Network Configuration and Troubleshooting Part 5

STP Questions Question 1 Which command does a network engineer use to verify the spanning-tree status for VLAN 10? A. switch# show spanning-tree vlan 10 Question 2 Refer to the exhibit. f1/0 and f1/1 have the same end-to-end path cost to the designated bridge. Which action is needed to modify the Layer 2 spanning-tree network so that traffic for PC1 VLAN from switch SW3 uses switchport f1/1 as a primary port? C. Modify the spanning-tree port-priority on SW2 f1/1 to 0 and f1/0 to 16. Question 5 A network engineer is trying to deploy a PC on a network. The engineer observes that when the PC is connected to the network, it takes 30 to 60 seconds for the PC to see any activity on the network interface card. Which Layer 2 enhancement can be used to eliminate this delay? C. Configure spanning-tree portfast. Question 6 An administrator recently configured all ports for rapid transition using PortFast. After testing, it has been determined that several ports are not transitioning as they should. What is the reason for this? C. STP is unable to achieve rapid transition for trunk links. Question 7 Pilot testing of the new switching infrastructure finds that when the root port is lost, STP immediately replaces the root port with an alternative root port. Which spanning-tree technology is used to accomplish backup root port selection? D. UplinkFast Question 3 Refer to the exhibit. Why would the switch be considered as a root bridge? D. The switch priority value is zero, it has the lowest priority value for VLAN 1. uestion 4 Refer to the exhibit. All ports are members of VLAN 10. Considering the default cost of upstream bridges to the root bridge is equal, which option will be the new root port for VLAN 10? D. interface f0/21 Question 8 A network engineer must adjust the STP interface attributes to influence root port selection. Which two elements are used to accomplish this? (Choose two) A. port-priority B. cost C. forward-timers D. link type E. root guard Question 9 For client server failover purposes, the application server team has indicated that they must not have the standard 30 second delay before their switchport enters a forwarding state. For their disaster recovery feature to operate successfully, they require the switchport to enter a forwarding state immediately. Which spanningtree feature satisfies this requirement? D. Spanning-Tree PortFast Question 10 Which two options are two results of using the command spanning-tree vlan 50 root primary within a spanning-tree network under global configuration? (Choose two) A. Spanning tree determines the priority of the current root for VLAN 50 and reduces the priority of the local switch to a lower value. D. All ports that are configured on the current switch with VLAN 50 transition to designated ports. Question 11 An access switch at a remote location is connected to the spanning-tree root with uplinks. A network engineer notices that there are issues with the physical cabling of the current root port. The engineer decides to force the secondary link to be the desired forwarding root port. Which action accomplishes this task? C. Adjust the secondary link to have a lower priority than the primary link. Question 12 A network engineer wants to make sure that an access switch will never become a Spanning Tree root for VLAN 5. What action will accomplish this task? A. adjust STP priority to the maximum value Question 1 In which two ways are IEEE STP BPDUs forwarded if VLAN 99 is configured as native? (Choose two) A. VLAN 1 STP BPDUs are sent untagged on VLAN 99 D. VLAN 1 STP BPDUs are sent tagged on VLAN 1 Question 2 About Spanning-Tree. (exhibit is missing) spanning-tree extend system-id spanning-tree mode PVST+ spanning-tree backbonefast The question was something like what does the configuration do? C. It enables the switch to set dynamic extended System IDs. Question 3 Refer to the exhibit. (Picture was showing from CLI “show spanning-tree vlan xx” that running on mode rapid-pvst). If you have a new switch (that runs spanning-tree mode pvst+) connect to the exist switch, which statement is true? B. It will work, the new switch will communicate exist switch with PVST+ Question 4 Refer to the exhibit. Which two statements about the spanning-tree operation of this switch are true? (Choose two) A. The switch is operating in the default Cisco spanning-tree mode B. The spanning-tree operation mode for this switch is PVST+ Question 5 What would happen if you typed “spanning-tree portfast trunk” and the port received BPDU? D. the port will disable the PortFast feature Question 6 Question about configuring VLAN 10 root bridge with spanning-tree switch priority. (Choose two) A. spanning-tree vlan 10 root primary B. spanning-tree vlan 10 priority 4096 Question 1 Core switch is connected to 2 distribution switches which are connected to two access switches. PC1 is connected to DSW1 and DSW2 root bridge. Link connected from PC1 to DSW2 is 4Gbps and DSW1 is 10gbps. There is an EtherChannel trunk between DSW1 and DSW2. Default port priority is configured. Change in port priority so traffic goes through DSW1 to DSW2. (Choose two) B. DSW1: interface g1/0 E. DSW1: spanning-tree port priority 0 Question 2 What statement is true about PVST? A. PVST+ is the default STP mode on Cisco switches Question 3 Your manager asked you to make every port on your switch bypass the normal spanning-tree timers which includes your uplink to other switches. What two commands can you apply on the interfaces? (Choose two) A. spanning-tree portfast D. spanning-tree portfast trunk Question 4 What keyword in macro command is used to configure a root bridge and automatically adjust STP timers? A. root primary Question 5 Diagram is: with 1 core, 2 DSW connected with EtherChannel, 2 ALSW, 2 PCs per ALSW. Per diagram current root for VLAN 10 is DSW2. Question is how to make DSW1 the primary root for VLAN 10. (Choose two) B. DSW1: change bridge priority to 4096 (lowest) E. DSW1: change bridge priority but command is priority root Question 6 Refer to the exhibit. Which two commands ensure that DSW1 becomes root bridge for VLAN 10 and 20? (Choose two) B. spanning-tree mst 1 root primary D. spanning-tree mst 1 priority 4096 Question 7 What statements about STP path cost are true? (Choose two) C. MST uses long path cost D. Default path cost is short Question 8 Which two commands enable loop guard on a Cisco switch? (Choose two) A. Switch(config)# spanning-tree loopguard default B. Switch(config-if)# spanning-tree guard loop Question 9 What is the default value for spanning-tree port-priority? A. 128 Question 10 Refer to the exhibit. DSW1 is connected to DSW2 with 10Gbps link and to ASW1 with 10Gbps link. DSW2 is connected to ASW1 with 1Gbps link. What is the path for traffic sourced from a PC connected to ASW1 to reach the Core? B. ASW1 to DWS2 to core uestion 11 Refer to the exhibit. Which statement describes the result if a switch that is running PVST+ is added to this network? B. Spanning tree continues to operate in Rapid PVST+ on DSW2 and the new switch operates in PVST+ uestion 12 Refer to the exhibit. What is the effect of the given configuration? spanning-tree extend system-id spanning-tree mode pvst spanning-tree backbonefast C. It enables spanning-tree to create dynamic system IDs. Question 13 Which keyword can be applied to the spanning-tree priority command that allows the IT department to adjust the timers based on the number of switches between any two end stations? D. diameter Question 13 Which keyword can be applied to the spanning-tree priority command that allows the IT department to adjust the timers based on the number of switches between any two end stations? D. diameter Question 2 When a Layer 2 EtherChannel is configured, which statement about interaction with the Spanning Tree Protocol is true? B. Spanning Tree uses the port channel for forwarding. Question 3 A question about root path election. Which is the parameter to elect the root port and root path? A. interface bandwidth Question 4 Two switches had two redundant links between them. An interface on the primary link has a problem and the admin wants to move the traffic to the other link. What action must he perform? A. Change priority for secondary connection to a lower value than the primary. Question 5 Refer to the exhibit. Which two commands ensure that DSW1 becomes root bridge for VLAN 10? (Choose two) A. DSW2(config)#spanning-tree vlan 10 priority 61440 D. DSW1(config)#spanning-tree vlan 10 priority root Question 6 A question with an exhibit of 5 switches and they mention there are switch priorities for each switch. It is asking for new VLAN added onto the switches. Which switch will become the root bridge? (There was a switch, switch B, with a priority of 8192. All other switch priorities were higher than 8192.) B. Switch B Question 7 Which two options are two results of using the command spanning-tree vlan 50 root primary within a spanning-tree network under global configuration? A. Spanning tree determines the priority of the current root for VLAN 50 and reduces the priority of the local switch to a lower value. D. All ports that are configured on the current switch with VLAN 50 transition to designated ports. Question 8 Which command apply fast forwarding on all ports? B. spanning-tree portfast default Question 9 Which command disables STP on multiple interfaces? A. no spanning-tree vlan 10 RSTP Questions Question 1 After the recent upgrade of the switching infrastructure, the network engineer notices that the port roles that were once “blocking” are now defined as “alternate” and “backup”. What is the reason for this change? A. The new switches are using RSTP instead of legacy IEEE 802.1D STP. Question 2 What happens on a Cisco switch that runs Cisco IOS when an RSTP-configured switch receives 802.1d BPDU? A. 802.1d does not understand RSTP BPDUs because they are different versions, but when a RSTP switch receives an 802.1d BPDU, it responds with an 802.1d BPDU and eventually the two switches run 802.1d to communicate. Question 3 Which statement is true about RSTP topology changes? D. Only nonedge ports moving to the forwarding state generate a TC BPDU. Question 4 RSTP is running on a switch while PVST+is running on another switch in a network. What will happen when they are connected? A. Both will run PVST+ Question 5 Relationship between RSTP and spanning-tree? A. RSTP is compatible with STP Question 5 Relationship between RSTP and spanning-tree? B. RSTP is not backward compatible with STP MST Questions Question 1 A network engineer is setting up a new switched network. The network is expected to grow and add many new VLANs in the future. Which Spanning Tree Protocol should be used to reduce switch resources and managerial burdens that are associated with multiple spanning-tree instances? C. MST Question 2 When two MST instances (MST 1 and MST 2) are created on a switch, what is the total number of spanning-tree instances running on the switch? C. 3 Question 3 To follow the Layer 2 switching guidelines, a network engineer decides to create a separate spanning tree for every group of 10 VLANs. Which version of spanning tree is appropriate to meet the company policy? C. MST Question 4 Question about what does MST do? (Question looks incomplete) D. enable RSTP and uses BPDU type 2 Question 5 Which two statements about MST are true? (Choose two) C. It is vendor neutral E. It can map multiple VLANs to a single STP instance BPDUGuard & BPDUFilter Question 1 When you connect an internal switch to an upstream provider switch, which feature is most appropriate to implement to avoid potential broadcast storms? A. BPDU Filter Question 2 Refer to the exhibit. DSW2# *Mar 3 09:33:23.234: #SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port Fa1/0/7 with BPDU Guard enabled. Disabling port. *Mar 3 09:33:23.234: %PM-4-ERR_DISABLE: bpduguard error detected on Fa1/0/7, putting Fa1/0/7 in err-disable state *Mar 3 09:33:23.678: %SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port Fa1/0/7 with BPDU Guard enabled. Disabling port. *Mar 3 09:33:23.679: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/7, changed state to down *Mar 3 09:33:23.701: %LINK-3-UPDOWN: Interface FastEthernet1/0/7, changed state to down An engineer entered the no spanning-tree bpduguard enable on interface fa1/0/7 command. Which statement describes the effect of this command? A. Fa1/0/7 remains in err-disabled state until the shutdown/no shutdown command is entered in the interface configuration mode Question 3 Question about port which was put into error disabled state. It had BPDU guard configured and received BPDU. Now admin has entered “no spanning-tree bpduguard enable” command. How can the port be brought back to operational status? A. shutdown + no shutdown Question 4 What is the effect of configuring the following command on a switch? Switch(config)# spanning-tree portfast bpdufilter default A. If BPDUs are received by a port configured for PortFast, then PortFast is disabled and the BPDUs are processed normally. Question 5 A network engineer is installing a switch for temporary workers to connect to. The engineer does not want this switch participating in Spanning Tree with the rest of the network; however, end user connectivity is still required. Which spanning-tree feature accomplishes this? E. BPDUfilter Question 6 Switch(config)#spanning-tree portfast default %Warning: this command enables portfast by default on all interfaces. You should now disable portfast explicitly on switched ports leading to hubs, switches and bridges as they may create temporary bridging loops. Switch(config)# When troubleshooting a network problem, a network analyzer is connected to Port f0/1 of a LAN switch. Which command can prevent BPDU transmission on this port? A. spanning-tree portfast bpdufilter default Question 7 Which results happens when a nontrunking port that is configured with BPDU guard is connected to a device that is transmitting? B. The port is error-disabled Question 8 Which STP feature is used to monitor BPDU traffic and enable STP to transition between states? A. BPDU Filter