VLANs and Trunking - CompTIA Network+ N10-009 - 2.2

Question 1

What is VLAN trunking and why is it used in network design?

Answer 1

VLAN trunking is a method used to carry traffic for multiple VLANs across a single network link between two switches or devices.

Question 2

What is a trunk port?

Answer 2

Switch port that carries traffic for multiple VLANs over a single physical link.

Question 3

How does VLAN tagging work in a trunk port?

Answer 3

a VLAN Tag (12 bits long) is added to each ethernet frame, telling the switch which vlan it belongs to.

Question 4

What is a LAN

Answer 4

A group of devices in the same broadcast domain

Question 5

what is 802.1q

Answer 5

The main trunking protocol

Question 6

How many vlans in total can traverse the trunk connection

Answer 6

total of 4095 (not counting reserved.)

Question 7

ISL

Answer 7

Interswitch Link. Before truck.

Question 8

what is default vlan

Answer 8

vlan assigned to an interface by default. commonly vlan 1

Question 9

Native VLAN

Answer 9

handles untagged traffic on a trunk port

Question 10

What is Native VLAN used for

Answer 10

Supports devices that doesn’t have VLAN tagging capabilities. (make sure Native VLAN matches on both devices.)

Question 11

How does a layer 2 switch make their forwarding decisions?

Answer 11

based on mac address of an ethernet frame

Question 12

How does a layer 3 switch make forwarding decisions?

Answer 12

Looks at destination IP address and makes a routing decision on where the traffic should go

Question 13

How does layer 3 switch work

Answer 13

by combining switch functionality at layer 2 and router functionality at layer 3 and put both in same unit.

Question 14

Does layer 3 switch change the switching process?

Answer 14

No. not changing the way a switch or router operates. Switch and router functionally are still operating at their sperate layers. But when combined on switch the administrative process is easier.

Question 15

SVI

Answer 15

Switch virtual interfaces. Layer 3 switch needs ports to be turned on for the routing process to work.

Question 16

Downside of layer 3 switch

Answer 16

Layer three switch is less capable then a Stand alone switch can switch better stand alone router can router better.

Question 17

Port can have two different vlan?

Answer 17

yes

Question 18

how does vlan tech work for Voice and data

Answer 18

Switch that sees your connecting both a phone and a computer at the same time.
Data passes as untagged access VLAN
Voice is tagged with 802.1q header
Now both can work on a single cable.