Introduction to computer networks.
What is a computer network?
It is a Connection between two or more computers through a cable or some type of wireless connection. It enables users to share information and devices between computers and other users within the network. On the network, you can share information and devices installed on other computers.
Components of a computer network.
There are many components that make up a computer network. Decades of technological advances power our networks today. Here are some of those components.
Network Cables
coaxial
Coaxial cable is a cable that consists of an outer plastic sheath, a copper screen, an inner dielectric insulator, and a copper core.
Fiber Optic
Fiber Optic cables are cables that transmit light versus an electrical signal. They are made up of a cable jacket, strengthening fibers, a buffer, a cladding and a glass core. Fiber Optic cables, since light is used instead of an electrical signal, are not susceptible to Electromagnetic Interference or Radio Frequency Interference (also known as EMI and RFI respectively.)
Serial
Twisted Pair
Unshielded Twisted Pair (UTP)
Unshielded Twisted Pair cable is one of the most commonly used cable types in todays networks. Each pair is twisted together and then twisted in an unshielded cable.
Shielded Twisted Pair (STP)
Shielded Twisted Pair is not as common as Unshielded Twisted Pair, but it is still used in some instances. STP is made just like a UTP cable, with the exception that a copper shield and copper ground are also run through the cable to help reduce the effects of EMI/RFI on data transmission.
Straight Through
Cross-Over
Rollover
Network Interface Controller (NIC) Card
Typically when you think of a NIC Card, you should think of an NIC embedded onto the motherboard of your computer or an expansion card that is installed into an ISA,PCI, or PCI-Express slot inside your computer.
Repeater
One of the limitations of computer networking is found in the transmission medium. Certain cables are only capable of transmitting a certain distance before a concept called Attenuation comes into play. If the distances of a cable run exceed the physical limitations of the medium, a repeater may be placed before the limitation distance to recondition and repeat the signal so that it may run the rest of the length of the cable.
Hubs
Hubs are very basic devices that are made up of many NIC ports. They take the electrical signals that a computer transmits into them and repeats them out every port on the device except for the one the signals arrived in. Since hubs offer no services other than repeating signals to multiple ports, they are often called multiport repeaters.
Bridges
Switches
Routers
Firewalls
What is a computer network?
It is a Connection between two or more computers through a cable or some type of wireless connection. It enables users to share information and devices between computers and other users within the network. On the network, you can share information and devices installed on other computers.
Components of a computer network.
There are many components that make up a computer network. Decades of technological advances power our networks today. Here are some of those components.
Network Cables
coaxial
Coaxial cable is a cable that consists of an outer plastic sheath, a copper screen, an inner dielectric insulator, and a copper core.
Fiber Optic
Fiber Optic cables are cables that transmit light versus an electrical signal. They are made up of a cable jacket, strengthening fibers, a buffer, a cladding and a glass core. Fiber Optic cables, since light is used instead of an electrical signal, are not susceptible to Electromagnetic Interference or Radio Frequency Interference (also known as EMI and RFI respectively.)
Serial
Twisted Pair
Unshielded Twisted Pair (UTP)
Unshielded Twisted Pair cable is one of the most commonly used cable types in todays networks. Each pair is twisted together and then twisted in an unshielded cable.
Shielded Twisted Pair (STP)
Shielded Twisted Pair is not as common as Unshielded Twisted Pair, but it is still used in some instances. STP is made just like a UTP cable, with the exception that a copper shield and copper ground are also run through the cable to help reduce the effects of EMI/RFI on data transmission.
Straight Through
Cross-Over
Rollover
Network Interface Controller (NIC) Card
Typically when you think of a NIC Card, you should think of an NIC embedded onto the motherboard of your computer or an expansion card that is installed into an ISA,PCI, or PCI-Express slot inside your computer.
Repeater
One of the limitations of computer networking is found in the transmission medium. Certain cables are only capable of transmitting a certain distance before a concept called Attenuation comes into play. If the distances of a cable run exceed the physical limitations of the medium, a repeater may be placed before the limitation distance to recondition and repeat the signal so that it may run the rest of the length of the cable.
Hubs
Hubs are very basic devices that are made up of many NIC ports. They take the electrical signals that a computer transmits into them and repeats them out every port on the device except for the one the signals arrived in. Since hubs offer no services other than repeating signals to multiple ports, they are often called multiport repeaters.
Bridges
Switches
Routers
Firewalls
.
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