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2. www.themegallery.com The network interface card  NIC or Network Adapter

3.  This device provides the physical, electrical, and electronic connections to the network media  NIC connects to the computer through expansion slots or built in to the motherboard of the computer  Features  Data transmission network  Sends data to another computer in the form of bits 0 and 1.  Control data flow between computer and cable systems  Equipment is operating at the physical layer

4. HUB

5. Features  Any transmission received on one port will be rebroadcast to all the other ports in the hub.  Equipment is operating at the physical layer

6. Switch

7.  Connects multiple segments of a network together.  Rebroadcasts anything it receives on one port to all the others.  The benefit of a switch over a hub is that the switch increases performance because it doesn’t suffer from the wasted bandwidth of the extra transmissions.

8. Bridge

9.  Network device that connects two similar network segments together.  The primary function of a bridge is to keep traffic separated on both sides of the bridge.

10. Router

11. Example for VPN  Virtual: Information within a private network is transported over a public network.  Private: The traffic is encrypted to keep the data confidential.

12. Features  A network device that connects multiple, often dissimilar, network segments into an internetwork.  Can make intelligent decisions about how best to get network data to its destination  All routers can:  Connect dissimilar networks  Interpret Layer 3 addressing and other information  Determine the best path for data to follow  Reroute traffic

13. Gateways

14.  Gateway allow connection types protocols together  For example:  Network of you use protocol IP Network and other network use a protocol IPX, Novell, DECnet, SNA... or any protocol that you will Gateway convert from this type protocol to them “talk” together.

15. MODEMS  MODEM – MOdulation-DEModulation

16. MODEMS  A modem is a device that changes digital data into an analog form for transmission over an analog medium and then back to digital again at the receiving end.

17. CSU/DSUs

19.  The Channel Service Unit/Data Service Unit (CSU/DSU) is a common device found in equipment rooms when the network is connected via a T-series data connection

20. Summary LAYERDEVICES Application, Presentation, SessionNo TransportNo NetworkRouter Data linkBridges, Intelligent hubs Physical NIC, Repeater, Concentrator, Hub, connector, MODEM

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