Which of the following buses allows the management controller to grant access to its private storage area with no impact on normal system data?

A.
Private Management Bus (PMB)

B.
Server Management bus (SMB)

C.
Intelligent Platform Management Bus (IPMB)

D.
Intelligent Chassis Management Bus (ICMB)

Explanation:
The Private Management Bus (PMB) provides the proprietary memory storage structure and also enables data movement into and out of this memory structure. It allows the management controller to grant access to its private storage area with no impact on normal system data.
Incorrect
Answers:
B:
The server management bus (SMB) runs through the server board, enables communication between the management controller and the managed components, and checks the operation of field-replaceable units (FRUs) of the board. In addition to this, it is the SMB that enables the management controller to monitor the temperatures of the system processors.
C: The Intelligent Platform Management Bus (IPMB) runs throughout the server chassis, and is the local serial bus. The IPMB transfers important information between the monitoring and management devices of the server board. This includes information such as event information, system environmental monitoring information, and management control information.
D: The Intelligent Chassis Management Bus (ICMB) is used on Intel server systems to enable monitoring information and platform management information to be exchanged between different server platforms and peripherals. The ICMB therefore allows inter-chassis communications between different server platforms and peripherals.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 421-422.