Which of the following protocols enables a group of routers to form a single virtual router, and then use the real IP address of a router as the gateway address?
A.
HSRP
B.
IRDP
C.
Proxy ARP
D.
GLBP
E.
VRRP
Explanation:
The Virtual Router Redundancy Protocol (VRRP) feature enables a group of routers to form a single virtual router. The LAN clients can then be configured with the virtual router as their default gateway. The virtual router, representing a group of routers, is also known as a VRRP group. VRRP is defined in RFC 2338.
Reference: http://www.faqs.org/rfcs/rfc2338.html