Exam Prep Questions

Question 1

BPDU hello messages are generated every ___________ seconds.

  • A. 1

  • B. 2

  • C. 15

  • D. 30

A1:

Answer B is correct. BPDU hello messages are generated every 2 seconds. Therefore answers A, C, and D are incorrect.

Question 2

The switch with the _________ is elected as the root.

  • A. Lowest MAC address

  • B. Highest bridge identifier

  • C. Lowest priority

  • D. Lowest bridge identifier

A2:

Answer D is correct. The switch with the lowest bridge ID (priority + MAC address) is chosen as the root. A and C are incorrect because they're missing one of the two bridge ID components. Answer B is incorrect because it is the lowest bridge ID, not the highest.

Question 3

A switch is choosing a root port. Two ports have the same lowest accumulated path cost. Which is the tiebreaker?

  • A. Highest numbered port

  • B. Lowest neighboring bridge ID

  • C. Lowest numbered port

  • D. Lowest port priority

A3:

Answer B is correct. When choosing a root port, the lowest accumulated path cost is used first. If there is a tie, chose the neighboring switch with the lowest bridge ID. If there is still a tie, the port with the lowest priority is chosen, making answer D incorrect. If there is still a tie, choose the lower-numbered port on the switch, making answers A and C incorrect.

Question 4

When choosing a designated port, which switch is used when going through the selection process?

  • A. The higher-modeled switch

  • B. The switch with the highest accumulated path cost

  • C. The switch with the lowest bridge ID

  • D. The switch with the highest priority

A4:

Answer C is correct. When choosing a designated port for a segment, the switch with the lowest accumulated path cost is chosen, making answer B incorrect. If there is a tie, the switch with the lowest bridge ID is chosen, making answer D incorrect. The model of the switch is not taken into consideration, making answer A incorrect.

Question 5

In which port state does the CAM table begin to be built?

  • A. Forwarding

  • B. Learning

  • C. Listening

  • D. Blocking

A5:

Answer B is correct. The switch begins building the CAM table in the learning state. The switch also continues to build the CAM table and forwards user frames in the forwarding state, making answer A incorrect. During the listening and blocking states, the CAM table is not updated, making answers C and D incorrect.

Question 6

It can take up to __________ seconds for STP to converge.

  • A. 2

  • B. 15

  • C. 50

  • D. 60

A6:

Answer C is correct. It can take up to 50 seconds for STP to converge. Answer A is incorrect because this is the BPDU hello timer. Answer B is incorrect because this is the forward delay timer. Answer D is an invalid timer.

Question 7

PVST is supported on __________ trunks.

  • A. ISL

  • B. 802.1Q

  • C. ISL and 802.1Q

A7:

Answer C is correct. PVST is supported on both 802.1Q and ISL trunks. PVST is supported on 802.1Q trunks only if the two connected switches are Cisco switches.

Question 8

Which switch command selects the root switch?

  • A. (config)# spanning-tree priority

  • B. (config-if)# spanning-tree priority

  • C. (config)# spanning-tree bridge-id

  • D. (config)# spanning-tree bridge-priority

A8:

Answer A is correct. To change the priority of a switch that is part of the bridge ID, use the global Configuration spanning-tree priority command. Answer B is incorrect because it is executed at the wrong mode. Answers C and D are incorrect because they are nonexistent commands.

Question 9

With the current 802.1D port cost standard, what is the cost of a Fast Ethernet port?

  • A. 1

  • B. 4

  • C. 10

  • D. 19

A9:

Answer D is correct. The default port cost for a Fast Ethernet port in the current 802.1D standard is 19. Answer A is incorrect because it is the old port cost for a Gigabit Ethernet port. Answer B is incorrect because it is the newer cost for a Gigabit port. Answer C is incorrect because it is the older cost for a Fast Ethernet port.

Question 10

Which switch command displays the STP bridge identifier, as well as STP configuration for interfaces involved in STP?

  • A. show span

  • B. show span-tree

  • C. show spanning-tree

  • D. show stp

A10:

Answer C is correct. Use the show spanning-tree command to view your current STP configuration and operation. Answer A is incorrect because this displays the span feature configuration on your switch. Answers B and D are incorrect because they are nonexistent commands.




BCMSN Exam Cram 2 (Exam Cram 642-811)
CCNP BCMSN Exam Cram 2 (Exam Cram 642-811)
ISBN: 0789729911
EAN: 2147483647
Year: 2003
Pages: 171
Authors: Richard Deal

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