Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 136

Which configuration feature should be used to block rogue router advertisements instead of using the IPv6 Router Advertisement Guard feature?

Answer options

• A. VACL blocking broadcast frames from nonauthorized hosts
• B. PVLANs with promiscuous ports associated to route advertisements and isolated ports for nodes
• C. PVLANs with community ports associated to route advertisements and isolated ports for nodes
• D. IPv4 ACL blocking route advertisements from nonauthorized hosts

Correct answer: B

Explanation

The correct answer is B, as PVLANs with promiscuous ports allow certain devices to communicate while isolating others, effectively controlling router advertisements. Option A does not specifically address router advertisements, while option C uses community ports, which do not provide the same level of isolation. Option D applies to IPv4, which is not relevant for blocking IPv6 router advertisements.