VLSM example in Odom's ICND2 book...

spartangtrspartangtr Member Posts: 111
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?

Comments

  • StupporedStuppored Member Posts: 150
    i had the same problem... check out CBT Nugget video for CCNA... they explain VLSM simple as pie. Almost positive torrents got it.
  • spartangtrspartangtr Member Posts: 111
    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?
  • notgoing2failnotgoing2fail Member Posts: 1,138
    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....
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