VLSM example in Odom's ICND2 book...

Maybe someone can help me understand this because as far as I can see this would be a typo wouldn't it? He's adding a subnet with /23 prefix to figure 5-2(pg205) and in table 5-4 where he calculates all the possible subnets he can use he says the fifth subnet will work with range 172.16.8.1-172.16.9.254.

The serial links between between R1/R2 and R1/R3 are using 172.16.9.0/30 and 172.16.9.4/30 subnets.

Am I missing something here?

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Stuppored

i had the same problem... check out CBT Nugget video for CCNA... they explain VLSM simple as pie. Almost positive torrents got it.

spartangtr

Stuppored wrote: »

i had the same problem... check out CBT Nugget video for CCNA... they explain VLSM simple as pie. Almost positive torrents got it.

I watched that nugget and I get the idea behind VLSM. It's just that those serial link subnets overlap with the subnet he said will work. Why would that be the right answer?

notgoing2fail

spartangtr wrote: »

Maybe someone can help me understand this because as far as I can see this would be a typo wouldn't it? He's adding a subnet with /23 prefix to figure 5-2(pg205) and in table 5-4 where he calculates all the possible subnets he can use he says the fifth subnet will work with range 172.16.8.1-172.16.9.254.

The serial links between between R1/R2 and R1/R3 are using 172.16.9.0/30 and 172.16.9.4/30 subnets.

Am I missing something here?

Hey there,

You're comparing the old subnet that he used in 5-2 with the newly created one in 5-4. The old masks don't work anymore, he's creating a brand new batch of /23 all around for each subnet....