642-811 Building Cisco Multilayer Switched Networks (BCMSN) Training Boot Camp

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642-811 Building Cisco Multilayer Switched Networks (BCMSN)

Note 1: 642-811 Exhibit and all related diagrams are not shown in demo questions.
Note 2: 642-811 Answers are not shown in demo questions.
Exhibits and Answers are only provided in the Full Version.

Demo Question 8.

Exhibit EliteCertify 1#show spanning-tree vlan 200 VLAN200 Spanning tree enabled protocol ieee Root ID Priority 32968 Address 000c.ce29.ef00 Cost 19 Port 2 (FastEthernet0/2) Hello time 10 Sec Max Age 20 sec Forward Delay 30 sec Bridge ID Priority 32968 (priority 32768 sys-id-ext 200) Address 000c.ce2a.4180 Hello Time 2 sec Max Age 20 Sec Forward Delay 15 sec Interface Role Sts Cost PrioNbr Type ---------------------------------------- Fa0/2 Root FWD 19 128.2 P2p Fa0/3 Altn BLK 19 128.3 P2p Based on the show spanning-tree vlan 200 output shown in the exhibit, which two statements about the STP process for VLAN 200 are true? (Choose two)

A. BDPUs will be sent out every two seconds.
B. The time spent in the listening state will be 30 seconds
C. The time spent in the learning state will be 15 seconds
D. The maximum length of time that the BPDU information will be saved is 30 seconds.
E. This switch is the root bridge for VLAN 200.
F. BPDUs will be sent out every 10 seconds.

Display Answer

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Answer: B, F Changing the Spanning Tree Protocol Timers The STP timers (hello, forward delay, and max age) are included in each BPDU. An IEEE bridge is not concerned about its local configuration of the timers value. It will consider the value of the timers contained in the BPDU that it is receiving. Effectively, that means only a timer configured on the root bridge of the STP is important. Obviously, in case you would lose the root, the new root would start to impose its local timer value to the entire network. So, even if it is not required to configure the same timer value in the entire network, it is at least mandatory to configure any timer changes on the root bridge and on the backup root bridge.

Explanation: