Summarize routes

txn41655

hi, I am new. Could any one tell me if is possible to summarize the following routes? :

172.30.0.0/26
172.30.0.64/26
172.30.0.128/26
172.30.0.192/26


172.20.0.0/27
172.20.0.32/27
172.20.0.64/27
172.20.0.96/27

dontstop

txn41655 wrote: »

hi, I am new. Could any one tell me if is possible to summarize the following routes? :

172.30.0.0/26
172.30.0.64/26
172.30.0.128/26
172.30.0.192/26

Answer: 172.30.0.0/24

/25 wouldn't work because that mask would give you ranges 172.30.0.0 - 127 or 172.30.0.128 - 255

txn41655 wrote: »

172.20.0.0/27
172.20.0.32/27
172.20.0.64/27
172.20.0.96/27

Answer: 172.20.0.0/25

/26 wouldn't work because because that mask gives you 172.20.0.0 - 63, 64 - 127, 128 - 191, 192 - 255

txn41655

thanks, could you tell me in which case we cannot summarize?

dontstop

I'm not sure I follow. Are you talking about in regards to the above question or in general? Is this homework?

txn41655

thanks i am studying, never mind my last post....i did not read what you edited after...

txn41655

dontstop wrote: »

Answer: 172.30.0.0/24

/25 wouldn't work because that mask would give you ranges 172.30.0.0 - 127 or 172.30.0.128 - 255



Answer: 172.20.0.0/25

/26 wouldn't work because because that mask gives you 172.20.0.0 - 63, 64 - 127, 128 - 191, 192 - 255

If we summary 172.30.0.0/24 this would include network and broadcast addresses. Will the router route correctly ? what if someone pings the network address or the broadcast address? thanks.

dontstop

Think about how routes are normally stored in a router routing table. Think of 192.168.0.0/24 for instance, it's the Class C network 192.168.0.0/24, the route includes all addresses in the subnet.