多项选择题
avoid Layer 2 loops. Which two of the following are most probably the reasons for that preference?（）
A. Information about port roles is sent to all switches.
B. RSTPs that are based on Cisco products require no additional configuration.
C. Features such as UplinkFast and BackboneFast are compatible with RSTP.
D. An RSTP that is based on Cisco products generally performs better than the Cisco proprietary 802.1D enhancements.
单项选择题 As an experienced Network Engineer, you are responsible for network connectivity and system configuration. Which of the following protocols will be supported by Cisco Nonstop Forwarding (NSF)?（）
单项选择题 As a network administrator, you have configured a Catalyst 6500 Series Switch with redundant supervisor engine in a CIS network. What is the result of issuing the redundancy force-switchover command on that switch?（）
单项选择题 As an experienced technician, you are required to configure and verify SRM with SSO redundancy. In such a situation, you have to issue several commands in proper orders. Which of the following is correct?（）