Class 8 Computer Science Presentation.pptx

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1. NETWORK DEVICES Some of the devices that are required to connect computers or peripherals in a network are : Modem RJ-45 , Ethernet , Hub , Switch , Repair , Bridge , Router and Gateway .

2. MODEM Modem is derived from the term modulator-demodulator . It converts digital signals from the computer to analog from that can be transmitted over telephone wires and vice versa . A modem is a device connecting your home to your internet service provider (ISP) through a physical connection. 

3. RJ-45 The RJ-45 [ Registered Jack-45 ] connector is commonly used for computer network cables . RJ45 connectors are twisted-pair connectors with eight positions and eight contacts (8P8C).  RJ45 connectors can be wired using two different schemes, T-568 A or B. 

4. ETHERNET NETWORK INTERFACE CARD Ethernet is a networking technology. It is used in LAN and MAN networks . Ethernet cards are the essential parts of a network . They are used to connect a computer to another computer or to a server by using a cable . The computers on Ethernet are equipped with a special card called Ethernet card .

5. ETHERNET An Ethernet card is sometimes known as Network Interface Card [ NIC ] . It is used to transmit data from the network to your computer by using a network cable . The cable connection on the Ethernet card is called RJ-45 connection .

6. HUB A hub is the most basic networking device that connects multiple computers or other networking devices together . It is a single point of connection for all devices . It is available with 8 , 12 or 24 ports . It connects segments of a LAN . The NIC tranfers data from a computer to a hub , which then tranfers it to other connected computers .

7. SWITCH A switch in a network tranfers data to a specific computer .

8. REPEATER A repeater is a device that regenerates the incoming signal . Then it places the same on the communication channel again . It is used to increase the length of the network .  Since it amplifies the signal, it requires a source of electric power.

9. BRIDGE A bridge is a device that is used to link two same networks . It reduces the amount of traffic on LAN [ Local Area Network ] as it does not send all the data packs . It can be programmed to reject packets from particular networks .

10. ROUTER A router is used to forward (route) data packets to other networks when the destination address is outside its network .This process is known as routing . It supports different WAN technologies . The most common example is a home router that is used to share broadband Internet connection .

11. GATEWAY A gateway is used to connect two networks of different types . It acts as an entrance to another network . It can translate information into a format that is understood by the computer . It can be implemented as software or as hardware or as a combination of both .

12. TECH FACT Data packets consist of data , which travel across a network. A packet is also referred to as a datagram , segment , block , cell or frame , depending on the protocol . A protocol is  a set of rules that govern how data is transmitted and received in a computer network . TCP = Transmission Control Protocol HTTP = HyperText Transfer Protocol

13. TECH FACT FTP = File Transfer Protocol SMTP = Simple Mail Transfer Protocol

14. QUESTION TIME 1. Some of the devices that are required to connect computers . [ ANY 4] 2. Modem is derived from the term ______________ . 3. Ethernet is a __________ technology. 4. A _____ is the most basic networking device that connects multiple computers or other networking devices together . 5. A _________ is a device that is used to link two same networks .

15. ANSWERS 1. Modem RJ-45 , Ethernet , Hub , Switch , Repair , Bridge , Router and Gateway . [ANY 4 ] 2. Modem is derived from the term modulator-demodulator . 3. Ethernet is a networking technology. 4. A hub is the most basic networking device that connects multiple computers or other networking devices together . 5. A bridge is a device that is used to link two same networks .

16. THANK YOU