Discover the key considerations for deploying IS-IS in your network, focusing on the TLV requirements for supporting IPv4 and IPv6 reachability. Learn how to ensure seamless connectivity across your network infrastructure.
Table of Contents
Question
You are asked to explore deploying IS-IS in your network.
What are two considerations in this scenario? (Choose two.)
A. TLVs are not required to support IPv4 reachability.
B. TLVs are not required to support IPv6 reachability.
C. TLVs are required to support IPv6 reachability.
D. TLVs are required to support IPv4 reachability.
Answer
C. TLVs are required to support IPv6 reachability.
D. TLVs are required to support IPv4 reachability.
Explanation
When exploring the deployment of IS-IS (Intermediate System to Intermediate System) in your network, there are two crucial considerations regarding the use of TLVs (Type-Length-Values) for supporting IP reachability:
- TLVs are required to support IPv4 reachability: In order for IS-IS to support IPv4 routing and enable reachability between network devices, the protocol relies on specific TLVs. These TLVs carry essential information about IPv4 network prefixes and their associated metrics, allowing IS-IS routers to build and maintain accurate routing tables. Without the proper configuration of IPv4-related TLVs, IS-IS would be unable to facilitate IPv4 connectivity throughout the network.
- TLVs are required to support IPv6 reachability: Similar to IPv4, IS-IS also depends on TLVs to support IPv6 routing and reachability. IPv6-specific TLVs are used to propagate IPv6 network prefixes and their corresponding metrics among IS-IS routers. These TLVs enable the protocol to construct efficient IPv6 routing tables and ensure seamless communication between devices using IPv6 addressing. Neglecting to configure the necessary IPv6 TLVs would result in a failure to establish IPv6 connectivity within the IS-IS network.
In summary, when planning to deploy IS-IS in your network, it is essential to recognize that TLVs play a critical role in supporting both IPv4 and IPv6 reachability. By properly configuring the required TLVs for each IP version, you can ensure that your IS-IS implementation successfully facilitates routing and connectivity across your network infrastructure.
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