When variable length subnet masking is used, what does the term route aggregation describe?
A.
combining routes to multiple networks into one supernet
B.
reducing the number of unusable addresses by creating many subnets from one supernet
C.
reclaiming unused address space by changing the subnet size
D.
calculating the total number of available host addresses in the AS
Explanation:
In the networking world route aggregate means combining routes to multiple networks into one.
This is also known as route summarization or supernetting. It is normally used to reduce the
number of route entries in the routing table by advertising numerous routes into one larger route.
Reference: CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN 1-58720-
083-X) Page 236.