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Transcript of Networking
Networking; A Crash Course What Is A Computer Network? A Network Is A Series Of Independent Computers connected to each other by a shared network medium. A Computer Network Is A Series Of two or more Connected Computers When There Is A Network Of Computers, users can share documents and use each other's peripherals, such as printers, USB drives and projectors Types Of Computer Networks LAN: Local Area Network. LAN’s Are usually confined to a single Geographic area suck as an office or school.
WAN: Wide Area Network. WAN’s are networks that can be used anywhere via dial-up phone connection or satelite links. It vastly cuts the expense of sending lots of information long distances.
Internet. The Internet Is A global network that allows file sharing, remote login and the world wide web. Intranet. A private, employee only “internet-like” browser based network.
VPN: Virtual Private Network. A VPN allows the client to “tunnel”, a secure way to transfer files to a remote acsess server in the workplace network.
Client-Server Model contains a central “server” which stores all of the network’s data. Peer-Peer Model has no dedicated “server”, all PC’s are equal and there is no “administrator” which controls the network.
Main Categories of Networks OSI Model: Open System Interconnection
This Is A Guideline To Sending And Receiving Information Packets.
This Has 7 Layers: Application, Presentation, Session, Transport, Network, Data Link and Physical
Main Categories of Networks Network Architecture
Ethernet. Most Popular LAN medium in use today. Balances Speed, Cost, and Ease Of Instillation.
Fast Ethernet. Used In Networks Demanding Higher MBPS (Megabits per second) rates. Raises the standard 10 Mbps to 100 Mbps without many changes to the existing Cable Structure.
Token Ring. All data is transmitted along a one-way ring in small packages called “Tokens”. When the token reaches the intended receiver, it marks it as read, so the sender knows the message was obtained.
FDDI: Fiber-Distributed Data Interface. Standard For Data transmission on fiber-optic lines in LAN’s up to 200km in distance.
Network Cables Coaxial Cables. Twin conductors. Solid wire core, braided metal sheathing, and a plastic outside.
UTP: Unshielded Twisted Pair. Four pairs Of twisted wires. Twisting prevents interference between wires.
STP: Shielded Twisted Pair. Same As UTP, except it has a thin metal sheathing which prevents interference Fiber Optic. Translucent Fibers inside a protective coat
Network Topologies Network topologies are geometric arrangements of nodes and cable links in a LAN
Bus: In A bus network, every client connects to one single cable, the literal backbone of the network. this is usually used in offices or computer labs.
Ring: In a ring network, the computers are in a closed loop, packages flow in one direction, and each client acts as a repeater, copying the signal and sending it to the next one.
Star: In a star network, each client has it's own dedicated set of cables running from it to the server, essentialy the "Hub" Bus
Ring Star Network Hardware Network Interface Card: Are used to connect a PC to a network. The NIC provides a connection between the network cable and the computer's internal bus
Hubs / Repeaters: Are used to connect any two network media types.
Switches: Can link four, six, ten or more networks together, and have two basic architectures: cut-through and store-and-forward
Bridge: Connects two different Network media types like ethernet and FDDI
Router: Filters out network traffic by specific protocol rather than by packet address
Wireless Router: A wireless version of the Router NIC HUB Switch Router Wireless Router This Has Been A Cisco Systems production made by Alex Vos