What two ICMPv6 message types must be permitted through IPv6 access control lists to allow resolution of Layer 3 addresses to Layer 2 MAC addresses? (Choose two.)
- neighbor solicitations
- echo requests
- neighbor advertisements
- echo replies
- router solicitations
- router advertisements
Explanation: IPv6 performs address resolution (mapping a known Layer 3 IPv6 address to a Layer 2 MAC address) using the Neighbor Discovery (ND) protocol instead of ARP. This process specifically requires Neighbor Solicitation (NS) messages to request the MAC address and Neighbor Advertisement (NA) messages to provide it; therefore, both must be permitted through access control lists for local network communication to function.
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