1. Presented by Serge Kpan LTEC 4550.020 Network Systems Administration 1

2. Agenda What is networking? Networking devices Hub Switch Router Bridge Gateway Firewall Wireless Access Point Making all work together 2

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. 3

4. Hub A 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 4

5. Hub Diagram In 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. 5

6. Switch A device that subdivide a network into smaller segments Operates 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 device Cost: $50 and up 6

7. Switch Diagram This 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. 7

8. Router A 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 8

9. Router Diagram In this diagram the modem get the information from the internet and send it to the router who relays that to the computers. 9

10. Bridge A 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 independent Cost: $15 and Up 10

11. Bridge Diagram T his scenario is an example of network segmentation for better management and bandwidth usage. 11

12. Gateway A 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 12

13. Gateway Diagram In 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. 13

14. Firewall Firewalls 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 14

15. Firewall Diagram In this figure, we network computers, laptops and a server protected behind a firewall running on a network router.The Firewall is used to provide a first line of defense against data integrity and attacks, and we use the server provides additional data protection and stability. 15

16. Wireless AP Also 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 16

17. Wireless AP Diagram In this scenario multiple wireless devices connect to the network via the wireless access point. This connection is setup for wired and wireless network. 17

18. Putting all together! 18

19. What to retain A hub repeats signal and transmit it to all nodes in a broadcast domain A switch is an intelligent device that route frames based on the Mac address and segment networks A bridge connect dissimilar networks and is software or hardware based A router is and intelligent device that routes packets based on the IP address across networks Firewalls (or DMZ) filter traffic from and outside a network to prevent unauthorized access and required some rules and configuration. 19

20. THANK YOU FOR YOUR ATTENTION 20