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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Dallas is in Area 0, it's area 0 which is the backbone and prefixes that have to be summarized are in are 1, son it's 1->0 , LSA Type three summarization should be applied on ABR Atlanta indicating number of destination area: area 0, therefore neither B or D are correct
Correct answer is D, I was wrong , this is a range not a filter, Imissed the key word , range is applied to source of the LSA, my apology.
We must configure a summarized route for Area 1 information and advertise it to the Dallas router to reduce LSA type 3 messages. Atlanta(config)# router ospf <process ID> Atlanta (config-router)# area 1 range 192.168.0.0 255.255.248.0 Network 192.168.0.0/22 with a SM 255.255.252.0 has the following: Network IP: 192.168.0.0 First IP: 192.168.0.1 Last IP: 192.168.3.254 Broadcast IP: 192.168.3.255 It encompasses all the IP ranges for all the individual routes being advertised by Area 1 routers.