Discover the reason behind the presence of two TLVs in an IS-IS interface database. Learn about the significance of I/L1 and I/L2 metrics and how they relate to the network topology and configuration.
Table of Contents
Question
Click the Exhibit button.
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.
B. Both IPv4 and IPv6 are being used in the topology.
C. Wide metrics have specifically been requested.
D. The interface specified a metric of 100 for L2.
Answer
A. There are both narrow and wide metric devices in the topology.
Explanation
Based on the IS-IS interface database information shown in the exhibit, there are two TLVs (Type-Length-Values) present: the I/L1 metric (10/100) and the I/L2 metric (10/100).
The most likely reason for the presence of two TLVs in this scenario is that both IPv4 and IPv6 are being used in the network topology (Option B).
In IS-IS, TLVs are used to exchange routing information between devices. The presence of two separate TLVs for I/L1 and I/L2 metrics suggests that the network is configured to support both IPv4 and IPv6 routing.
Here’s why the other options are less likely:
A. Narrow and wide metrics: While IS-IS supports both narrow and wide metrics, the presence of two TLVs alone does not necessarily indicate the coexistence of narrow and wide metric devices in the topology.
C. Wide metrics requested: The exhibit does not provide any information about specific requests for wide metrics. The presence of two TLVs is more likely related to the use of both IPv4 and IPv6.
D. L2 metric of 100: The metric value of 100 for L2 is shown in the exhibit, but this does not explain the presence of two TLVs. The metric value is independent of the number of TLVs.
In summary, the most probable reason for the presence of two TLVs (I/L1 and I/L2 metrics) in the IS-IS interface database is that the network topology is utilizing both IPv4 and IPv6 routing protocols.
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