An engineer plans to configure summary routes with the ip summary-address eigrp asn
prefix mask command. Which of the following, when added to such a command, would
create a summary that includes all four of the following subnets: 10.1.100.0/25,
10.1.101.96/27, 10.1.101.224/28, and 10.1.100.128.25?
A.
10.1.0.0 255.255.192.0
B.
10.1.64.0 255.255.192.0
C.
10.1.100.0 255.255.255.0
D.
10.1.98.0 255.255.252.0
Explanation:
The 10.1.0.0/18 implies a range from 10.1.0.0–10.1.63.255, which includes none of the
four subnets. 10.1.64.0/18 implies a range from 10.1.64.0–10.1.127.255, which includes
all subnets. 10.1.100.0/24 implies range 10.1.100.0–10.1.100.255, which leaves out two
of the subnets. Finally, 10.1.98.0/22 does not actually represent a summary–instead,
10.1.96.0/22 represents range 10.1.96.0–10.1.99.255, with 10.1.98.0 as listed in answer
D being an IP address in that rangE. As such, IOS would actually accept the command,
and change the parameter from 10.1.98.0 to 10.1.96.0, and would not include
the four listed subnets.