200-201 Question 283
Single answerYou are a security analyst investigating a potential unauthorized network access incident in an enterprise network that uses IPv6. While analyzing the network traffic, you notice a large number of packets with the destination address 'FF02::1'. What does this address indicate, and how should you proceed?
- A
This is a multicast address used to reach all nodes on a local link, and it may indicate a network discovery operation.
- B
This is an anycast address used to route packets to the nearest server, and it likely represents legitimate traffic.
- C
This is a unicast address used for direct communication between two devices, and it is unlikely to be suspicious.
- D
This is a broadcast address used to communicate with all devices in the network segment, and it may indicate a potential attack.
Show answer and explanation
Correct answer: A
Explanation
FF02::1 is a well-known IPv6 multicast address used to communicate with all nodes on the local link. Observing a high volume of traffic to this address could indicate a network discovery operation, which is often part of reconnaissance by an attacker. Recognizing and understanding IPv6 addressing is essential for identifying and mitigating potential threats.
- A. Correct.
FF02::1 is a multicast address used to reach all nodes on the local link in IPv6 networks. A large number of packets to this address could indicate a network discovery operation, possibly for reconnaissance.
- B. Incorrect.
Anycast addresses are used to send packets to the nearest instance of a service and are not represented by FF02::1. This option is incorrect.
- C. Incorrect.
Unicast addresses are used for direct communication between two devices, and FF02::1 is not a unicast address. This option is incorrect.
- D. Incorrect.
IPv6 does not use broadcast addresses; instead, it uses multicast. FF02::1 is a multicast address, not a broadcast address. This option is incorrect.