單項選擇題

Refer to the show spanning-tree mst configuration output shown in the exhibit.
 What should be  changed in the configuration of the switch SW_2 in order for it to participate in the same MST  region? ()

A. Switch SW_2 must be configured with an instance number of 2.
B. Switch SW_2 must be configured with a different VLAN range.
C. Switch SW_2 must be configured with the revision number of 1.
D. Switch SW_2 must be configured with a different MST name.


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1.單項選擇題

While logged into a Company switch you issue the following command:  
CompanySwitch(config-mst)# instance 10 vlan 11-12  
What does this command accomplish?()

A. It enables a PVST+ instance of 10 for vlan 11 and vlan 12
B. It enables vlan 11 and vlan 12 to be part of the MST region 10
C. It maps vlan 11 and vlan 12 to the MST instance of 10.
D. It creates an Internal Spanning Tree (IST) instance of 10 for vlan 11 and vlan 12  
E. It create a Common Spanning Tree (CST) instance of 10 for vlan 11 and vlan 12
F. It starts two instances of MST, one instance for vlan 11 and another instance for vlan 12.

2.單項選擇題

Which MST configuration statement is correct?  ()

A. MST configurations can be propagated to other switches using VTP.
B. After MST is configured on a Switch, PVST+ operations will also be enabled by default.
C. MST configurations must be manually configured on each switch within the MST region.
D. MST configurations only need to be manually configured on the Root Bridge.
E. MST configurations are entered using the VLAN Database mode on Cisco Catalyst switches.

3.單項選擇題By default, all VLANs will belong to which MST instance when using Multiple STP? ()

A. MST00
B. MST01
C. the last MST instance configured
D. none

4.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


6.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

7.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

8.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.

9.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

10.單項選擇題

Switch R1 has been configured with the root guard feature. 
What statement is true if the spanning  tree enhancement Root Guard is enabled? ()

A. If BPDUs are not received on a non-designated port, the port is moved into the STP loop- inconsistent blocked state
B. IF BPDUs are received on a PortFast enabled port, the port is disabled.
C. If superior BPDUs are received on a designated port, the interface is placed into the root- inconsistent blocked state.
D. If inferior BPDUs are received on a root port, all blocked ports become alternate paths to the  root bride.

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