# Question 216 of 367 from exam 200-301-CCNA: Implementing and Administering Cisco Solutions

### Question

Refer to the exhibit.

Which address and mask combination represents a summary of the routes learned by EIGRP?

### Answers

### Explanations

A.
B.
C.
D.
E.
F.

C.

The binary version of 20 is 10100

The binary version of 16 is 10000

The binary version of 24 is 11000

The binary version of 28 is 11100

The subnet mask is /28

The mask is 255.255.255.240

Note: From the output above, EIGRP learned 4 routes and we need to find out the summary of them: ->192.168.25.16 192.168.25.20

->192.168.25.24 ->192.168.25.28 -&gt; The increment should be 28 ?16 = 12 but 12 is not an exponentiation of 2; so we must choose 16 (24)

Therefore the subnet mask is /28 (=1111 1111.1111 1111.1111 1111.11110000) = 255.255.255.240

So the best answer should be 192.168.25.16 255.255.255.240.