Download TOPOLOGIES in COMPUTER NETWORKING

TOPOLOGIES
in
COMPUTER NETWORKING
Refers to the physical layout of
the network devices and cabling
and how all the components
communicate with each other.
FOUR BASIC TYPES OF
NETWORK TOPOLOGIES
Mesh
Bus
Ring
Star
MESH TOPOLOGY
Also called a point-to-point topology
Each device is connected directly to all
other devices on the network.
Network of 4—each computer would
need 3 connections and cables;
Network of 30 computers, each would
need 29 connections and cables.
MESH
MESH
ADVANTAGES
Provides fault tolerance

The ability to overcome a
failure.
Fault tolerance allows
the network to continue
functioning in the event
of a cable failure.
Used in WANs to ensure
that all sites continue to
transmit in the event of
a cable failure.
DISADVANTAGES
Rarely used in LANs.
High expense to equip
each computer with an
individual connection.
Large amount of cable
required for all other
computers on the
network.
Design a Mesh Topology
BUS TOPOLOGY
Multipoint topology
Sharing
Each computer has just one connection
attached to a single cable that is shared
by all other devices on the network.
Single starting and ending point.
At each end of the cable is a device
known as a terminator.
BUS TOPOLOGY
PACKET
Terminator
An electrical signal that
flows along the cable.
BUS TOPOLOGY
ADVANTAGES
It is simple and reliable.
It requires a small
amount of cable.
Adding more devices to
the network is easy to
do.
DISADVANTAGES
Troubleshooting problems
is difficult to do.
It becomes slower as more
devices are added to the
network.
A cable problem can shut
down the entire network.
Design a Bus Topology
RING TOPOLOGY
Opposite of a bus, a bus has two end
points.
A ring is a circle with no ends.
All devices on the network are
connected to the ring.
Packets travel in a loop in one direction.
RING TOPOLOGY
RING TOPOLOGY
ADVANTAGES
It is easy to manage.
It is good for networks
with many devices.
Cable problems are
easy to locate.
DISADVANTAGES
It can require more cable
and special equipment.
It is not as widely used as a
bus topology.
One malfunctioning
computer can shut down the
entire network.
Design a Ring Topology
STAR TOPOLOGY
All devices are connected to a central
device.
The central device is known as a hub.
A multipoint star topology resembles a
star when viewed from above.
STAR TOPOLOGY
controller
scanner
STAR TOPOLOGY
ADVANTAGES
It is the easiest
topology to manage and
troubleshoot.
Adding additional
devices is easy to do.
One malfunctioning
computer or cable
doesn’t stop the entire
network.
DISADVANTAGES
If the hub fails, the
entire network
stops.
It requires more
cable.
Cable installation
can be more
difficult.
Design a Star Topology
DESIGN CONSIDERATIONS
How many devices will be attached to the
network?
What is the maximum distance between the
devices?
What is the predicted growth for the
network?
What degree of fault tolerance is necessary?
How much money can be spent?
What other networks will be connected to it?