chapter 2 section 2

Question 1

Designated Port?

Answer 1

the port that sends and receives traffic, to and from that segment to the Root Bridge

Question 2

alternate ports?

Answer 2

doesnt send or accept packets, unless the main root port goes down, then the STA recalculates the path and turns the alternate path on as a root port.

Question 3

Bridge Priority?

Answer 3

The bridge priority is a customizable value that can be used to influence which switch becomes the root bridge. The switch with the lowest priority, which implies the lowest BID, becomes the root bridge

A bridge priority of 0 takes precedence over all other bridge proprieties

Question 4

Extended System ID

Answer 4

VLAN information is included in the BPDU frame through the use of the extended system ID. All newer switches include the use of the extended system ID by default.

Question 5

review section 2.1.2.9 extended system ID

Answer 5

extended system id is used to allow a separate STP spanning tree protocol for each vlan, as the 1st networks did not use vlans and therefore only used one spanning tree protocol and didn’t need the extended system id.

Question 6

PVST+?

Answer 6

a Cisco enhancement of STP that provides a separate 802.1D spanning tree instance for each VLAN configured in the network. The separate instance supports PortFast, UplinkFast, BackboneFast, BPDU guard, BPDU filter, root guard, and loop guard

Question 7

(RSTP?

Answer 7

Rapid Spanning Tree Protocol (RSTP) or IEEE 802.1w - This is an evolution of STP that provides faster convergence than STP

Question 8

Rapid PVST+?

Answer 8

rapid per vlan spanning tree :This is a Cisco enhancement of RSTP that uses PVST+. Rapid PVST+ provides a separate instance of 802.1w per VLAN. The separate instance supports PortFast, BPDU guard, BPDU filter, root guard, and loop guard.

Question 9

MSTP?

Answer 9

Multiple Spanning Tree Protocol
MSTP maps multiple VLANs into the same spanning tree instance. The Cisco implementation of MSTP is MST, which provides up to 16 instances of RSTP and combines many VLANs with the same physical and logical topology into a common RSTP instance. Each instance supports PortFast, BPDU guard, BPDU filter, root guard, and loop guard.

Question 10

MST ?

Answer 10

multiple spanning tree:
The Cisco implementation of MSTP, which provides up to 16 instances of RSTP (802.1w) and combines many VLANs with the same physical and logical topology into a common RSTP instance. Each instance supports PortFast, BPDU guard, BPDU filter, root guard, and loop guard. The CPU and memory requirements of this version are less than those of Rapid PVST+ but more than those of RSTP

Question 11

PVST?

Answer 11

per vlan spanning tree (cisco proprietary)

Question 12

port state blocking does what?

Answer 12

The port is an alternate port and does not participate in frame forwarding. The port receives BPDU frames to determine the location and root ID of the root bridge switch and which port roles each switch port should assume in the final active STP topology.

Question 13

port state disabled does what?

Answer 13

port is shutdown and does not work

Question 14

port state forwarding does what?

Answer 14

The port is considered part of the active topology. It forwards data frames and sends and receives BPDU frames

Question 15

port state listening does what?

Answer 15

Listens for the path to the root. STP has determined that the port can participate in frame forwarding according to the BPDU frames that the switch has received. The switch port receives BPDU frames, transmits its own BPDU frames, and informs adjacent switches that the switch port is preparing to participate in the active topology.