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Question 13 - JN0-664 discussion

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Exhibit

A network is using IS-IS for routing.

In this scenario, why are there two TLVs shown in the exhibit?

A.
There are both narrow and wide metric devices in the topology
Answers
A.
There are both narrow and wide metric devices in the topology
B.
The interface specified a metric of 100 for L2.
Answers
B.
The interface specified a metric of 100 for L2.
C.
Wide metrics have specifically been requested
Answers
C.
Wide metrics have specifically been requested
D.
Both IPv4 and IPv6 are being used in the topology
Answers
D.
Both IPv4 and IPv6 are being used in the topology
Suggested answer: A

Explanation:

TLVs are tuples of (Type, Length, Value) that can be advertised in IS-IS packets. TLVs can carry different kinds of information in the Link State Packets (LSPs). IS-IS supports both narrow and wide metrics for link costs. Narrow metrics use a single octet to encode the link cost, while wide metrics use three octets. Narrow metrics have a maximum value of 63, while wide metrics have a maximum value of 16777215. If there are both narrow and wide metric devices in the topology, IS-IS will advertise two TLVs for each link: one with the narrow metric and one with the wide metric.This allows backward compatibility with older devices that only support narrow metrics12.

asked 18/09/2024
Giorgio Bertocchi
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