Module 5 - STP (Part 2)

2

10 Gbps Link Speed has the STP costs of?

4

1 Gbps Link Speed has the STP costs of?

19

100 Mbps Link Speed has the STP costs of?

100

10 Mbps Link Speed has the STP costs of?

True

(T/F) What is not a root port or a designated port becomes an alternate or blocked port

False - All ports on the root bridge are designated ports

(T/F) Not all ports on the root bridge are designated ports

True

(T/F) All ports attached to end devices are designated ports

True

(T/F) If one end of a segment is a root port, the other end is a designated port

Alternate ports

_______ are in discarding or blocking state to prevent loops

- Lowest sender BID

- Lowest sender port priority

- Lowest sender port ID

When a switch has multiple equal-cost paths to the root bridge, the switch will determine a port using the following 3 criteria:

- Hello Timer

- Forward Delay Timer

- Max Age Timer

3 timers of STP convergence

hello time

The _______ is the interval between BPDUs.

forward delay

The _________ is the time that is spent in the listening and learning state

max age

The ________ is the maximum length of time that a switch waits before attempting to change the STP topology

2 seconds

What is the default hello time value?

- Blocking

- Listening

- Learning

- Forwarding

- Disbaled

5 operational port states of STP

Per-VLAN Spanning Tree (PVST)

In ______ versions of STP, there is a root bridge elected for each spanning tree instance

False - STP has now been superseded by the Rapid Spanning Tree Protocol (RSTP)

(T/F) STP has not been superseded by the Rapid Spanning Tree Protocol (RSTP)

STP

This is the original IEEE 802.1D version (802.1D-1998 and earlier) that provides a loop-free topology in a network with redundant links

PVST+

This is a Cisco enhancement of STP that provides a separate 802.1D spanning tree instance for each VLAN configured in the network

Rapid Spanning Tree Protocol (RSTP)

This is an evolution of STP that provides faster convergence than STP

Rapid PVST+

This is a Cisco enhancement of RSTP that uses PVST+ and provides a separate instance of 802.1w per VLAN

Multiple Spanning Tree Protocol (MSTP)

This is an IEEE standard inspired by the earlier Cisco proprietary Multiple Instance STP (MISTP) implementation

RSTP

(IEEE 802.1w) supersedes the original 802.1D

Rapid PVST+

This is the Cisco implementation of RSTP on a per-VLAN basis

- Discarding

- Learning

- Forwarding

3 RSTP port states

- Root port

- Designated port

- Backup port

- Alternate port

4 RSTP port roles

backup port

The ________ is a backup to a shared medium, such as a hub

True

(T/F) A backup port is less common because hubs are now considered legacy devices

Blocking

With a Max Age timer of 20 seconds, a switch port that has not received an expected BPDU from a neighbor switch will go into the __________.

Listening

After the blocking state, a port will move to the _________ state.

Learning

the switch port receives and processes BPDUs and prepares to participate in frame forwarding.

Forwarding

switch port is considered part of the active topology. The switch port forwards user traffic and sends and receives BPDU frames.

Disabled

does not participate in spanning tree and does not forward frames