350-001 Question #108: Real Exam Question with Answer & Explanation

The correct answer is A: 172.30.1.0/24 and 10.1.2.0/24; EIGRP only performs autosummarization at the edge between two. R1 is not configured for auto-summary but R2 is configured for auto-summary as auto-summary is enabled by default. Therefore although 172.30.1.0 is not summarized by R1 it will be summarized by R2 when R2 advertises this route to R3. However, both of R2's interfaces are on the 10

Question

Refer to the exhibit. In this network, R1 is configured not to perform autosummarization within EIGRP. What routes will R3 learn from R2 through EIGRP?

Exhibit

Options

A172.30.1.0/24 and 10.1.2.0/24; EIGRP only performs autosummarization at the edge between two
B172.30.0.0/16 and 10.1.2.0/24; R2 will perform autosummarization, although R1 will not.
CSince R2 is configured without autosummarization, it will not propagate the 172.30.1.0/24 route.
D172.30.0.0/8 and 10.0.0.0/8.

Explanation

R1 is not configured for auto-summary but R2 is configured for auto-summary as auto-summary is enabled by default. Therefore although 172.30.1.0 is not summarized by R1 it will be summarized by R2 when R2 advertises this route to R3. However, both of R2's interfaces are on the 10.x.x.x network and so is R3's single interface. As auto summary is performed based on classful network boundaries R2 will advertise the classless network addresses of both interfaces Auto-Summarization EIGRP performs an auto-summarization each time it crosses a border between two different For example, in Figure 13, Router Two advertises only the 10.0.0.0/8 network to Router One, because the interface Router Two uses to reach Router One is in a different major network.

Community Discussion

No community discussion yet for this question.

Full 350-001 Practice