Which is the most effective technique to contain EIGRP queries?

A.
route summarization

B.
configuring route filters

C.
using a hierarchical addressing scheme

D.
establishing separate autonomous systems

Explanation:
After you determine the minimum routing requirements, you can make EIGRP more
scalable. Two of the best options are the following:
1.Configure route summarization using the ip summary-address eigrp command on the
outbound interface of the appropriate routers.
2. Configure the remote routers as stub EIGRP routers. Summarizing routes limits the
queries scope by limiting a routers knowledge of networks subnets. If a subnet goes down,
queries go only as far as the routers that have knowledge of that subnet.