Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 340

The IPv6 network is under attack by an unknown source that is neither in the binding table nor learned through neighbor discovery. Which feature helps prevent the attack?

Answer options

• A. IPv6 Destination Guard
• B. IPv6 Prefix Guard
• C. IPv6 Router Advertisement Guard
• D. IPv6 Snooping

Correct answer: B

Explanation

The correct answer is IPv6 Prefix Guard, as it prevents unauthorized devices from using invalid prefixes and thus mitigates certain types of attacks. IPv6 Destination Guard and IPv6 Router Advertisement Guard serve different purposes, focusing on traffic filtering and advertisement control respectively, while IPv6 Snooping is more related to DHCP operations rather than prefix validation.