Which Internet Control Message Protocol (ICMPv6) message type would you receive if you incurred an IP header error?

Which Internet Control Message Protocol (ICMPv6) message type would you receive if you
incurred an IP header error?

A.
Destination Unreachable

B.
Redirect

C.
Parameter problem

D.
Time exceeded

Explanation:
If an IPv6 node processing a packet finds a problem with a field in the IPv6 header or extension
headers such that it cannot complete processing the packet, it MUST discard the packet and
SHOULD send an ICMPv6 Parameter Problem message to the packet’s source, indicating the
type and location of the problem. (Reference: RFC 2463)
Incorrect Answers:
A: A Destination Unreachable message SHOULD be generated by a router, or by the IPv6 layer in
the originating node, in response to a packet that cannot be delivered to its destination address for
reasons other than congestion. (An ICMPv6 message MUST NOT be generated if a packet is
dropped due to congestion.)If the reason for the failure to deliver is lack of a matching entry in the
forwarding node’s routing table, the Code field is set to 0 (NOTE: this error can occur only in
nodes that do not hold a “default route” in their routing tables).If the reason for the failure to deliver
is administrative prohibition, e.g., a “firewall filter”, the Code field is set to 1.If there is any other
reason for the failure to deliver, e.g., inability to resolve the IPv6 destination address into a
corresponding link address, or a link-specific problem of some sort, then the Code field is set to
3.A destination node SHOULD send a Destination Unreachable message withCode 4 in response

to a packet for which the transport protocol (e.g., UDP) has no listener, if that transport protocol
has no alternative means to inform the sender. (Reference: RFC 2463)
B: Neighbor Discovery defines five different ICMP packet types: A pair of Router Solicitation and
Router Advertisement messages, a pair of Neighbor Solicitation and Neighbor Advertisements
messages, and a Redirect Message. The Redirect is used by routers to inform hosts of a better
first hop for a destination. (Reference: RFC 2461)
D: If a router receives a packet with a Hop Limit of zero, or a router decrements a packet’s Hop
Limit to zero, it MUST discard the packet and send an ICMPv6 Time Exceeded message with
Code 0 to the source of the packet. This indicates either a routing loop or too small an initial Hop
Limit value. (Reference: RFC 2463)