Module 3 – Exam 1. Under what two conditions is a TCN BPDU originated by a switch? If the switch has multiple Root Ports Once the Spanning Tree network has converged If the switch transitions a port into the Forwarding state and it has at least one Designated Port If the switch transitions a port from either the Forwarding or Learning states to the Blocking state Question 1 of 21 2. When the udld enable global configuration command is executed, for what type of ports is UDLD enabled? Both Fiber-Optic and Copper Ethernet Ports Fiber-Optic Ethernet Ports Neither Fiber-Optic nor Copper Ethernet Ports Copper Ethernet Ports Question 2 of 21 3. The TCN flag instructs all switches to shorten their MAC address table aging process from the default value of 500 seconds to the current Forward Delay value, which is 15 seconds True False Question 3 of 21 4. What two types of Root Link Querys (RLQs) are used during Backbone Fast operation? RLQ request RLQ response RLQ ack RLQ update RLQ query RLQ reply Question 4 of 21 5. Which of the following statements is TRUE in regards to Configuration BPDUs? A Configuration BPDU is received by a Non-Root Bridge on a Designated Port and forwarded via the Root Port. This is referred to as BPDU propagation. In the Spanning Tree domain, all switches send BPDUs to the STP Broadcast destination address 01-80-C2-00-00-00 A Configuration BPDU is always transmitted away from the Root Bridge to the rest of the switches within the STP domain The Configuration BPDU exchange is used to elect the Root Port on the Root Bridge Following the Configuration BPDU exchange, a Designated Switch is elected for every LAN segment Configuration BPDU are sent by the Designated Switch or Bridge Question 5 of 21 6. Which of the following statements are TRUE in regards to the BPDU Guard and BPDU Filter STP Enhancements? When a port that is configured with the BPDU Filter feature receives a BPDU, it immediately transitions to the errdisable state The BPDU Guard feature effectively disables Spanning Tree on the selected ports The BPDU Guard feature prevents the port from receiving any BPDUs, but does not prevent it from sending them The BPDU Filter feature prevents the port from receiving any BPDUs, but does not prevent it from sending them When a port that is configured with the BPDU Guard feature receives a BPDU, it immediately transitions to the errdisable state The BPDU Filter feature effectively disables Spanning Tree on the selected ports Question 6 of 21 7. What variables determine the topology of an active switched network? The switch is able to regularly receive, process and send BPDUs The port identifier (MAC address of the port) associated with each switch port The unique MAC address (switch identifier) that is associated with each switch All links are bidirectional and can both send and receive BPDUs The path cost to the Root Bridge associated with each switch port Question 7 of 21 8. Which statements pertaining to Loop Guard are FALSE? The Loop Guard feature prevents a port from becoming a Root Port, thus ensuring that the port is always a Designated Port Loop Guard can be enabled on a switch that also has Root Guard enabled Loop Guard operation is affected by the Spanning Tree timers Loop Guard must be manually enabled on each individual port Question 8 of 21 9. A switch has just booted up. By default, the switch will send out BPDUs. To which adress will these BPDUs be sent? It will send BPDUs to the STP Multicast destination address 01-80-C2-00-00-00 It will send BPDUs to the STP Multicast destination address 00-05-32-f5-5b-01 It will send BPDUs to the STP Multicast destination address 00-0d-bd-06-41-00 It will send BPDUs to the STP Multicast destination address 01-00-0C-CC-CC-CC Question 9 of 21 10. What assumptions does STP make about the network? The switch is able to regularly receive, process and send BPDUs That UplinkFast is enabled on all uplinks That PortFast is enabled on all access ports All links are bidirectional and can both send and receive BPDUs The VTP domain is the same on all switches Question 10 of 21 11. Click on the Exhibit. Based on the parameters illustrated in the Exhibit, which switch will be elected Root Bridge for VLAN 1? Switch 1 will be elected Root Bridge Switch 2 will be elected Root Bridge Question 11 of 21 12. The Flag field in the Configuration BPDU is used for the Topology Change (TC) and Topology Change Acknowledgement (ACK) flags. What is FALSE in regards to the LSB and MSB? If the Least Significant Bit (LSB) is enabled, this indicates a TCA BPDU If the Most Significant Bit (MSB) is enabled, then it indicates a TCA BPDU If the Least Significant Bit (LSB) is enabled, this indicates a TC BPDU If the Most Significant Bit (MSB) is enabled, then it indicates a TC BPDU Question 12 of 21 13. What is TRUE in regards to Configuration BPDUs with the TCN bit set? The Root Bridge continues to set the TCN flag in all Configuration BPDUs that it sends out for a total of Forward Delay + Maximum Age seconds The Root Bridge continues to set the TCN flag in all Configuration BPDUs that it sends out for a total of Maximum Age + Hello Time The Root Bridge continues to set the TCN flag in all Configuration BPDUs that it sends out for a total of Message Age + Maximum Age The Root Bridge continues to set the TCN flag in all Configuration BPDUs that it sends out for a total of Forward Delay + Message Age Question 13 of 21 14. Which of the following statements about STP timers are TRUE? The default Max Age is based on the IEEE Spanning Tree diameter of 7 switches The Max Age time is set in the BPDU by the Root Bridge and defaults to 15 seconds The Max Age timer displays the age of the Root Bridge BPDU The Message Age value remains the same for all BPDUs that are propagated by all switches in the Spanning Tree domain The IEEE 802.1D standard specifies a default Hello Time value of 20 seconds based on a recommend Spanning Tree diameter of 7 switches When a switch receives a BPDU, the BPDU contains the Max Age timer, which is set by the Root Bridge and never changes, and the Message Age, which is incremented by all other upstream switches The Root Bridge sends BPDUs with a Message Age value of 1 Question 14 of 21 15. Implementing Spanning Tree Protocol GUARANTEES that a loop-free network topology will be created. True False Question 15 of 21 16. Which of the following statements are FALSE? The primary purpose of the Designated Port is to provide network segment redudancy The primary purpose of the Designated Port is to prevent loops The primary purpose of the Designated Port is to forward traffic to the Root Bridge The primary purpose of the Designated Port is to back up the Root Port Question 16 of 21 17. Which 802.1D timer is modified by every switch that receives and propagates a BPDU? The Max Age The Hello Time The Forward Delay The Message Age Question 17 of 21 18. What standard introduced the extended system ID to conserve MAC addresses, while still allowing for a unique BID for each VLAN? 802.1D 802.1w 802.1t 802.1s Question 18 of 21 19. Click on the Exhibit. What command produced the output illustrated in the Exhibit? The show spanning-tree summary command The spanning-tree rootinconsistent ports command The show spanning-tree guard root command The show errdisable recovery command The show spanning-tree rootguard command The spanning-tree inconsistentports command Question 19 of 21 20. What are the two UDLD modes of operation? Active Mode Normal Mode Default Mode Passive Mode Aggressive Mode Desirable Mode Question 20 of 21 21. With Backbone Fast, when does failover occur? When the switch receives an RLQ Failover occurs when the switch receives an inferior BPDU from its designated bridge When the designated port fails Failover occurs when the switch receives a superior BPDU from its designated bridge Question 21 of 21 Loading…
