What are three benefits of GLBP? (Choose three.)

What are three benefits of GLBP? (Choose three.)
A . GLBP supports up to eight virtual forwarders per GLBP group.
B . GLBP supports clear text and MD5 password authentication between GLBP group members.
C . GLBP is an open source standardized protocol that can be used with multiple vendors.
D . GLBP supports up to 1024 virtual routers.
E . GLBP can load share traffic across a maximum of four routers.
F . GLBP elects two AVGs and two standby AVGs for redundancy.

View Answer

Answer: B, D, E

Explanation:

http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fs_glbp2.html

Load Sharing

You can configure GLBP in such a way that traffic from LAN clients can be shared by multiple routers, thereby sharing the traffic load more equitably among available routers.

Multiple Virtual Routers GLBP supports up to 1024 virtual routers (GLBP groups) on each physical interface of a router, and up to four virtual forwarders per group.

Preemption

The redundancy scheme of GLBP enables you to preempt an active virtual gateway with a higher priority backup virtual gateway that has become available. Forwarder preemption works in a similar way, except that forwarder preemption uses weighting instead of priority and is enabled by default.

Authentication

You can use a simple text password authentication scheme between GLBP group members to detect configuration errors. A router within a GLBP group with a different authentication string than other routers will be ignored by other group members.

http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-s/unicast/configuration/guide/l3_glbp.html

GLBP Authentication

GLBP has three authentication types:

MD5 authentication

Plain text authentication

No authentication

MD5 authentication provides greater security than plain text authentication. MD5 authentication allows each GLBP group member to use a secret key to generate a keyed MD5 hash that is part of the outgoing packet. At the receiving end, a keyed hash of an incoming packet is generated. If the hash within the incoming packet does not match the generated hash, the packet is ignored. The key for the MD5 hash can either be given directly in the configuration using a key string or supplied indirectly through a key chain. You can also choose to use a simple password in plain text to authenticate GLBP packets, or choose no authentication for GLBP.