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CCNA > STP > Flashcards

STP Flashcards

1
Q

Classic spanning tree IEEE standard

A

802.1D

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2
Q

Root bridge election process

A

Switch with lowest Bridge ID

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3
Q

Default bridge priority (not including extended system Id)

A

32768

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4
Q

Bridge ID structure

A

Bridge priority - 4 bits
Extended system ID - 12 bits
MAC address - 48 bits

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5
Q

STP bridge priority can be changed in units of

A

4096

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6
Q

802.1D 10mbps cost

A

100

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7
Q

802.1D speed for cost of 100

A

10mbps

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8
Q

802.1D 100Mbps cost

A

19

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9
Q

802.1D 19 cost speed

A

100Mbps

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10
Q

802.1D 1 Gbps cost

A

4

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11
Q

802.1D 4 cost speed

A

1gbps

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12
Q

802.1D 10gbps cost

A

2

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13
Q

802.1D 2 cost speed

A

10gbps

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14
Q

STP root port selection

A
  1. Lowest Root cost
  2. Lowest neighbor bridge ID
  3. Lowest neighbor port ID
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15
Q

STP default forward delay timer

A

15 seconds

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16
Q

STP default hello timer

A

2 seconds

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17
Q

STP default max age timer

A

20 seconds (10*hello timer)

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18
Q

PVST+ BPDUs are sent to destination MAC address:

A

0100.0ccc.cccd

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19
Q

Standard STP (NOT PVST) BPDUs are sent to destination MAC address:

A

0180.c200.0000

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20
Q

spanning-treee vlan vlan-id root primary sets the STP priority to […], or 4096 less than the current root’s priority.

A

24576

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21
Q

spanning-tree vlan vlan-id root secondary sets the STP priority to […]

A

28672

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22
Q

Rapid STP is IEEE […]

A

802.1w

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23
Q

Multiple STP is IEEE […]

A

802.1s

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24
Q

What is the protocol version identifier in a rapid STP BPDU?

A

2

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25
Q

What is the protocol version identifier in a classic STP BPDU?

A

0

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26
Q

In RSTP, a switch considers a neighbor lost if it misses […] BPDUs.

A

3

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27
Q

STP Non-Designated ports are in a […] state

A

blocking

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28
Q

STP Root ports are in a […] state.

A

forwarding

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29
Q

STP: There must be one […] port per collision domain.

A

designated

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30
Q

STP: There must be one designated port per […].

A

collision domain

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31
Q

In an 802.1D STP network, which switch(es) send BPDUs?

A

Root bridge only

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32
Q

STP: When a switch is powered on, it assumes the role of […] bridge.

A

root

33
Q

STP Designated ports are in a […] state.

A

forwarding

34
Q

STP: All ports on the root bridge are […] ports (forwarding state)

A

designated

35
Q

STP: The switch with the lowest […] becomes the root bridge.

A

Bridge ID

36
Q

Which field in the STP BPDU is used to elect the root bridge?

A

Bridge ID field

37
Q

How many root bridges are elected in STP?

A

One

38
Q

What does BPDU stand for?

A

Bridge Protocol Data Unit

39
Q

The messages sent by STP switches are called:

A

BPDUs (Bridge Protocol Data Units)

40
Q

Do all switches run STP by default?

A

Yes

41
Q

When a switch rapidly and continuously updates a MAC address in its MAC address table, alternating between different interfaces, this is known as […]

A

MAC address flapping

42
Q

If looped Layer 2 broadcast messages accumulate and congest a network, this is called a […]

A

broadcast storm

43
Q

Configure the STP priority of an interface:
SW1(config-if)# […]

A

spanning-tree vlan vlan-id port-priority priority

44
Q

Configure the STP cost of an interface:
SW1(config-if)# […]

A

spanning-tree vlan vlan-id cost cost

45
Q

Configure the spanning-tree secondary root for a VLAN:
SW1(config)# […]

A

spanning-tree vlan vlan-id root secondary

46
Q

Configure the spanning-tree root for a VLAN:
SW1(config)# […]

A

spanning-tree vlan vlan-id root primary

47
Q

Configure spanning tree in PVST mode:
SW1(config)# […]

A

spanning-tree mode pvst

48
Q

Which STP optional feature shuts down an interface if it stops receiving BPDUs?

A

Loop Guard

49
Q

Which STP optional feature prevents a newly connected switch from becoming the root bridge?

A

Root Guard

50
Q

Enable BPDU Guard on all Portfast-enabled interfaces:
SW1(config)# […]

A

spanning-tree portfast bpduguard default

51
Q

Enable BPDU Guard on a switch port:
SW1(config-if)# […]

A

spanning-tree bpduguard enable

52
Q

SW1(config)# spanning-tree portfast default
This command enables portfast on which ports?

A

All access ports

53
Q

Enable portfast on all access ports on the switch:
SW1(config)# […]

A

spanning-tree portfast default

54
Q

Enable portfast on a switch port:
SW1(config-if)# […]

A

spanning-tree portfast

55
Q

If an interface with […] enabled receives a BPDU from another switch, the interface will be shut down.

A

BPDU Guard

56
Q

[…] allows an STP port to move immediately to the forwarding state.

A

Portfast

57
Q

The STP timers on the […] determine the timers used for all switches in the network.

A

root bridge

58
Q

STP: A blocking interface [can/can’t] move directly to a forwarding state.

A

can’t

59
Q

STP: A forwarding interface [can/can’t] move directly to a blocking state.

A

can

60
Q

STP BPDUs are only forwarded on […] ports.

A

designated

61
Q

STP default max age timer:

A

20 seconds (10*hello timer)

62
Q

STP default hello timer:

A

2 seconds

63
Q

STP: Do interfaces in a Forwarding state learn MAC addresses?

A

Yes

64
Q

STP: Do interfaces in a Forwarding state send/receive BPDUs?

A

Yes

65
Q

STP: Do interfaces in a Forwarding state send/receive regular network traffic?

A

Yes

66
Q

STP: Do interfaces in a Learning state learn MAC addresses?

A

Yes

67
Q

STP: Do interfaces in a Learning state send/receive BPDUs?

A

Yes

68
Q

STP: Do interfaces in a Learning state send/receive regular network traffic?

A

No

69
Q

STP: Do interfaces in a Listening state learn MAC addresses?

A

No

70
Q

STP: Do interfaces in a Listening state send/receive BPDUs?

A

Yes

71
Q

STP: Do interfaces in a Listening state send/receive regular network traffic?

A

No

72
Q

STP default Forward delay timer:

A

15 seconds

73
Q

STP: Do interfaces in a blocking state learn MAC addresses?

A

No

74
Q

STP: Do interfaces in a blocking state receive BPDUs?

A

Yes

75
Q

STP: Do interfaces in a blocking state send BPDUs?

A

No

76
Q

STP: Do interfaces in a blocking state send/receive regular network traffic?

A

No

77
Q

STP: Non-designated ports are in a […] state.

A

Blocking

78
Q

What are the two ‘transitional’ STP port states?

A

Listening, Learning

79
Q

What are the two ‘stable’ STP port states?

A

Blocking, Forwarding

CCNA (37 decks)

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