IPv6 Implementation on Older Layer 2 Switches
Question
You are the lead network designer for an enterprise company called ABC, and you are leading design discussions regarding IPv6 implementation into their existing network.
A question is raised regarding older Layer 2 switches that exist in the network, and if any changes are required to these Layer 2 switches for successful IPv6 implementation.
Which two responses should you give? (Choose two.)
Answers
Explanations
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A. B. C. D. E.AD.
IPv6 is the latest version of the Internet Protocol and it provides many advantages over its predecessor, IPv4. However, implementing IPv6 into an existing network may require some changes to be made. In this scenario, the question is raised whether any changes are required to older Layer 2 switches for successful IPv6 implementation. Here are the two responses that are appropriate:
A. IPv6 is transparent on Layer 2 switches, so there is no need to make any changes to the Layer 2 switches.
This response is correct because IPv6 is designed to be backward-compatible with IPv4, and Layer 2 switches do not need any special configuration to support IPv6. Layer 2 switches are transparent to IPv6 packets, meaning that they do not need to understand IPv6 to forward IPv6 packets. IPv6 packets are simply treated as data frames and forwarded based on MAC addresses.
D. If IPv6 multicast deployment is planned, then make sure that Layer 2 switches support MLD snooping at Layer 2 switches.
This response is also correct because IPv6 uses multicast addressing for many important functions, including neighbor discovery, router discovery, and multicast group communication. Multicast Listener Discovery (MLD) is a protocol used by IPv6 nodes to discover and join multicast groups. Layer 2 switches can support MLD snooping, which allows the switch to listen in on MLD messages and selectively forward multicast traffic only to the ports that have requested it. This reduces unnecessary multicast traffic and helps to optimize network performance.
The other three responses are incorrect:
B. If IPv6 anycast deployment is planned, then make sure that Layer 2 switches support ICMPv6 snooping at Layer 2 switches.
ICMPv6 (Internet Control Message Protocol version 6) is a protocol used by IPv6 nodes to communicate error messages and other control information. Anycast is a type of addressing that allows multiple nodes to share the same IP address. However, there is no need for Layer 2 switches to support ICMPv6 snooping for successful anycast deployment. ICMPv6 snooping is not a required feature for anycast, and Layer 2 switches do not need to be aware of anycast addresses.
C. If IPv6 anycast deployment is planned, then make sure that Layer 2 switches support DHCPv6 snooping at Layer 2 switches.
DHCPv6 (Dynamic Host Configuration Protocol version 6) is a protocol used by IPv6 nodes to obtain IP addresses and other configuration information. Anycast deployment does not require DHCPv6 snooping, and Layer 2 switches do not need to be aware of anycast addresses.
E. If IPv6 anycast deployment is planned, then make sure that Layer 2 switches support ND snooping at Layer 2 switches.
ND (Neighbor Discovery) is a protocol used by IPv6 nodes to discover and manage neighbor relationships on the network. Anycast deployment does not require ND snooping, and Layer 2 switches do not need to be aware of anycast addresses.
In summary, for successful IPv6 implementation, Layer 2 switches do not require any special configuration to support IPv6. However, if IPv6 multicast deployment is planned, then Layer 2 switches should support MLD snooping to optimize network performance.
