Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsMedium
A network technician is configuring a new IPv6-enabled router. They need to assign a unique, publicly routable IPv6 address to an interface that can be accessed from anywhere on the global internet. Which type of IPv6 address should be configured?
- AUnique Local Address
- BLink-Local Address
- CMulticast Address
- DGlobal Unicast Address
Show answer & explanationAnswer & explanation
Correct answer: D. Global Unicast Address
A Global Unicast Address (GUA) in IPv6 is equivalent to a public IPv4 address. It is globally unique and routable across the entire internet, making it suitable for publicly accessible interfaces.
Why the other options are wrong
- A. Unique Local Addresses are similar to private IPv4 addresses, used for internal networks and not routable on the global internet.
- B. Link-Local addresses are used for communication only on the local link and are not routable beyond it.
- C. Multicast addresses are used for sending data to a group of devices, not for unique device identification for public access.
IPv6 Global Unicast Address (GUA)
An IPv6 address type that is globally unique and routable across the entire public internet, allowing direct communication from any internet-connected device.
- Starts with binary 001 (e.g., typically 2000::/3 prefix).
- Equivalent to a public IPv4 address.
- Assigned by Regional Internet Registries (RIRs).
Memory trick: Global for the world, local for the neighborhood.