NETWORK DEVICE
To set a network of computers, different network devices are used. The network devices are required for the smooth functioning of networks. Some network devices are listed below.
1. Network Interface Card
2. Transmission Media
3. Hub
4. Switch
5. Modem
6. Connector
1. Network Interface Card (NIC)
A Network Interface Card is a networking device which is a circuit board or network adapter that physically connects a computer with a network cable. Network Interface Card is needed to be physically plugged in the one of the expansion slots of a motherboard. The NIC contains connection ports for either coaxial or twisted pair cables or both. Each NIC attached with a computer is assigned a unique identification numbers called node address. A node address of a NIC helps you to identify a computer on the network.
2. Transmission Media (Communication Channel)
Transmission media is types of networking device. The communication channel provides the physical path through which data and information flow on a network. The transmission media may be Bounded media and Unbounded media.
The bounded media are connected cables. The cable used in LAN, may be Twisted-pair cable (Unshielded Twisted pair and Shield Twisted pair), Co-axial cable, and Fiber optic cable.
Unbounded transmission media are used for wireless communications. The unbounded transmission media may be Radio Wave, Microwave, Infrared, Laser, Bluetooth and Satellite.
3. Hub
A Hub is a computer networking device that joins multiple computers or other network devices together to form a segment of computer network. A Hub looks like a small rectangular box which has a series of connecting ports. Each port accepts one end of network cable running from a computer. When a Hub receives a packet (chunk) of data at one of its ports from a PC on the network, it simply transmits (repeats) the packet to all computers on the network including the one that originally sent the packet through its ports. So, a Hub is also referred as a multi-port repeater. A Hub is suitable only for the small network where the network has less than 30 users.
4. Switch
A Switch is a computer networking device that connects computers other network devices or LAN segments. A Switch appears nearly identical to network hub. A switch is capable of inspecting data packets as they are received and can determine source and destination device of that packets. Switch transmits the packets to the right computer through the port only. As the network switch transmits the electric signals only to the concerned computer on the network, it reduces the amount of unnecessary network traffic and offers generally better performance than a hub.
5. Modem
A Modem (Modulator Demodulator) is a networking device that enables a computer to transmit data, information and files through a telephone line. Simply you can say a Modem is such a networking device that connects computers on the network through telephone lines. A computer generates only digital signals and these signals can’t be transmitted through the telephone line. A telephone line can pass only analog signals. So, a modem of sender computer converts digital signals into analog signals and transmits to a receiver computer where the modem of the receive computer converts the analog signals back to digitals signals.
6. Connectors
A Connector is a device that is used to join cables or to join a cable to a network device/computer. There are verities of connectors. According to the cable and a network device we need to use a correct connector. Each kind of cable uses different connectors. BNC (Bayonet Naur Connector), T-Connector, Terminator and RJ-45 connector are commonly used in networking.
To set a network of computers, different network devices are used. The network devices are required for the smooth functioning of networks. Some network devices are listed below.
1. Network Interface Card
2. Transmission Media
3. Hub
4. Switch
5. Modem
6. Connector
1. Network Interface Card (NIC)
A Network Interface Card is a networking device which is a circuit board or network adapter that physically connects a computer with a network cable. Network Interface Card is needed to be physically plugged in the one of the expansion slots of a motherboard. The NIC contains connection ports for either coaxial or twisted pair cables or both. Each NIC attached with a computer is assigned a unique identification numbers called node address. A node address of a NIC helps you to identify a computer on the network.
2. Transmission Media (Communication Channel)
Transmission media is types of networking device. The communication channel provides the physical path through which data and information flow on a network. The transmission media may be Bounded media and Unbounded media.
The bounded media are connected cables. The cable used in LAN, may be Twisted-pair cable (Unshielded Twisted pair and Shield Twisted pair), Co-axial cable, and Fiber optic cable.
Unbounded transmission media are used for wireless communications. The unbounded transmission media may be Radio Wave, Microwave, Infrared, Laser, Bluetooth and Satellite.
3. Hub
A Hub is a computer networking device that joins multiple computers or other network devices together to form a segment of computer network. A Hub looks like a small rectangular box which has a series of connecting ports. Each port accepts one end of network cable running from a computer. When a Hub receives a packet (chunk) of data at one of its ports from a PC on the network, it simply transmits (repeats) the packet to all computers on the network including the one that originally sent the packet through its ports. So, a Hub is also referred as a multi-port repeater. A Hub is suitable only for the small network where the network has less than 30 users.
4. Switch
A Switch is a computer networking device that connects computers other network devices or LAN segments. A Switch appears nearly identical to network hub. A switch is capable of inspecting data packets as they are received and can determine source and destination device of that packets. Switch transmits the packets to the right computer through the port only. As the network switch transmits the electric signals only to the concerned computer on the network, it reduces the amount of unnecessary network traffic and offers generally better performance than a hub.
5. Modem
A Modem (Modulator Demodulator) is a networking device that enables a computer to transmit data, information and files through a telephone line. Simply you can say a Modem is such a networking device that connects computers on the network through telephone lines. A computer generates only digital signals and these signals can’t be transmitted through the telephone line. A telephone line can pass only analog signals. So, a modem of sender computer converts digital signals into analog signals and transmits to a receiver computer where the modem of the receive computer converts the analog signals back to digitals signals.
6. Connectors
A Connector is a device that is used to join cables or to join a cable to a network device/computer. There are verities of connectors. According to the cable and a network device we need to use a correct connector. Each kind of cable uses different connectors. BNC (Bayonet Naur Connector), T-Connector, Terminator and RJ-45 connector are commonly used in networking.
2 comments:
Well explained.... Thanks.
IT Consulting Los Angeles
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