1. Networking Components Presented by Jaisson Mailloux LTEC 4550 Network Systems Administration

2. Agenda O Why is networking important? O Networking components O Hub O Switch O Router O Bridge O Gateway O Firewall O Wireless AP O Bringing it all together!

3. Why is networking important? Just about everyone communicates through some sort of Social Networking site, but have you thought about how it works? Networking allows the devices to communicate with each other.

4. Hub OSI Layer: 1 Cost: Low cost, ranges from $15 and up, normally depends on the amount of ports the hub has A hub (or repeater) sends data it receives to all other devices on the same network.

5. Hub Diagram In this scenario, I want to play a game of Age of Empires. Client 1 starts a game and sends the information to all the other computers on my network.

6. Switch OSI Layer: Multiple layers, depends on the switch, normally 2 Cost: still relatively low cost, ranges from $15 and up, normally depends on the, speed and managemtn software that’s included. A device that relays traffic based on MAC address. It also has software that allows you to build routing tables for more efficient traffic flow. Netgear Networking Switch GS116NA 16-port 10 100 1000 Mbps Gigabit Switch ROHS

7. Switch Diagram In this scenario, Client 1 wants to access data on SVR- FILE-02. There are many routes to this server. The switches learn the MAC address of these servers and route the information accordingly. Additionally we can add a route using route add if the resources were on a different network.

8. Router OSI Layer: Multiple layers, depends on the router, normally 3 Cost: still relatively low cost, ranges from $15 and up, normally depends on the, speed, software that’s included and what management capabilities it provides. A device that relays traffic based on IP address. It also has software that allows you to build routing tables for more efficient traffic flow. Some even provide a firewall. D-Link Ethernet Broadband Router EBR-2310 - router - desktop

9. Router Diagram In this scenario, client 1 needs to access a file on SVR-FILE-02. The routers builds route tables and are able to send the request from network 192.168.1.X to 192.168.3.X

10. Bridge OSI Layer: Multiple layers, depends on the router, normally 2 Cost: still relatively low cost, ranges from $15 and up, normally depends on the, speed, software that’s included, A device that repeats the traffic. Similar to a hub EXCEPT that it learns the location of the device, its MAC address and stores it for future use. NETGEAR Powerline AV Ethernet kit XAVB101 - bridge - desktop

11. Bridge Diagram In this scenario, client 1 needs to access a file on SVR-FILE-01. The bridge learns the MAC address of SVR-FILE-01 and adds it to its MAC address table. Any information sent to the bridge is then repeated to the device.

12. Gateway OSI Layer: Multiple layers, depends on the router, normally 3 Cost: still relatively low cost, ranges from $15 and up, normally depends on the, speed, software that’s included, A device that sends traffic to another network when the IP address does not match any routes in the routing table. 2 Wire wired and wireless cable modem

13. Gateway Diagram In this scenario we want to connect to a social networking site. We log on to Facebook.com from our laptop. Since the servers hosting the Facebook content is not on our network, the request is sent to the gateway. The gateway in turn forwards the request on until we reach the authoritative source for the content.

14. Firewall OSI Layer: Multiple layers, normally first 3 layers Cost: still relatively low cost, ranges from $15 and up, normally depends on the, speed, and software that’s included. This can be software or hardware based. Typically a firewall has rules to allow or permit traffic.

15. Firewall Diagram In this scenario we want the ability to get to the internet but we want to make sure we keep the bad guys out! By placing a firewall between our home resources and the network, we can block unwanted traffic.

16. Wireless AP Juniper Networks Wireless LAN Access Point WLA522 - wireless access point A wireless access point allows wireless devices the ability to communicate to wired devices. Cost: Usually $50.00 and up

17. Wireless AP Diagram In this scenario we have multiple wireless devices. We can use a wireless access point to manage the wireless and wired connections. If we were trying to get to the internet from the laptop it would connect to the wireless AP and then the firewall.

18. Bringing it all together! This is a real world scenario. 1.The switch is a type of hub and connects the wired devices together. 2.The wireless AP acts as a bridge as well as connecting the wireless to the wired devices. 3.Finally, the firewall is the gateway and router.