HSRP Operation: True Statements

ABF

HSRP (Hot Standby Router Protocol) is a Cisco proprietary protocol that allows two or more routers to work together to present the appearance of a single virtual router to the hosts on a LAN. HSRP provides redundancy, load balancing, and automatic failover in case of a primary router failure.

The three statements that are true about HSRP operation are:

A. The virtual IP address and virtual address are active on the HSRP Master router. This statement is true. In an HSRP group, one router is elected as the active router (HSRP Master) while the other routers are in standby mode. The active router is responsible for forwarding packets sent to the virtual IP address. The virtual IP address is active on the HSRP Master router and is used as the source address for packets sent from the HSRP group.

B. The HSRP default timers are a 3 second hello interval and a 10 second dead interval. This statement is true. HSRP uses hello messages to communicate between routers in the same HSRP group. The hello interval determines how often the routers send hello messages to each other. The dead interval is the amount of time a router waits before declaring a neighbor as down. The default hello interval is 3 seconds, and the default dead interval is 10 seconds.

F. HSRP supports up to 255 groups per interface, enabling an administrative form of load balancing. This statement is true. HSRP supports up to 255 groups per interface, which enables an administrative form of load balancing. Multiple HSRP groups can be configured on the same interface, each with its own virtual IP address. This allows traffic to be distributed across multiple routers.

The following statements are false:

C. HSRP supports only clear-text authentication. This statement is false. HSRP supports multiple authentication types, including clear text, MD5, and SHA.

D. The HSRP virtual IP address must be on a different subnet than the routers' interfaces on the same LAN. This statement is false. The HSRP virtual IP address must be on the same subnet as the routers' interfaces on the same LAN.

E. The HSRP virtual IP address must be the same as one of the router's interface addresses on the LAN. This statement is false. The HSRP virtual IP address must be a unique IP address that is not assigned to any physical device on the network.