What is the Network Topologies? Type of Topologies?

Ring topology
Ring topology

What is the Network Topologies? Type of Topologies?

• LANs and WANs – Geographical coverage
• LANs
– A single geographical location, such as office bui
lding,
school, etc
– Typically High speed and cheaper.
• WANs
– Spans more than one geographical location often
connecting separated LANs
– Slower
– Costly hardware, routers, dedicated leased lines and
complicated implementation procedures
Types of  Topologies?
i) LAN Topologies
ii) Bus Topology
iii) Ring Topology

iv) Star Topology

 

i) LAN Topologies

  • There are different types of network topologies that are used in a network. The network topologies in the structure or the layout of the different devices and computers connected to the network.
  • The topologies commonly used in LAN are—Bus topology, Star topology, and Ring topology.

 

Bus Topology

  • The data signal is available to all computers connected to the bus .
  • The data signal carries the address of the destination computer.
  • Each computer on the network checks the destination address as the data signal travels through the bus.
  • The computer whose address matches makes a copy of the signal and converts it into data
  • The data signal on the bus does not get destroyed and still transmits along the bus, and is finally absorbed by the terminator attached to the end of the network.
  • It is good for connecting 15–20 computers.
  • A single coaxial cable is generally used in bus topology, to which the computers or devices are connected.
  • Ethernet is a commonly used protocol in networks connected by bus topology.
Bus topology
Bus topology

 Ring Topology

  • All devices in the network are connected in the form of a ring.
  • Each device has a receiver and transmitter to receive the data signals and to send them to the next computer, respectively.
  • Ring network does not have terminated ends, thus data signals travel in a circle.
  • Ring topology (Figure 9.23) uses token passing method to provide access to the devices in the network.
  • The computers or devices are connected to the ring using twisted pair cables, coaxial cables or optic fibers.
  • The protocols used to implement ring topology are Token Ring and Fiber Distributed Data Interface (FDDI).
Ring topology
Ring toRing topologypology

Star Topology

  • All devices are connected through a central link forming a star-like structure.
  • The central link is a hub or switch. The computers are connected to the hub or switch using twisted pair cables, coaxial cables or optic fibers.
  • Star topology (Figure 9.24) is the most popular topology to connect computer and devices in network.
  • The data signal is transmitted from the source computer to the destination computer via the hub or switch.
  • The common protocols used in star topology are Ethernet, Token Ring, and LocalTalk.
  • In addition to the bus, ring, and star topologies, there are complex topologies like the tree
  • topology, and the mesh topology used for networking in LAN. Table 9.1 lists the advantages and disadvantages of the different LAN network topologies.

 

Ring topology
Ring topology

 

 

Advantages and disadvantages of network topologies:

 

Advantages and disadvantages of network topologies
Advantages and disadvantages of network topologies

 

Advantages and disadvantages of network topologies, Advantages , and disadvantages of network topologies, What is the Network Topologies? Type of Topologies?, What is the Network Topologies?, Type of Topologies?, LAN Topologies, Bus Topology, Ring Topology, Star Topology

 

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