Download PPT of Network Topology

Created by- AMRITANSHU KUMAR
Network Topology
• Network Topology refers to layout of a network and
how different nodes in a network are connected to
each other and how they communicate.
• Topologies are either physical (the physical layout of
devices on a network) or logical (the way that the
signals act on the network media, or the way that the
data passes through the network from one device to
the next).
Types of Network Topology
• There are five types of Network Topology
1. Mesh Topology
2. Star Topology
3. Bus Topology
4. Ring Topology
5. Tree Topology
1. Mesh Topology
• In a mesh network, devices are connected with
many redundant interconnections between network
nodes. In a true mesh topology every node has a
connection to every other node in the network.
• There are two types of mesh topologies:I. Full mesh topology
II. Partial mesh topology
2. Star Topology
• In a star network devices are connected to a central
computer, called a hub. Nodes communicate across the
network by passing data through the hub.
Main Advantage: In a star network, one malfunctioning
node doesn't affect the rest of the network.
Main Disadvantage: If the central computer fails, the entire
network becomes unusable.
3. Bus Topology
• In networking a bus is the central cable -- the main wire -- that
connects all devices on a local-area network (LAN). It is also called
the backbone. This is often used to describe the main network
connections composing the Internet. Bus networks are relatively
inexpensive and easy to install for small networks. Ethernet systems
use a bus topology.
Main Advantage: It's easy to connect a computer or device and
typically it requires less cable than a star topology.
Main Disadvantage: The entire network shuts down if there is a
break in the main wire and it can be difficult to identify the problem if
the network shuts down.
4. Ring Topology
• A local-area network (LAN) whose topology is a ring. That is,
all of the nodes are connected in a closed loop. Messages
travel around the ring, with each node reading those
messages addressed to it.
Main Advantage: One main advantage to a ring network is
that it can span larger distances than other types of
networks, such as bus networks, because each node
regenerates messages as they pass through it.
5. Tree Topology
• This is a "hybrid" topology that combines characteristics
of linear bus and star topologies. In a tree network, groups of starconfigured networks are connected to a linear bus backbone cable.
Main Advantage: A Tree topology is a good choice for large computer
networks as the tree topology "divides" the whole network into parts
that are more easily manageable.
Main Disadvantage: The entire network depends on a central hub
and a failure of the central hub can cripple the whole network.
Multiplexer networks
• A Multiplexer is a device that allows one of several
analog or digital input signals which are to be selected and
transmits the input that is selected into a single
medium. Multiplexer is also known as Data Selector. A multiplexer
of 2n inputs has n select lines that will be used to select input line
to send to the output. Multiplexer is abbreviated as Mux. MUX
sends digital or analog signals at higher speed on a single line in
one shared device. It recovers the separate signals at the receiving
end. The Multiplexer boosts or amplifies the information that later
transferred over network within a particular bandwidth and time.
Demultiplexer
• The process of getting information from one input and transmitting
the same over one of many outputs is called demultiplexing. A
demultiplexer is a combinational logic circuit that receives the
information on a single input and transmits the same information
over one of 2n possible output lines.
• The bit combinations of the select lines control the selection of
specific output line to be connected to the input at given instant. The
below figure illustrates the basic idea of demultiplexer , in which the
switching of the input to any one of the four outputs is possible at a
given instant.
Thank you…
Click here
YouTube , Twitter , My Website , Facebook .