NETWORKING COMPONENTSBy Jessica Tolson

LTEC 4550

Firewall

Firewalls are used to protect from malicious

inbound network traffic as well as

protect the company inside by not allowing

certain outbound traffic.

Built in software allows you to create

access lists as controlling

mechanisms.

Placed in front of your router, it serves as a

protection point between you and the

rest of the world.Example

Cisco ASA 5505

Newegg.com $335.69

ExampleCheckpoint 620

Newegg.com $376.83

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

OSI and the Firewall

Router

• Joins multiple networks together.

• Sends information packets

• Determines the best route to send packets

Internet Gateway

Router

Routers are placed by the gateway.

ExampleCisco Small Business RouterNewegg.com $157.99

ExampleUbiquiti Network RouterBphotovideo.com $309.95

OSI and the Router

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

Gateway

• Stopping point for data between networks.

• Translator between two systems

• Routes internal traffic between LANs

• Can be built in with routers, switches and firewalls

Place between the network router and

the switch

Gateway

SwitchRouter

ExampleDialogic DMG1008DNIW

Digital GatewayTruedataonline.com

$1909

ExampleDell SonicWALL SRA

4600Walmart.com $1750

OSI and the Gateway

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

GatewayGateway

Switch

• Uses MAC addresses in data packets to transport data

• Supports 10/100/1000 Ethernet

• Capable of inspecting data

Switch

Bridge

Gateway A switch situates between the gateway and internal LAN - Sometimes a bridge and sometimes workstations, servers or other network devices.

ExampleCisco SG300-10

Newegg.com $169

ExampleCisco WS-C3560G-

48TS-SAdvanteco.com $2395

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

OSI and the Switch

Bridge

• Software or hardware that connects two or more networks

• Two different networks that need to exchange information

The bridge receives connection from the switch. Different LANs on either side can use the bridge to talk to one another.

ExampleTRENDnet TPA-311Newegg.com $36.99

ExampleTRENDnet Tew-640mbCompSource.com $60.17

OSI and the Bridge

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

Hub

• Connects multiple network devices together

• Shared link• Uses broadcast

method• Collisions

The hub receives network connection from the switch port. The hub can then share out the one link with different network devices.

ExampleNetgear GS108-400NAS

Newegg.com $39.99

ExampleNetgear 8 Port

10/100Newegg.com $27.62

OSI and the Hub

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

Wireless AP

• Provide wireless access

• Connected to a network device that provides internet access

• Portable

Wireless AP

Switch

Free to Roam, Free to work, Free to Play

ExampleLinksys WAP300N

Newegg.com $77.15

ExampleASUS EA-N66

Walmart.com $89.24

OSI and the Wireless Access Point

Application

Presentation

Session

Transport

Network

Data Link

Physical

7

6

5

4

3

2

1

Internet

Router

Switch

Bridge

Firewall Gateway

Hub on LAN B

Wireless APLAN A

LAN B

LAN C

REFERENCES• https://

www.paloaltonetworks.com/resources/learning-center/what-is-a-firewall.html

• http://www.linktionary.com/g/gateway.html

• http://searchnetworking.techtarget.com/definition/router

• http://compnetworking.about.com/od/hardwarenetworkgear/g/bldef_switch.htm

• http://windows.microsoft.com/en-us/windows-vista/what-is-a-network-bridge

• http://www.computerhope.com/jargon/h/hub.htm

• http://windows.microsoft.com/en-us/windows/hubs-switches-routers-access-points-differ#1TC=windows-7