network topologies network devices. topology the physical topology of a network refers to the...
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NETWORK TOPOLOGIES
NETWORK DEVICES
TOPOLOGY
The physical topology of a network refers to the configuration of cables, computers, and other peripherals.
Main Types of Physical
Topologies:
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A linear bus topology consists of a main run of cable with a terminator at each end.
ADVANTAGES: Easy to connect a computer. Requires less cable length.
DISADVANTAGES: Network shuts down if there is a break in the main
cable. Terminators are required at ends. Difficult to identify the problem.
LINEAR BUS
STAR TOPOLOGY A star topology is designed with each node connected directly to a central network hub.
ADVANTAGES: Easy to install. No disruptions to the network when connecting or
removing devices. Easy to detect faults.
DISADVANTAGES: Requires more cable length. If the hub fails, nodes attached are disabled. More expensive.
TREE OR EXPANDED STAR
A tree topology combines characteristics of linear bus and star topologies.
ADVANTAGES: Point-to-point wiring for individual segments. Supported by several hardware and software venders.
DISADVANTAGES: Length of each segment is limited by the type of cabling used.
RING TOPOLOGY
In ring network, each node is connected to two adjacent nodes in the form a closed ring or loop.
ADVANTAGES: Nodes can be easily added or removed. Less expensive.
DISADVANTAGES: Difficult to install and maintain. If a node fails, it affects the entire network.
MESH TOPOLOGY
A mesh topology combines characteristics of bus, ring and star topologies.
ADVANTAGES: Point-to-point wiring for individual segments. Supported by several hardware and software venders.
DISADVANTAGES: If the backbone line breaks. the entire segment goes down.
HYBRID TOPOLOGY
It is the combination of more
than one topology.
Money Length of cable needed Future growth Cable type
CONSIDERATIONS WHEN CHOOSING A TOPOLOGY
NETWORK DEVICES HUB:
A connection point for devices in a network. Hubs are commonly used to connect
segments of a LAN. SWITCH:
A network switch or switching hub is a computer networking device that connects network segments.
WIRELESS ACCESS POINT: (WAP) is a device that allows wireless devices to
connect to a wired network using Wi-Fi, bluetooth or related standards.
NETWORK DEVICES NETWORK REPEATER:
It retimes and regenerates the signals to proper amplitudes and sends them to the other segments.
GATEWAY: It can translate information between different
network data formats or network architectures.
NETWORK ROUTER: It is used to route data packets between two networks.
NETWORK DEVICES BRIDGE:
A bridge reads the outermost section of data on the data packet, to tell where the message is going.
It reduces the traffic on other network segments.