Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsMedium
A network architect is designing an IPv6 addressing scheme for a global organization. They need to ensure that each device has a unique, globally routable address that can be accessed directly from the internet. Which type of IPv6 address should be primarily used for this purpose?
- ALink-local address
- BUnique local address (ULA)
- CMulticast address
- DGlobal unicast address (GUA)
Show answer & explanationAnswer & explanation
Correct answer: D. Global unicast address (GUA)
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 direct internet access.
Why the other options are wrong
- A. Link-local addresses are only valid on the local link and not routable.
- B. Unique Local Addresses (ULAs) are similar to private IPv4 addresses, routable within an organization but not on the global internet.
- C. Multicast addresses are used for one-to-many communication, not for unique device identification for general internet access.
IPv6 Global Unicast Address (GUA)
An IPv6 Global Unicast Address is a globally unique and routable address, allowing direct communication over the public internet.
- Equivalent to public IPv4 addresses.
- Starts with binary '001', typically represented as 2000::/3.
- Used for host-to-host communication across the internet.
Memory trick: GUA: Global, Unique, Accessible.