IP Services - Memory Builders (1)

HSRP
Hot Standby Router Protocols - is a cisco-proprietary feature by which multiple routers can provide interface IP address redundancy so that hosts using the shared, virtual IP address as their default gateway can still reach the rest of a network even if one or more routers fail. 

VRRP
 Virtual Redundancy Router Protocol - A standard (RFC 3768) feature by which multiple routers can provide interface IP address redundancy so that hosts using the shared, virtual IP address as their default gateway can still reach the rest of a network even if one or more routers fail.

>> HSRP = VRRP, One is Cisco Proprietary, others is open standard. Similar with ISL and Dot1Q

GLBP
Gateway Load Balancing Protocol - Is a cisco-proprietary feature by which multiple routers can provide interface IP address redundancy, as well as cause a set of clients to load-balance their traffic across multiple routers inside the GLBP group. 

ARP
Address Resolution Protocol - Defined in RFC 826, a protocol used on LANs so that IP host can discover the MAC Address of another device that is using particular IP address