Cisco Certified Support Technician (CCST) NetworkingIP ConnectivityMedium
A network engineer is designing an IPv6 network. They need to configure a router to advertise its presence and network configuration information to hosts on the local link without requiring a DHCPv6 server. Which IPv6 routing protocol or mechanism enables this functionality?
- ARIPng
- BRouter Advertisement (RA)
- COSPFv3
- DEIGRP for IPv6
Show answer & explanationAnswer & explanation
Correct answer: B. Router Advertisement (RA)
Router Advertisement (RA) messages, part of Neighbor Discovery Protocol (NDP), allow routers to advertise their presence, prefixes, and other configuration parameters to hosts for Stateless Address Autoconfiguration (SLAAC).
Why the other options are wrong
- A. RIPng is an IPv6 routing protocol for exchanging routing information between routers, not for host configuration.
- C. OSPFv3 is an IPv6 routing protocol for exchanging routing information between routers, not for host configuration.
- D. EIGRP for IPv6 is an IPv6 routing protocol for exchanging routing information between routers, not for host configuration.
IPv6 Router Advertisement (RA)
Router Advertisement (RA) messages are part of IPv6 Neighbor Discovery Protocol, used by routers to announce their presence and network configuration information to hosts on a link.
- Enables Stateless Address Autoconfiguration (SLAAC).
- Includes network prefixes, default router, and other parameters.
- Sent periodically or in response to Router Solicitation (RS) messages.
Memory trick: Routers Announce Addresses Automatically.