L2 fundamental

Question 1

Vlan 1

Answer 1

Default and Trunk=Native

Question 2

Ext. Range Vlans

Answer 2

-1006-4094
-VTP Trans Mode

Question 3

802.1Q

Answer 3

-Trunking protocol
-Insert tag in frame
-dot1q

Question 4

DTP

Answer 4

Dynamic trunk protocol

Question 5

VTP

Answer 5

Vlan trunking protocol

Question 6

Encap

Answer 6

Encapsulation protocol

Question 7

STP version

Answer 7

Classic: 802.1D-ieee
Default: 802.1w- rapid-pvst+
802.1s - MSTP

Question 8

STP process

Answer 8

1. Root bridge elected
2. 1 Root port elected
3. Each link has 1 designated port elected
4. Leftover is non-designated; i.e blocking

Question 9

Root bridge

Answer 9

Lowest BID=Priority + VLANID + MAC address
All ports are designated port
Lower=Better

Question 10

STP tools

Answer 10

Port Fast:
BPDU Guard= err- disables port when an other switch/device tries to take over STP
Root Guard=no other device can come and take root bridge role
Loop Guard=stop normal convergence process

Question 11

MST

Answer 11

-Multiple Spanning Tree
-802.1s
- exact number of topologies

Question 12

Spanning-Tree mode config verify

Answer 12

MST region name
MST revision number
Instances>Vlan

Question 13

LACP

Answer 13

Link Aggregation Control Protocol
Active/Passive on both sides

Question 14

CAM

Answer 14

Content Addressable Memory

Question 15

BPDU

Answer 15

Bridge Protocol Data Unit
Contains Root ID

Question 16

Port States 801.1D

Answer 16

Find
Listen: listening for BPDUs
Learn: leaning for BPDUs
Blocking: blocks all traffic except for BPDUs which it only receives
Disable: Int shut down

Question 17

STP Timers

Answer 17

Hello: 2 seconds
Fwd Delay: How long between listening and learning state; 15 seconds*2
Max age: 20 Sec

50 seconds= failure

Question 18

Rapid PVST+

Answer 18

802.1w
Uses P+P negotiations instead of timers
All switches send BPDUs
Different port types
TCN doesn’t need root to forward
TCN receives=flush MAC table

Question 19

TCN

Answer 19

Topology change notifications

Question 20

Port States 802.1W

Answer 20

Fwd.
Learn
Discarding= Listening, Blocking and Disable. Receiving BPDU, not sending them.

Question 21

Port type Edge ports

Answer 21

Skips 30s and TCN

Question 22

Port type Network ports

Answer 22

Bridge assurance