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Advanced Networking > STP > Flashcards

STP Flashcards

1
Q

BPDU guard should be implemented on what kind of port?:

A

access port

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2
Q

Root guard should be implemented on what kind of port?:

A

Designated port

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3
Q

Loop guard should be implemented on what kind of port?:

A

root and alternate ports

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4
Q

Unidirectional link detection should be implemented on what kind of port?:

A

all ports!

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5
Q

Portfast configured ports can receive BPDUs

A

False

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6
Q

What happens when a portfast-enabled interface receives a BPDU?:

A

interface shuts down and goes into “err-disable” state.

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7
Q

How to you bring up a shutdown, err-disabled interface?:

A

Shut then no shut the interface to bring it back up

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8
Q

Enabling BPDU guard on an interface has the same effect as disabling STP

A

True

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9
Q

What happens if an interface is configured to automatically recover an err-disabled port, but the invalid configuration that disabled the port is still present on the network?

A

The interface will go back to “err-disable” mode and must be manually recovered

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10
Q

BPDU’s are sent on all ports, even with portfast enabled

A

True

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11
Q

what effect does BPDU filtering have?:

A

prevents a switch from sending BPDU’s to portfast-enabled interfaces. it will ignore any BPDU’s it sees

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12
Q

What happens when a root guard-enabled interface receives BPDU’s that are superior to what the current root bridge is sending?:

A

the interface is put in a “root-inconsistent” state

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13
Q

interfaces in the “root-inconsistent” state will recover automatically once the offending BPDU packets stop

A

True

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14
Q

What happens when BPDU’s are not received on a non-designated port (root or blocked port) when Loopguard is enabled?

A

interface is put into “loop-inconsistent” state and logs the messages- it will recover automatically

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15
Q

What effect does loop guard have on non-designated (root or blocked) ports?:

A

prevents a non-designated port from becoming designated

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16
Q

Portfast should be enabled on what kinds of interfaces?:

A

edge interfaces – interfaces that connect to a user

17
Q

What is the main purpose of Multiple Spanning Tree (MST)?:

A

reduce total number of spanning tree instances, which reduces the CPU cycles of the switch

18
Q

MST uses the same convergence mechanism as RSTP

A

True

19
Q

How many RSTP instances can you have?:

A

16

20
Q

MST instances run RSTP for fast convergence

A

True

21
Q

How does MST operate?:

A

MST enables you to build multiple spanning trees over trunks by grouping VLANs and associating them with spanning-tree instances.
Each instance can have a topology independent of other spanning-tree instances

22
Q

The default MST instance, MST 0, can be deleted

A

False

23
Q

what does the following command do?:

spanning-tree mst 1 root primary

A

assigns a root bridge and makes the local switch the primary switch for MST instance 1

24
Q

for proper MST functionality, what must be the same across an MST instance?:

A
  • revision number
  • name
  • VLAN to MST instance mapping
25
Q

What is the IEEE name for the STP protocol?:

A

802.1D

26
Q

What is the IEEE name for the MST protocol?:

A

802.1s

27
Q

What is the IEEE name for the RSTP protocol?:

A

802.1w

28
Q

What are the STP port states?:

A
  • blocked
  • disabled
  • listening
  • learning
  • forwarding
29
Q

What are the STP port types?:

A
  • root port – there should only be one per vlan on a switch
  • designated port – there should only be one on a segment/link
  • blocking port
30
Q

What types of BPDU’s (bridge protocol data unit) are there?:

A
  • configuration BPDU
  • topology change notification BPDU
31
Q

What state are all ports in on a root switch?

A

designated forwarding

32
Q

What is the STP bridge priority default value?

A

32,768

33
Q

What is the STP system ID extension?

A

a 12-bit value that indicates the VLAN that the BPDU correlates to

34
Q

What is the STP default Hello time?

A

2 seconds

35
Q

What is the STP default Listening and Learning time?

A

15 seconds

36
Q

What is the STP Bridge ID?

A

a combination of the root bridge MAC address, system ID, and bridge extension

Advanced Networking (7 decks)

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