Switches, Routers and VLANS

Question 1

what does a switch do

Answer 1

checks the destination mac address on the packet and forwards it to the port assigned that adress

Question 2

how does a switch know where a mac address is

Answer 2

checks the sender mac adress on packets send to it and assigns it to the port that it received the packet on

Question 3

What is a forwarding database

Answer 3

the table that keeps track of the mac addresses on a switch

Important to rember that a port can connect to more nodes via another switch so the table will add all address reachable to the port on the address

Question 4

what are the three basic functions of a switch

Answer 4

Learning, Forwarding and flooding

Question 5

what allows a switch to hold a packet when checking for a mac address

Answer 5

Memory buffer.

This is also used if the port is already busy sending or receiving

Question 6

Does a switch add tracing information

Answer 6

No

Question 7

What layer does a switch work at

Answer 7

2 as it is only concerned with mac addresses

Question 8

what layer are IP adresses in

Answer 8

3

Question 9

why would a switch use flooding

Answer 9

the mac address is unknown so it acts like a hub

Question 10

What is a collision domain

Answer 10

it is segment of network that on witch collisons of packets are possibe

Question 11

what is the purpose of a bridge

Answer 11

a device to connect two networks together, works simerly to a switch

Question 12

why is a bridge used today

Answer 12

connecting two different types of network

EG Cat-6 to fiber

Question 13

what is a SFP port

Answer 13

a port for high speed networks on switches normally used to connect switches together or to connect switches to servers

Question 14

what is the connection between two switches called

Answer 14

a uplink

Question 15

why are switches important to security

Answer 15

they stop packets even being checked by computers that should not see the packet

Question 16

what do switches use to find where a devices is

Answer 16

Mac Address table

Question 17

what will a switch do to a packet with a mac address ff-ff-ff-ff-ff-ff

Answer 17

Broadcast it to all ports

Question 18

What Layer is a router on

Answer 18

3 network layer as they know about IP Adresses

Question 19

what can routers do that a switch cannot

Answer 19

can facilitate between networks with different subnets

Question 20

what do switches split up

Answer 20

broadcast domains

Question 21

what works on level 3 of the osi model

Answer 21

router

Question 22

what is another name for level 3 of the osi model

Answer 22

Network layer

Question 23

What does Nat stand for

Answer 23

Network address translation

Question 24

give a breaf explanation of a vpn

Answer 24

a vpn is a secure connection between two private networks over a public network

Question 25

what is another name for a VPN

Answer 25

Tunnel

Question 26

what layer does a vlan run on

Answer 26

2

Question 27

what is it called when you vertically seperate one phisical switch

Answer 27

vlan

Question 28

Why are vlans usefull

Answer 28

cut down on traffic created by broadcast requests by only braudcasting a packet with a unknown to a small part of the network seperated by said vlan