STP

Question 1

Bridge ID (BID)

Answer 1

Combination of a 4-bit bridge priority and a 12-bit system id extension

Question 2

Root bridge

Answer 2

Bridge that is the base (root) of the STP tree

Question 3

Port cost

Answer 3

STP port cost based on configured speed

Question 4

Bridge priority

Answer 4

default = 32768

Question 5

Default port costs

Answer 5

10mbps = 100
100mbps = 19
1gbps = 4
10gbps = 2

Question 6

view spanning tree info for a vlan

Answer 6

show spanning-tree vlan

show spanning-tree root

Question 7

original spanning tree specification (PVST+)

Answer 7

802.1D

Question 8

The spanning-tree algorithm

Answer 8

1. elect root bridge
2. elect root port for each non-root device
3. elect a DP for each segment
4. ports transition to forwarding to blocking/discarding

Question 9

Portfast

Answer 9

Allows an access port to immediately transition to forwarding

Question 10

BPDU Guard

Answer 10

Disable a port if a BPDU is received

Question 11

802.1w valid switch states

Answer 11

learning

discarding