Three Cisco Catalyst switches have been configured with a first-hop redundancy protocol. While
reviewing some show commands, debug output, and the syslog, you discover the following
information:
Jan 9 08:00:42.623: %STANDBY-6-STATECHANGF. Standby: 49:
Vlan149 state Standby -> Active

Jan 9 08:00:56.011: %STANDBY-6-STATECHANGF. Standby: 49:
Vlan149 state Active -> Speak
Jan 9 08:01:03.011: %STANDBY-6-STATECHANGF. Standby: 49:
Vlan149 state Speak -> Standby
Jan 9 08:01:29.427: %STANDBY-6-STATECHANGF. Standby: 49:
Vlan149 state Standby -> Active
Jan 9 08:01:36.808: %STANDBY-6-STATECHANGF. Standby: 49:
Vlan149 state Active -> Speak
Jan 9 08:01:43.808: %STANDBY-6-STATECHANGF. Standby: 49:
Vlan149 state Speak -> Standby
What conclusion can you infer from this information?

A.
VRRP is initializing and operating correctly.

B.
HSRP is initializing and operating correctly.

C.
GLBP is initializing and operating correctly.

D.
VRRP is not exchanging three hello messages properly.

E.
HSRP is not exchanging three hello messages properly.

F.
GLBP is not exchanging three hello messages properly.

Explanation:
These error messages describe a situation in which a standby HSRP router did not receive three
successive HSRP hello packets from its HSRP peer. The output shows that the standby router
moves from the standby state to the active state. Shortly thereafter, the router returns to the
standby state. Unless this error message occurs during the initial installation, an HSRP issue
probably does not cause the error message. The error messages signify the loss of HSRP hellos
between the peers. When you troubleshoot this issue, you must verify the communication between
the HSRP peers. A random, momentary loss of data communication between the peers is the
most common problem that results in these messages. HSRP state changes are often due to High
CPU Utilization. If the error message is due to high CPU utilization, put a sniffer on the network
and the trace the system that causes the high CPU utilization. There are several possible causes
for the loss of HSRP packets between the peers. The most common problems are physical layer
problems, excessive network traffic caused by spanning tree issues or excessive traffic caused by
each VLAN.

Reference:
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094afd.shtml#t1