多項選擇題Which three items are configured in MST configuration submode? ()

A. Region name
B. Configuration revision number
C. VLAN instance map
D. IST STP BPDU hello timer
E.  CST instance map
F. PVST+ instance map



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2.單項選擇題

Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree  Protocol (RSTP) algorithm, and warrants the use multiple spanning-trees? ()

A. IEEE 802.1s (MST)
B. IEEE 802.1Q (CST)
C. Cisco PVST+
D. IEEE 802.1d (STP)
E. None of the other alternatives apply

3.單項選擇題

pany uses MSTP within their switched LAN. 
What is the main purpose of Multiple Instance  Spanning Tree Protocol (MSTP)?()

A. To enhance Spanning Tree troubleshooting on multilayer switches
B. To reduce the total number of spanning tree instances necessary for a particular topology 
C. To provide faster convergence when topology changes occur in a switched network
D. To provide protection for STP when a link is unidirectional and BPDUs are being sent but not  received
E. None of the other alternatives apply

4.多項選擇題

The Company network utilizes the Multiple-instance Spanning Tree protocol in its switched LAN. 
 Which three statements about the MST protocol (IEEE 802.1S) are true? ()

A. To verify the MST configuration, the show pending command can be used in MST configuration  mode.
B. When RSTP and MSTP are configured; UplinkFast and BackboneFast must also be enabled.
C. All switches in the same MST region must have the same VLAN-to-instance mapping, but  different configuration revision numbers.
D. All switches in an MST region, except distribution layer switches, should have their priority  lowered from the default value 32768.
E. An MST region is a group of MST switches that appear as a single virtual bridge to adjacent  CST and MST regions.
F. Enabling MST with the "spanning-tree modemst" global configuration command also enables  RSTP.

5.單項選擇題

On switch R1 you issue the "udld enable" global command. 
What does this command accomplish? ()

A. Enables all fiber-optic LAN ports for Unidirectional LINK Detection (UDLD)
B. Enables all copper media LAN ports Unidirectional Link Detection (UDLD)
C. Overrides the default UDLS setting for all ports
D. Globally enables all ports on the device for Unidirectional Link Detection (UDLS)
E. None of the other alternatives apply

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