Cisco Certified Network Professional (CCNP) Question: Download Questions PDF
Determine the EIGRP command to summarize the following networks:
10.1.0.0/19
10.1.32.0/19
10.1.64.0/19
10.1.96.0/19
Answer:
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.
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.
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