CCNP SWITCH 642-813 Official Certification Guide (Part II – Chapter 8 Spanning-Tree Configuration)

PARTE II – Building a Campus Network

Chapter 8 – Spanning-Tree Configuration

Este capítulo cubre los siguientes aspectos:

  1. STP Root Bridge
  2. Spanning-Tree Customization
  3. Tuning Spanning-Tree Convergence
  4. Redundant Link Convergence
  5. Monitoring STP

Antes de empezar con el capítulo 8, vamos a realizar un pequeño test que consta de 13 preguntas. Al final de este capítulo pondremos las respuestas correctas.

1. Where should the root bridge be placed on a network?

a. On the fastest switch

b. Closest to the most users

c. Closest to the center of the network

d. On the least-used switch

2. Which of the following is a result of a poorly placed root bridge in a network?

a. Bridging loops form.

b. STP topology can’t be resolved.

c. STP topology can take unexpected paths.

d. Root bridge election flapping occurs.

3. Which of these parameters should you change to make a switch become a root bridge?

a. Switch MAC address

b. Path cost

c. Port priority

d. Bridge priority

4. What is the default 802.1D STP bridge priority on a Catalyst switch?

a. 0

b. 1

c. 32,768

d. 65,535

5. Which of the following commands is most likely to make a switch become the root bridge for VLAN 5, assuming that all switches have the default STP parameters?

a. spanning-tree root

b. spanning-tree root vlan 5

c. spanning-tree vlan 5 priority 100

d. spanning-tree vlan 5 root

6. What is the default path cost of a Gigabit Ethernet switch port?

a. 1

b. 2

c. 4

d. 19

e. 1000

7. What command can change the path cost of interface Gigabit Ethernet 3/1 to a value of 8?

a. spanning-tree path-cost 8

b. spanning-tree cost 8

c. spanning-tree port-cost 8

d. spanning-tree gig 3/1 cost 8

8. What happens if the root bridge switch and another switch are configured with different STP Hello timer values?

a. Nothing—each sends hellos at different times.

b. A bridging loop could form because the two switches are out of sync.

c. The switch with the lower Hello timer becomes the root bridge.

d. The other switch changes its Hello timer to match the root bridge

9. What network diameter value is the basis for the default STP timer calculations?

a. 1

b. 3

c. 7

d. 9

e. 15

10. Where should the STP PortFast feature be used?

a. An access-layer switch port connected to a PC

b. An access-layer switch port connected to a hub

c. A distribution-layer switch port connected to an access layer switch

d. A core-layer switch port

11. Where should the STP UplinkFast feature be enabled?

a. An access-layer switch.

b. A distribution-layer switch.

c. A core-layer switch.

d. All these answers are correct.

12. If used, the STP BackboneFast feature should be enabled on which of these?

a. All backbone- or core-layer switches

b. All backbone- and distribution-layer switches

c. All access-layer switches

d. All switches in the network

13. Which one of the following commands can be used to verify the current root bridge in VLAN 10?

a. show root vlan 10

b. show root-bridge vlan 10

c. show spanning-tree vlan 10 root

d. show running-config

Saludos a tod@s,


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