CCDE: Cisco Certified Design Expert (Written) — Question 30

Which IPv4 addressing and routing scheme can increase the availability of a network service during a DoS attack?

Answer options

• A. unicast
• B. broadcast
• C. anycast
• D. multicast

Correct answer: C

Explanation

The correct answer is C, anycast, which allows multiple servers to share the same IP address, directing traffic to the nearest server for improved availability during a DoS attack. Unicast (A) sends data to a single destination, which does not help with availability, while broadcast (B) sends data to all nodes, potentially overwhelming the network. Multicast (D) targets a specific group, but doesn't provide the same level of redundancy as anycast.