Question

what is a key difference between hsrp and vrrp?

a vrrp allows for load balancing, while hsrp does not.
b vrrp can only be used in ipv6 networks.
c hsrp is an open standard, while vrrp is proprietary to cisco.
d hsrp requires each router interface to have a unique ip address, but vrrp does not.

Explanation:

Analyze the protocols

First Hop Redundancy Protocols (FHRPs) provide default gateway redundancy. Hot Standby Router Protocol (HSRP) is Cisco-proprietary, while Virtual Router Redundancy Protocol (VRRP) is an open standard (RFC 5798).

Evaluate option A

Both HSRP and VRRP do not natively support active-active load balancing within a single group; they designate one active/master router and one standby/backup router. Load balancing is achieved by configuring multiple groups.

Evaluate option B

VRRP is not limited to IPv6; it is widely used in both IPv4 and IPv6 networks.

Evaluate option C

This option reverses the ownership. HSRP is proprietary to Cisco, whereas VRRP is the open standard.

Evaluate option D

In HSRP, the virtual IP address must be different from the physical IP addresses assigned to the router interfaces. In VRRP, the virtual IP address can be the same as the physical IP address of the master router's interface (known as the IP address owner). Therefore, HSRP requires each router interface to have a unique IP address distinct from the virtual IP, while VRRP does not.

Answer:

• (A) VRRP allows for load balancing, while HSRP does not.
• (B) VRRP can only be used in IPv6 networks.
• (C) HSRP is an open standard, while VRRP is proprietary to Cisco.
• (D) HSRP requires each router interface to have a unique IP address, but VRRP does not. (Correct answer)