Examine the exhibit. Which addresses listed will be summarized by R2 into area 0? (Choose all that apply.)

Last Updated on August 1, 2021 by Admin 1

Examine the exhibit.

300-410 Part 07 Q05 084
300-410 Part 07 Q05 084

Router R2 has been configured with the following OSPF router command:

area 1 range

Which addresses listed will be summarized by R2 into area 0? (Choose all that apply.)

The command area 1 range130.31.96.0 is used to summarize the IP network addresses from to in area 1. Addresses and are both in that range of network addresses.

To determine if an address is a part of a summary, put the summary address and summary mask in binary format. Do the same with the address and the summary mask you are examining, as shown below:      10000010.00001111.01100000.00000000     10000010.00001111.01110000.00000000   11111111.11111111.11100000.00000000

If the address you are testing and the summary address agree to the point where the mask stops, then the test address is part of the summary. In this case, they agree through the 27th bit, so this address is a part of the summary. The same is true for the address.

In OSPF, you can only configure summarization on the border routers. The summaries need to be of routes within a single area. You summarize the routes of an area so that routers in another area do not see the individual networks, just the summary. The correct command is:

area area id range ip-address mask

The area id parameter is the number of the area whose networks are being summarized. For example, in the network shown in the exhibit, to summarize the networks within area 1 to you would configure router R2 with the command area 1 range This would not affect the routing tables of the routers within area 1, but instead make the routing tables of areas 0 and 2 smaller. These other routers would only have the summary route listed instead of the individual networks. Router 3 would only see the summary route

Layer 3 Technologies
Configure and verify manual and autosummarization with any routing protocol

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