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Understand the Components of a Network. Mrs. Whaley. Nodes and File Servers. Each device on a local area network, such as a computer or printer. Each node is connected to a file server High-speed computers with large hard drives that are used to store large amounts of data.

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nodes and file servers
Nodes and File Servers
  • Each device on a local area network, such as a computer or printer.
  • Each node is connected to a file server
    • High-speed computers with large hard drives that are used to store large amounts of data.
    • All nodes and file servers are connected via physical media.
why should data be centralized on a network
Why should data be centralized on a network?
  • Gives users access to most up-to-date data
  • Eliminates problem of same data being duplicated on each user’s computer
network interface card
Network Interface Card
  • Connects a computer to a network
  • Controls data between computer’s RAM and network cable.
client server networks
Client Server Networks
  • One or more file servers stores most of the shared data and run the network operating system.
  • Network operating system – manages the LAN by establishing and maintaining the connections between the nodes and the file server.
    • Common systems are Microsoft Windows NT or XP Servers and Novell Corporation’s NetWare
network topology
Network Topology
  • Physical arrangement of computers on a network.
  • 3 most common
    • Bus
    • Star
    • ring
bus topology
Bus topology
  • A single cable runs the length of the network.
  • Each node connects to one cable.
  • Inexpensive, but entire network may crash from one cable being down.
star topology
Star Topology
  • Each node connects to a hub through the file server.
  • Use more cable than a bus.
  • Single cable will not crash network.
ring topology
Ring Topology
  • Each node connects to the next in a circular arrangement.
  • A token special set of data) travels from one computer to the next around the circle.
  • If a computer needs to send or receive data, it must wait until the token gets to it.
  • Eliminates 2 computers transmitting data at the same time.
protocols
Protocols
  • Standards that describe how the different devices on a network communicate w/ each other.
  • Data must travel through channels before reaching media and vice versa.
  • Each layer performs its own function and has its own set of protocols.
lan standards
LAN STANDARDS
  • All network elements combined.
  • Ethernet – used with bus and star topologies, twisted pair or fiber optic cables and a NIC.
  • Fast Ethernet – transmits data at 100 Mbps instead of 10 Mbps
lan standards cont
LAN standards cont.
  • Token ring – 2nd most widely used network.
  • LocalTalk – Macs use this.
    • Ordinary phone cables arranged in bus topology.
      • Data transmits at only 230 KBPS.
      • Slower than Ethernet or token ring