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Network Topologies

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Network Topologies Point-to-Point Topology Point-to-point (PTP) topology connects two nodes directly together. The following examples are pure point to point links ... – PowerPoint PPT presentation

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Title: Network Topologies


1
Network Topologies
2
Point-to-Point Topology
  • Point-to-point (PTP) topology connects two nodes
    directly together. The following examples are
    pure point to point links
  • Two computers communicating via modems.
  • A mainframe terminal communicating with a front
    end processor.
  • A workstation communicating along a parallel
    cable to a printer.

3
Star Topology
  • The star topology is a popular method of
    connecting the cabling in a computer network. In
    a star, each device connects to a central point
    via a point-to-point link. Depending on the
    locical architecture used, several names are used
    for the central point includeing the following
  • Hub
  • Multipoint Repeater
  • Concentrator
  • Multi-Access Unit (MAU)

4
Ring Topology
  • The Ring Topology is a physical, closed loop
    consisting of point-to-point links. In the
    diagram you can see how each node on the ring
    acts as a repeater. It receives a transmission
    from the previous node and amplifies it before
    passing it on.

5
Bus Topology
  • In a Bus topology, all devices attach to the same
    transmission medium. The medium has a physical
    beginning and end.All buses are implemented using
    electrical cable, usually coax, and the ends of
    the cable must be terminated with a terminating
    resistor that matches the impedance of the cable.
    The terminating resistor prevents data
    reflections from coming across as data
    corruption. The bus is considered a multipoint
    system because all devices tap into the same
    backbone cable.

6
Hybrid Topology
  • The Hybrid topology scheme combines multiple
    topologies into one large topology. The hybrid
    network is common in large wide area networks.
    Because each topology has its own strengths and
    weaknesses, several different types can be
    combined for maximum effectiveness.

7
Coaxial Cable
8
UTP Cable
9
Ethernet
  • An older, common wiring system for Ethernet
    (10Base2) and (10Base5) uses coaxial cable in a
    linear bus topology. In the most common type of
    Ethernet, each node connects to the coax through
    a T-connector (BNC) that taps into the signals on
    the coaxial cable. The nodes both transmit and
    receive through the same connector. Therefore,
    10Base2 Ethernet is a logical as well as physical
    bus.

10
Token Ring
  • The adjacent figure shows the path that a
    transmission follows through the network.
    Starting at the hub, the signal travels through a
    pair of wires to the receive circuits on the
    nodes network interface. The receive circuit
    passes the signal to the transmit circuit, which
    repeats the signal on a separate pair of wires
    and sends the signal back to the hub.

11
ARCnet
  • ARCnet is wired in a star using coaxial cable.
    The diagram adjacent shows an extremely simple
    ARCnet using a single passive hub.
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