| Question 1 | BPDU hello messages are generated every ___________ seconds. |
| 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. |
| 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? |
| 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
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| 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
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| 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. |
| 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
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| 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
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| 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? |
| 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
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| 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. |
