CCNP Exam Questions... Help Required

Unanswered Question
Nov 8th, 2007

Please help me with the following questions.

1) You have noticed a large number of topology changes in the Rapid

Spanning Tree Protocol network. Which statement is true about RSTP topology

changes?

A. Only nonedge ports moving to the blocking state generate a TC BPDU.

B. Any loss of connectivity generates a TC BPDU.

C. Any change in the state of the port generates a TC BPDU.

D. Only nonedge ports moving to the forwarding state generate a TC BPDU.

E. If either an edge port or a nonedge port moves to a block state, then a TC BPDU is

generated.

F. None of the above.

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2) A change in the spanning tree network is being propagated to all STP

devices. How are STP timers and state transitions affected when a topology change

occurs in an STP environment?

A. All ports will temporarily transition to the learning state for a period equal to the max

age timer plus the forward delay interval.

B. The default hello time for configuration BDPUs will be reduced for the period of the

max age timer.

C. The default aging time for MAC address entries will be reduced for a period of the

max age timer plus the forward delay interval.

D. All ports will transition temporarily to the learning state for a period equal to the

forward delay interval.

E. None of the above.

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3) What is the purpose of MST, according to the IEEE 802.1s standard?

A. It is the spanning-tree implementation used by non-Cisco 802.1Q switches.

B. It runs a separate instance of STP for each VLAN.

C. It allows a VLAN bridge to use multiple spanning trees to prevent Layer 2 loops.

D. It creates a single loop-tree structure that spans the entire Layer 2 network.

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4) A Company 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 above

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5) The following was configured on a Host switch:

Host(config) # spanning-tree portfast bpdufilter default

What is the effect of this configuration command?

A. If BPDUs are received by a port configured for PortFast, they are ignored and none are

sent.

B. The command will enable BPDU filtering on all ports regardless of whether they are

configured for BPDU filtering at the interface level.

C. If BPDUs are received by a port configured for Portfast, the port will transition to

forwarding state.

D. If BPDUs are received by a port configured for PortFast, then PortFast is disabled and

the BPDUs are processed normally.

E. None of the above.

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6) While logged in to switch A you see the following output:

SPANTREE-2-LOOPGUARDBLOCK: No BPDUs were received on port 3/2 in vlan 3.

Moved to loop-inconsistent state.

Which action could have caused the following output to appear on a switch?

A. The switch is configured with Loop Guard and stops receiving BPDUs.

B. The switch is configured with PortFast and starts receiving BPDUs

C. The switch is configured with Loop Guard and stops receiving superior BPDUs

D. The switch is configured with Loop Guard and starts receiving inferior BPDUs

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Kevin Dorrell Thu, 11/08/2007 - 03:41

Without knowing what level your knowledge is at, it is difficult to know at what level to pitch a response. I might go right over your head, or I might be talking down to you. Or I might not address any difficulties you are experiencing, so I would be wasting time.

I suggest that you attempt an answer to each question, explain your reasoning, and we can use that as a basis for discussion. That would help us identify any problems you are having with the subject matter.

Kevin Dorrell

Luxembourg

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