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CCNP Interview Questions

Q   |   QA

You need to examine the third byte because that is the byte where the four prefixes differ:

0 = 0 0 0 0 0 0 0 0

32 = 0 0 1 0 0 0 0 0

64 = 0 1 0 0 0 0 0 0

96 = 0 1 1 0 0 0 0 0

The last 7 bits are irrelevant, so the mask is 1 0 0 0 0 0 0 0 and the EIGRP command is ip summary-address eigrp 1 10.1.0.0 255.255.128.0. 

Areas allow the design of a hierarchical network. Routes can be summarized or blocked in an area to reduce the amount of routing information on internal OSPF routers. 

OSPF databases on routers in the same area must be identical. If route summarization was allowed within an area, some routers would have specific routes and some routers would have summary routes for routes in the area. If this were allowed, the databases for the area would never agree. 

OSPF intra-area and interarea routes, and a default route. External routes are not advertised into a stub area. 

OSPF intra-area routes and a default route. OSPF interarea and external routes are not advertised into a totally stubby area. 

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