Cisco Certified Network Associate (CCNA) Practice Exam

Which address type is not forwarded by routers and is used for local communication in IPv6?

1. Global Unicast address

2. Link-Local address

3. Multicast address

4. Anycast address

The correct answer is: Link-Local address

The correct answer is the Link-Local address. Link-Local addresses in IPv6 are intended for communication between nodes on the same local network segment or link. These addresses are automatically configured on all IPv6-enabled interfaces and can be used for functions such as neighbor discovery and routing information exchange within that local link. Since Link-Local addresses are only relevant for communication within the local segment, routers will not forward packets that are addressed with Link-Local addresses to other networks. This makes them ideal for local tasks, but unsuitable for global communication. Global Unicast addresses, on the other hand, are routable on the global Internet and are designed for communication between hosts across different networks. Multicast addresses allow for communication to multiple hosts at once and are capable of being routed across networks. Anycast addresses are assigned to a group of interfaces, and packets are routed to the nearest interface based on the routing protocols in use. None of these address types are limited to local communication like the Link-Local address.