Jeremy's It Lab CCNA STP Day 20 (Part 1)

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Last updated 6:14 PM on 7/25/26
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36 Terms

1
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'Classic' Spanning Tree Protocol is IEEE [...]

802.1D

2
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Cisco switches use a version of STP called [...], which runs a separate spanning tree instance in each VLAN.

PVST (Per-Vlan Spanning Tree)

3
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Do all switches run STP by default?

Yes

4
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How many root bridges are elected in STP?

One

5
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If looped Layer 2 broadcast messages accumulate and congest a network, this is called a [...]

broadcast storm

6
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In an 802.1D STP network, which switch(es) send BPDUs?

Root bridge only

7
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Interface Speed: 1 Gbps

802.1D STP cost: [...]

4

8
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Interface Speed: 10 Gbps

802.1D STP cost: [...]

2

9
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Interface Speed: 10 Mbps

802.1D STP cost: [...]

100

10
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Interface Speed: 100 Mbps

802.1D STP cost: [...]

19

11
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Interface Speed: [...]

802.1D STP cost: 100

10 Mbps

12
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Interface Speed: [...]

802.1D STP cost: 19

100 Mbps

13
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Interface Speed: [...]

802.1D STP cost: 2

10 Gbps

14
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Interface Speed: [...]

802.1D STP cost: 4

1 Gbps

15
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STP Designated ports are in a [...] state.

forwarding

16
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STP Non-Designated ports are in a [...] state

blocking

17
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STP root port selection:

1: Lowest [...]

2: Lowest [...]

3: Lowest [...]

1. root cost

2. neighbor bridge ID

3. neighbor port ID

18
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STP Root ports are in a [...] state.

forwarding

19
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STP: All ports on the root bridge are [...] ports (forwarding state)

designated

20
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STP: The default bridge priority is [...] (not including Extended System ID)

32768

21
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STP: The switch with the lowest [...] becomes the root bridge.

Bridge ID

22
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STP: There must be one [...] port per collision domain.

designated

23
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STP: There must be one designated port per [...].

collision domain

24
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STP: When a switch is powered on, it assumes the role of [...] bridge.

root

25
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The messages sent by STP switches are called:

BPDUs (Bridge Protocol Data Units)

26
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The STP bridge priority can be changed in units of [...]

4096

27
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Three fields of the STP Bridge ID:

[...] (4 bits)

Extended System ID (12 bits)

MAC Address (48 bits)

Bridge Priority

28
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Three fields of the STP Bridge ID:

Bridge Priority (4 bits)

[...] (12 bits)

MAC Address (48 bits)

Extended System ID (VLAN ID)

29
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Three fields of the STP Bridge ID:

Bridge Priority (4 bits)

Extended System ID (12 bits)

[...] (48 bits)

MAC Address

30
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Three fields of the STP Bridge ID:

Bridge Priority (4 bits)

Extended System ID (12 bits)

MAC Address ([...] bits)

48

31
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Three fields of the STP Bridge ID:

Bridge Priority (4 bits)

Extended System ID ([...] bits)

MAC Address (48 bits)

12

32
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Three fields of the STP Bridge ID:

Bridge Priority ([...] bits)

Extended System ID (12 bits)

MAC Address (48 bits)

4

33
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What does BPDU stand for?

Bridge Protocol Data Unit

34
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What does PVST stand for?

Per-VLAN Spanning Tree

35
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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
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Which field in the STP BPDU is used to elect the root bridge?

Bridge ID field