17 - Spanning Tree Part 1 Flashcards

1
Q

‘Classic’ Spanning Tree Protocol is IEEE […]

A

802.1D

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2
Q

Cisco switches use a version of STP called […], which runs a separate spanning tree instance in each VLAN.

A

PVST (Per-Vlan Spanning Tree)

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3
Q

Do all switches run STP by default?

A

Yes

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4
Q

How many root bridges are elected in STP?

A

One

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5
Q

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

A

broadcast storm

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6
Q

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

A

Root bridge only

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7
Q

Interface Speed: 1 Gbps
802.1D STP cost: […]

A

4

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8
Q

Interface Speed: 10 Gbps
802.1D STP cost: […]

A

2

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9
Q

Interface Speed: 10 Mbps
802.1D STP cost: […]

A

100

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10
Q

Interface Speed: 100 Mbps
802.1D STP cost: […]

A

19

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11
Q

Interface Speed: […]
802.1D STP cost: 100

A

10 Mbps

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12
Q

Interface Speed: […]
802.1D STP cost: 19

A

100 Mbps

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13
Q

Interface Speed: […]
802.1D STP cost: 2

A

10 Gbps

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14
Q

Interface Speed: […]
802.1D STP cost: 4

A

1 Gbps

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15
Q

STP Designated ports are in a […] state.

A

forwarding

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16
Q

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

17
Q

STP root port selection:
1: Lowest […]
2: Lowest […]
3: Lowest […]

A
  1. root cost
  2. neighbor bridge ID
  3. neighbor port ID
18
Q

STP Root ports are in a […] state.

A

forwarding

19
Q

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

A

designated

20
Q

STP: The default bridge priority is […] (not including Extended System ID)

21
Q

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

22
Q

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

A

designated

23
Q

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

A

collision domain

24
Q

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

25
The messages sent by STP switches are called:
BPDUs (Bridge Protocol Data Units)
26
The STP bridge priority can be changed in units of [...]
4096 Possible values (you don't have to memorize these!): 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, or 61440
27
Three fields of the STP Bridge ID: [...] (4 bits) Extended System ID (12 bits) MAC Address (48 bits)
Bridge Priority
28
Three fields of the STP Bridge ID: Bridge Priority (4 bits) [...] (12 bits) MAC Address (48 bits)
Extended System ID (VLAN ID)
29
Three fields of the STP Bridge ID: Bridge Priority (4 bits) Extended System ID (12 bits) [...] (48 bits)
MAC Address
30
Three fields of the STP Bridge ID: Bridge Priority (4 bits) Extended System ID (12 bits) MAC Address ([...] bits)
48
31
Three fields of the STP Bridge ID: Bridge Priority (4 bits) Extended System ID ([...] bits) MAC Address (48 bits)
12
32
Three fields of the STP Bridge ID: Bridge Priority ([...] bits) Extended System ID (12 bits) MAC Address (48 bits)
4
33
What does BPDU stand for?
Bridge Protocol Data Unit
34
What does PVST stand for?
Per-VLAN Spanning Tree
35
When a switch rapidly and continuously updates a MAC address in its MAC address table, alternating between different interfaces, this is known as [...]
MAC address flapping
36
Which field in the STP BPDU is used to elect the root bridge?
Bridge ID field