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STP

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Dec 1, 2017.

Contents

  1. Objectives
  2. Key Terms
  3. Introduction (3.0.1.1)
  4. Spanning Tree Concepts (3.1)
  5. Varieties of Spanning Tree Protocols (3.2)
  6. Spanning Tree Configuration (3.3)
  7. Summary (3.4)
  8. Practice
  9. Check Your Understanding Questions

Chapter Description

Network redundancy is a key to maintaining network reliability. In this sample chapter from Scaling Networks v6 Companion Guide, explore potential redundancy problems, symptoms, and protocols to manage them.

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Check Your Understanding Questions

Complete all the review questions listed here to test your understanding of the topics and concepts in this chapter. The appendix “Answers to ‘Check Your Understanding’ Questions” lists the answers.

    1. What could be the effect of duplicate unicast frames arriving at a destination device due to multiple active alternative physical paths?

    1. Application protocols malfunction.

    2. Frame collisions increase.

    3. The number of broadcast domains increases.

    4. The number of collision domains increases.

    2. What additional information is contained in the 12-bit extended system ID of a BPDU?

    1. IP address

    2. MAC address

    3. Port ID

    4. VLAN ID

    3. Which three components are combined to form a bridge ID? (Choose three.)

    1. Bridge priority

    2. Cost

    3. Extended system ID

    4. IP address

    5. MAC address

    6. Port ID

    4. Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?

    1. Alternate port

    2. Designated port

    3. Disabled port

    4. Root port

    5. Which is the default STP operation mode on Cisco Catalyst switches?

    1. MST

    2. MSTP

    3. PVST+

    4. Rapid PVST+

    5. RSTP

    6. What is an advantage of PVST+?

    1. PVST+ optimizes performance on the network through autoselection of the root bridge.

    2. PVST+ optimizes performance on the network through load sharing.

    3. PVST+ reduces bandwidth consumption compared to traditional implementations of STP that use CST.

    4. PVST+ requires fewer CPU cycles for all the switches in the network.

    7. In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)

    1. Blocking

    2. Disabled

    3. Forwarding

    4. Learning

    5. Listening

    8. Which STP priority configuration would ensure that a switch would always be the root switch?

    1. spanning-tree vlan 10 priority 0

    2. spanning-tree vlan 10 priority 4096

    3. spanning-tree vlan 10 priority 61440

    4. spanning-tree vlan 10 root primary

    9. To obtain an overview of the spanning-tree status of a switched network, a network engineer issues the show spanning-tree command on a switch. Which two items of information does this command display? (Choose two.)

    1. The IP address of the management VLAN interface

    2. The number of broadcasts received on each root port

    3. The role of the ports in all VLANs

    4. The root bridge BID

    5. The status of native VLAN ports

    10. Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)

    1. Implementing VLANs to contain broadcasts

    2. Link-state dynamic routing that provides redundant routes

    3. Redundant links between Layer 2 switches

    4. Removing single points of failure with multiple Layer 2 switches

    5. Static default routes

    11. What value determines the root bridge when all switches connected by trunk links have default STP configurations?

    1. Bridge priority

    2. Extended system ID

    3. MAC address

    4. VLAN ID

    12. Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)

    1. Bridge ID

    2. Edge port

    3. Extended system ID

    4. PortFast

    5. PVST+

    13. Which Cisco switch feature ensures that configured switch edge ports do not cause Layer 2 loops if a port is mistakenly connected to another switch?

    1. BPDU guard

    2. Extended system ID

    3. PortFast

    4. PVST+

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