Cisco Implementing Cisco Switched Networks Set 2

1.

How are STP timers and state transitions affected when a topology change occurs in an STP environment?

All ports will temporarily transition to the learning state for a period equal to the max age timer plus the forward delay interval. All ports will transition temporarily to the learning state for a period equal to the forward delay interval. The default aging time for MAC address entries will be reduced for a period of the max age timer plus the forward delay interval. The default hello time for configuration BPDUs will be reduced for the period of the max age timer.

2.

What is the result of entering the command spanning-tree loopguard default?

The command enables both loop guard and root guard. The command changes the status of loop guard from the default of disabled to enabled. The command activates loop guard on point-to-multipoint links in the switched network. The command will disable EtherChannel guard.

3.

Examine the diagram. A network administrator has recently installed the above switched network using 3550s and would like to control the selection of the root bridge. Which switch should the administrator configure as the root bridge and which configuration command must the administrator enter to accomplish this?

DSW11(config)# spanning-tree vlan 1 priority 4096

DSW12(config)# set spanning-tree priority 4096

ASW13(config)# spanning-tree vlan 1 priority 4096

DSW11(config)# set spanning-tree priority 4096

DSW12(config)# spanning-tree vlan 1 priority 4096

4.

What must be the same to make multiple switches part of the same Multiple Spanning Tree (MST)?

VLAN instance mapping and revision number VLAN instance mapping and member list VLAN instance mapping, revision number, and member list VLAN instance mapping, revision number, member list, and timers

5.

Which statement correctly describes the Cisco implementation of RSTP?

PortFast, UplinkFast, and BackboneFast specific configurations are ignored in Rapid PVST mode. RSTP is enabled globally and uses existing STP configuration. Root and alternative ports transition immediately to the forwarding state. Convergence is improved by using sub-second timers for the blocking, listening, learning, and forwarding port states.

6.

The network administrator maps VLAN 10 through 20 to MST instance 2. How will this information be propagated to all appropriate switches?

Information will be carried in the RSTP BPDUs. It will be propagated in VTP updates. Information stored in the Forwarding Information Base and the switch will reply on query. Multiple Spanning Tree must be manually configured on the appropriate switches.

7.

Which MST configuration statement is correct?

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

8.

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

It enables a PVST+ instance of 10 for vlan 11 and vlan 12 It enables vlan 11 and vlan 12 to be part of the MST region 10 It maps vlan 11 and vlan 12 to the MST instance of 10. It creates an Internal Spanning Tree (1ST) instance of 10 for vlan 11 and vlan 12 It create a Common Spanning Tree (CST) instance of 10 for vlan 11 and vlan 12

9.

By default, all VLANs will belong to which MST instance when using Multiple STP?

MST00 MST01 the last MST instance configured none

10.

What will occur when a nonedge switch port that is configured for Rapid Spanning Tree does not receive a BPDU from its neighbor for three consecutive hello time intervals?

RSTP information is automatically aged out. The port sends a TCN to the root bridge. The port moves to listening state, The port becomes a normal spanning tree port.

Cisco Implementing Cisco Switched Networks Set 2

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Cisco Implementing Cisco Switched Networks Set 2

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