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CCNP 350-401 Encor > Chapter 3. Advanced STP Tuning > Flashcards

Chapter 3. Advanced STP Tuning Flashcards

1
Q

A switch STP Priority can be configured in increments of………..?

A

4096

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2
Q

The priority value of VLAN is between?

A

0 -61,440

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3
Q

The primary keyword set priority to what value?

A

24,576

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4
Q

The secondary keyword sets the priority to what value?

A

28,672

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5
Q

What does the diameter command do in spanning tree protocol?

A

The diameter command makes it possible to tune the spanning tree protocol convergence and modifies the timers.

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6
Q

What is the best way to prevent erroneous devices from taking over the STP root role?

A

Set the priority to zero (0) for the primary root and 4096 for the secondary.

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7
Q

Ideally where can you place a root bridge?

A

Core Switch

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8
Q

Which command set the priority as primary root for VLAN 1?

A

Spanning-tree VLAN 1 root primary.

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9
Q

Which command change the port cost of an interface?

A

Spanning-tree cost 1. Interface configuration mode.

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10
Q

Which command change the port priority of an interface?

A

Spanning-tree port-priority 6. Interface configuration command.

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11
Q

What is the purpose of a Root Guard?

A
  1. It prevents a configured port from becoming a root port.

2. It prevents a downstream switch(Mo’s configured or rogue) from becoming a root bridge in a topology.

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12
Q

Which command configures root guard on a switch interface?

A

Spanning-tree guard root.

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13
Q

What are the benefits of STP Portfast?

A
  1. The STP portfast feature disables TCN generation for access ports.
  2. STP portfast enabled the access ports to bypass the earlier 802.1D STP states(Learning and Listening).
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14
Q

STP Portfast can be enabled globally using the following command?

A

Spanning-Tree portfast default. Global configuration command.

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15
Q

STP portfast can be configured on a specific access port with which command?

A

Spanning-Tree portfast. Interface configuration command.

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16
Q

Portfast can be enabled on a trunk interface using what command?

A

Spanning-tree Portfast trunk.

This command should be used only with ports that are connecting to a single host such as servers.

17
Q

What is a BPDU GUARD?

A

BPDU Guard is a safety mechanism that shuts down ports configured with STP portfast upon receipt of a BPDU.

18
Q

BPDU GUARD is enabled globally on all STP portfast with the command……

A

spanning-tree portfast bpduguard default. Global configuration command.

19
Q

Which command shows detail spanning-tree interface.

A

Show spanning-tree interface g1/0/7 detail.

20
Q

The commands that recover ports that were shut down from BPDU guard…. ?

A

Errdisable recovery cause bodyguard. Global configuration command.

21
Q

The error recovery service operates every 300 seconds. Which command can be used?

A

Errdisable recovery interval 600.

22
Q

What is a bpdu filter?

A

BPDU FILTER simply blocks BPDU from being transmitted out a port. It can be enabled globally or on a specific interface.

23
Q

Which command is used to configure BPDU filter globally?

A

Spanning-tree portfast bpdufilter default.

24
Q

Which command enabled bpdu filter on an interface?

A

spanning-tree bpdufilter enable.

25
Q

Which command can be used to view SPT inconsistent ports ?

A

Show spanning-tree inconsistentports.

26
Q

What is Unidirectional Link Detection(UDLD)?

A

UDLD allows for the bidirectional monitoring of fibre-optic cables.

27
Q

What are the two modes that UDLD operates?

A
  1. Normal mode: if a frame is not acknowledged, the link is considered undetermined and the port remains active.
  2. Aggressive mode: when a frame is not acknowledged, the switch sends another eight packets in 1-second intervals. If those packets are not acknowledged, the port is placed into an error state.
28
Q

How do you enable UDLD on a switch?

A

It is enabled globally with the following command: udld enable aggressive. This enabled UDLD on any small form-factor pluggable (SFP) ports.

29
Q

What are the two types of BPDU?

A
  1. Configuration BPDU

2. Topology Change Notification (TCN)

CCNP 350-401 Encor (5 decks)

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