CCIE Security Written Exam: Answer to "Which option represents IPv6 address ff02::1?"

IPv6 Address ff02::1 Explained

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Question

Which option represents IPv6 address ff02::1?

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Explanations

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A. B. C. D.

C.

The IPv6 address ff02::1 represents the "All nodes on the local network" multicast group. In IPv6, multicast addresses begin with "ff" in their first octet.

The address ff02::1 is a reserved multicast address that represents all nodes on the local network. It is similar to the IPv4 broadcast address of 255.255.255.255, except that it is a multicast address that is sent to all nodes on the local network.

This address is used by protocols such as Neighbor Discovery Protocol (NDP) to discover other nodes on the local network. Other IPv6 protocols, such as DHCPv6 and DNS, also use this multicast address to send messages to all nodes on the local network.

Option A, PIM routers, is incorrect because the IPv6 address for PIM routers is ff02::d. Option B, RIP routers, is incorrect because the IPv6 address for RIP routers is ff02::9. Option D, NTP, is incorrect because the IPv6 address for NTP is ff0x::101, where "x" is the scope of the multicast group.

Therefore, the correct answer is option C, "All nodes on the local network."