COMPUTER NETWORKING

NETWORK LAYER

UNICAST ROUTING

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which statement about OSPF E1 routes are true?
A
They are preferred over interarea routes.
B
They use the OSPF cost from redistribution and the OSPF cost to the ASBR.
C
They use only the OSPF cost to the ASBR from redistribution.
D
NONE
Explanation: 

Detailed explanation-1: -Basically the difference between E1 and E2 external routes is: E1 includes – the internal cost to ASBR added to the external cost, E2 does not include – internal cost. it is same as external cost.

Detailed explanation-2: -OSPF uses the cost as the route metric. Each OSPF-enabled interface has a cost value. The formula used to calculate the cost is: Cost = 100M/Interface bandwidth.

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