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Which one of the following is an open standard First Hop Redundancy Protocol?
GLBP
DMVPN
VRRP
HSRP
VRRP or Virtual Router Redundancy Protocol is a form of FHRP or First Hop Redundancy Protocol. VRRP is an open standard FHRP that achieves availability and reliability of routing paths via automatic default gateway selections on an IP subnetwork by creating virtual routers. HSRP or Hot Standby Router Protocol is a Cisco-proprietary redundancy protocol that provides high network availability by providing first-hop redundancy for IP hosts on an IEEE 802 LAN configured with a default gateway IP address. GLBP or Gateway Load Balancing Protocol is also a Cisco-proprietary protocol that works like HSRP and VRRP but overcomes the limitation of existing FHRPs by adding a load balancing mechanism.
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