep, Route aggregation, route summarization, and supernetting are basically the same thing.

Supernetting is logically the opposite of subnetting.

When subnetting you borrow bits from the host id, and designate them as the network id.
When supernetting, you borrow bits from the network id, and designate them as the host id.

Get it?

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say an ISP allocates you a 8 class C network space. to you it would be
202.1.1.0/24
202.1.2.0/24
202.1.3.0/24
and so on through 202.1.8.0/24
On their router it would look like this
202.1.1.0/21
That help?

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Mmm, I'm confused.

If an ISP allocated 8 class C addresses then they would be

202.1.0.0/24
...
202.1.7.0/24

On the router this would be summerised to
202.1.0.0/21

Take a look at my PHP subnet calculator

http://ccna.exampointers.com/subnet.htm

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quote:

---

Originally posted by chumley
Mmm, I'm confused.

If an ISP allocated 8 class C addresses then they would be

202.1.0.0/24
...
202.1.7.0/24

On the router this would be summerised to
202.1.0.0/21

Take a look at my PHP subnet calculator

http://ccna.exampointers.com/subnet.htm

---

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www.chodan.com
Rural Development in Eastern Ky.
www.centertech.com
"It is our decisions that show us what we truly are in life, not our abilities."

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Er...what are you confused about?...with your skills you should be able to do it in your sleep...

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