IPv6 Router Advertisement Messages: True Statements, Exam 200-125 | Cisco Certification

True Statements about IPv6 Router Advertisement Messages

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Which two statements about IPv6 router advertisement messages are true? (Choose two.)



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A. B. C. D. E.


A) They use ICMPv6 type 134: This statement is true. Router Advertisement (RA) messages are sent using ICMPv6 type 134. ICMPv6 type 134 is used to convey information about the local link to other nodes on the same link.

B) The advertised prefix length must be 64 bits: This statement is also true. The advertised prefix length in an RA message should be 64 bits, which is the standard prefix length for IPv6 addresses. This is because the first 64 bits of an IPv6 address is used to represent the network prefix, while the last 64 bits are used to represent the interface identifier.

C) The advertised prefix length must be 48 bits: This statement is false. The advertised prefix length should be 64 bits, not 48 bits.

D) They are sourced from the configured IPv6 interface address: This statement is true. RA messages are sourced from the IPv6 address of the sending router's interface that is connected to the link. This address is typically a link-local address, but it can also be a global unicast address if the router is connected to multiple links.

E) Their destination is always the link-local address of the neighboring node: This statement is false. The destination address for an RA message depends on the intended recipients. If the RA message is intended for all nodes on the link, the destination address is the all-nodes multicast address (FF02::1). However, if the RA message is intended for a specific node, the destination address is the unicast address of that node.