Ben Piper - CCNP Enterprise Certification Study Guide - Implementing and Operating Cisco Enterprise Network Core Technologies

Exercise 2.4

On the switch that's the root for VLAN 100, prune VLAN 100 from all trunks. What happens?

Exercise 2.5

Locate a blocked port in the VLAN 200 topology. Unblock this port using whatever means you wish. (Hint: Try modifying port priority).

Exercise 2.6

Configure MST on the switches. Place VLANs 100 and 200 in MST1.

Exercise 2.7

Take note of the root bridge for MST1. Pick a different switch and make it the root bridge.

You can find the answers in the appendix.

1 Which of the following can reduce the size of a broadcast domain? (Choose two.)Prune VLANsUse 802.1Q trunksUse routed instead of switched interfacesTag the native VLAN

2 You have three switches connected to VLAN 50. They're all running Spanning Tree and have the following base MAC addresses:SW1 0010.84b0.ee30SW2 007c.5d8a.e100SW3 0084.8ede.fdd0Which of the following will be the root for VLAN 50?SW1SW2SW3None of these

3 You have three switches connected to VLAN 10. They have the following base MAC addresses and are set to the default priority:SW1 0010.84b0.ee30SW2 007c.5d8a.e100SW3 0084.8ede.fdd0You plan to add another switch, SW4, to the topology but don't want it to become root. SW4 has a base MAC address of 000c.0f43.01a3. How can you accomplish this?Set SW4's bridge priority to 0Set SW4's bridge priority to 32768Set SW4's bridge priority to 61440Connect SW4 without making any other changes

4 When you enable Spanning Tree on a switch, what does it advertise as the root bridge?The 0000.0000.0000 addressThe highest root bridge ID it receivesThe first root ID it receivesIts own bridge ID

5 How does a switch calculate the lowest cost to the root bridge?Adding its own bridge priority to the bridge priority it receives in a BPDUAdding its own interface cost to the cost it receives in a BPDUAdding its own port priority to the port priority it receives in a BPDUUsing the path via the bridge with the lowest bridge ID

6 You have a switch running IOS 12.4. Which global configuration command will ensure Rapid Spanning Tree is enabled for VLAN 1?spanning-tree rapid-pvstspanning-tree mode pvstspanning-tree mode rapid-pvstspanning-tree vlan 1 mode rapid-pvst

7 How frequently does a switch running Rapid Spanning Tree send configuration BPDUs?Every 1 secondEvery 2 secondsEvery 5 secondsEvery 15 seconds

8 What's the difference between the transmitting bridge ID and the root bridge ID? (Choose two.)The transmitting bridge ID contains information about the switch that sent the BPDU.The transmitting bridge ID doesn't contain any information about the root.The root bridge ID contains the base MAC address of the root bridge.The root bridge ID contains a MAC address based on one of the root bridge's interfaces.

9 You have three connected switches with the following bridge priorities:SW1: 32788SW2: 32770SW3: 36885There are no other switches in this topology. Which of the following can you conclude from this information? (Choose two.)SW2 is the root for VLAN 20.SW1 is the root for VLAN 20.SW2 is in VLAN 2.SW3 will never be the root.

10 Consider the following two switches: SW1 has a base MAC address of 0000.1234.ABC9 with a bridge priority of 0. SW2 has a base MAC of 0000.1234.ABCA with a priority of 0. If both switches are placed in the same VLAN, which will become the Spanning Tree root?SW1SW2NeitherBoth

11 Switch SW1 is running RPVST+ on VLAN 1 and is the root. It's connected to SW2, which has VLAN 1 mapped to the MST1 instance. You want to add VLAN 2 to both switches and make SW2 the root for VLAN 2 without impacting VLAN 1. How can you accomplish this?Make SW2 the root for MST0Map VLAN 2 to MST1Map VLAN 2 to MST0Make SW1 the root for MST1

12 Which of the following must be the same on all switches in order for them to be in the same MST region? (Choose two.)Trunk encapsulationRegion nameAllowed VLANsVLAN-to-instance mappings

13 Which of the following MST configuration commands will map VLANs 100, 400, and 900 to MST3?instance 100,400,900 vlan 3instance 3 vlan 100,400,900spanning-tree mst 1 vlan 100,400,900vlan 100,400,900 instance 3

14 You attempted to configure MST to map VLAN 2 to MST2. However, running show spanning-tree mst 2 gives the error No mst information available for instance(s) 3. What are two possible explanations?You used the wrong show command. Try show spanning-tree vlan 2 instead.VLAN 2 isn't configured on the switch.You failed to type exit in MST configuration mode to save your changes.You failed to issue a write memory command after making the changes.

15 SW1 is running MST and has VLANs 2 through 10 mapped to MST10. SW1 is connected to SW2, which is running RPVST+. There are no physical loops in the topology. All of SW1's ports are forwarding in all VLANs. Which of the following is true? (Choose two.)SW1 is the root for VLAN 1.SW1 is the root for VLAN 2.SW2 is the root for VLAN 1.SW2 is the root for VLAN 2.

16 You want to ensure that a switch always remains root. Which of the following Spanning Tree extensions should you configure?BPDU GuardBPDU FilterRoot Filter

17 Which of the following Spanning Tree extensions can prevent loops caused by a user plugging a hub into a network jack in their cubicle?Loop GuardBPDU FilterBPDU GuardRoot Guard

18 What command provides the simplest way to enable BPDU Guard on all interfaces that are connected to user workstations?The global configuration command errdisable recovery cause bpduguardThe global configuration command spanning-tree bpduguard enableThe interface command spanning-tree bpduguard enableThe global configuration command spanning-tree portfast edge bpduguard default

19 You want to configure UDLD on a pair of switches connected by fiber-optic cable. In the event of a unidirectional link, you want to ensure that no switches block any ports. Which UDLD mode should you configure, and which command should you use? (Choose two.)udld portudld port aggressiveNormal modeAggressive mode

20 Which are true regarding UDLD and Loop Guard? (Choose three.)Loop Guard disables ports on a per-VLAN basis.Loop Guard can be configured to take no action in response to a loop.UDLD can be configured to take no action in response to a loop.UDLD can stop all traffic on an interface.

21 You need to configure an 802.1Q trunk between two switches, SW1 and SW2. Which of the following interface commands, if configured on each switch, will result in a working 802.1Q trunk? (Choose two.)switchport mode trunk onswitchport trunk encapsulation dot1qswitchport mode dynamic autoswitchport mode dynamic desirableswitchport trunk encapsulation negotiate

22 You've inherited a large network with several hundred switches. You're not using VLAN 1, but it's active on all trunks as the native VLAN. How can you remove it from all trunks? (Choose two.)Enable native VLAN taggingDisable native VLAN taggingRemove VLAN 1 from all switchesPrune VLAN 1 from all trunksShut down VLAN 1 on all switches

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