1

NETWORKING COMPONENTS

Presented by Serge KpanLTEC 4550.020

Network Systems Administration

2

AgendaWhat is networking?Networking devicesHubSwitchRouterBridgeGatewayFirewallWireless Access PointMaking all work together

3

What is Networking?Most people use the internet nowadays but did

you ask yourself what make it work?In the computers world, networking is the

connection of two or more computing devices together to share data and information. Most networks are built on hardware and software platform.

4

HubA hub (also known as repeater) is device that has

more than one output port. Contains multiple of data ports where network

nodes are connected. Operates at the physical layer of the OSI. Repeat s signal from a node and broadcast it to

all other connected nodes. Cost: ranges from $15 and up

5

Hub DiagramIn this scenario we have a server that is connected to 3 computers via a hub or a switch. When we sent information (a data packet, or packet) from the server to computer #1, through the hub, all three computers (1,2 and 3) will receive the information.

6

SwitchA device that subdivide a network into

smaller segmentsOperates at the Data link layer of the OSI

model.Has multiport and can make better decisions

using MAC address and better use of bandwidth

Smart deviceCost: $50 and up

7

Switch DiagramThis scenario shows a home network diagram using a broadband modem (either ADSL or Cable) such as Netopia modem for DSL, and a LAN Switch with a couple of computers.

8

RouterA multiport connectivity device that direct data

between nodes on different networks.Can integrate LANs and WANs running at

different speeds and protocols. Operates at the Network Layer (Layer 3) of the

OSI Model. For enterprise and home use Cost: $15 and up

9

Router DiagramIn this diagram the modem get the information from the internet and send it to the router who relays that to the computers.

10

BridgeA device that connect to network segments by

analyzing incoming traffic frames and making decision about where to direct them base on their MAC addresses

Operates at the Data Link layer (Layer 2) of the OSI Model

A bridge is protocol independentCost: $15 and Up

11

Bridge DiagramThis scenario is an example of network segmentation for better management and bandwidth usage.

12

GatewayA combination of networking hardware and

software that connect two different kind of networks.

Can reside on servers, microcomputers, routers, or mainframes.

Can redirect LAN traffic when no match found for the IP address on the routing table.

Operate at multilayer of the OSI model but usually at layer 3

Cost: $15 and up

13

Gateway DiagramIn this scenario the machine IP number is the default gateway to get to the rest of the network or the Internet. It shows the connection of two different kinds of networks, example a home network and the Internet.

14

FirewallFirewalls are dedicated security device that stop

unauthorized access from and to a network from (hackers, viruses, etc) by blocking the data according to the rules up in its configuration.

Operate at Multiple layers of the OSI Model usually the first three layers

Cost: from $15 and up

15

Firewall DiagramIn this figure, we network computers , laptops and

a serverprotected behind a firewall running on a network

router .TheFirewall is used to provide a first line of defense

against dataintegrity and attacks, and we use the server

providesadditional data protection and stability.

16

Wireless APAlso known as WAP (Wireless Access Point) is a

device that give the ability to wireless devices to connect to a wired network through, Wi-Fi, Bluetooth, Infrared (IR) or other related standards.

Operates at both physical and Data Link of the OSI Model.

Cost: $29.99 and up

17

Wireless AP DiagramIn this scenario multiple wireless devices connect to the network via the wireless access point. This connection is setup for wired and wireless network.

18

Putting all together!

19

What to retainA hub repeats signal and transmit it to all nodes in a

broadcast domainA switch is an intelligent device that route frames

based on the Mac address and segment networksA bridge connect dissimilar networks and is software

or hardware basedA router is and intelligent device that routes packets

based on the IP address across networksFirewalls (or DMZ) filter traffic from and outside a

network to prevent unauthorized access and required some rules and configuration.

 

20

THANK YOU FOR YOUR ATTENTION

Any

Question?