basic concepts of computer created by :- king parmeshwar pawar
TRANSCRIPT
Basic Concepts Basic Concepts of of
Computer Networks Computer Networks and and
Communications Communications Network TopologyNetwork Topology
Presented by-Presented by-
Pawar ParmeshwarPawar Parmeshwar
EE (3EE (3rdrd Semester Semester))
Presentation Contents
Definition of Computer Definition of Computer NetworksNetworks
Different Network MethodsDifferent Network Methods LANLAN
Network TopologiesNetwork Topologies Summary Summary
Definition: Computer networking is the
engineering discipline concerned with the communication between computer systems or devices.
A computer network is any set of computers or devices connected to each other with the ability to exchange data.
Computer Networks
Different Network Methods are:
Local area network (LAN), Metropolitan area network (MAN) Wide area network (WAN) Wireless LANs and WANs
Different Network Methods
Local Area Network(LAN),
which is usually a small network constrained to a small geographic area. An example of a LAN would be a computer network within a building.
Local Area Network (LAN)
DEFINITION
What is a Topology ?
The physical topology of a network refers to the configuration of cables, computers and other peripherals.
TYPES OF NETWORK TOPOLOGY
Three commonly used network topologies are:-
Bus Topology
Ring Topology
Star Topology
BUS TOPOLOGY
All computers and devices connected to central cable or bus.
Consists of a main run of cable with a terminator at each end.
Popular on LANs because they are inexpensive and easy to install.
RING TOPOLOGY
Cable forms closed ring or loop, with all computers and devices arranged along ring.
Data travels from device to device around entire ring, in one direction.
Primarily is used for LANs, but also is used in WANs.
STAR TOPOLOGY
All devices connect to acentral device, calledhub.
All data transferredfrom one computer toanother passes through hub.
In the mesh topology each computer are connected with each other by separate cable. Create point to point connection to every device on network. If one cable fail data always has alternative path to get to its destination.
On a large scale, you can connect multiple LANs using mesh topology with leased line.
This type topology generally use in military area.
MESH TOPOLOGY
DIFFERENTIATION BETWEEN THE THREE TYPES OF NETWORK TOPOLOGY
WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF THE THREE
OF NETWORK TOPOLOGY?
SUMMARY
BUS TOPOLOGY
DEFINITION
•All computers and devices
connected to central cable
DEFINITION
•All computers and devices
connected to central cable
ADVANTAGE
•Easy to connect a computer or
peripheral to a linear bus.
ADVANTAGE
•Easy to connect a computer or
peripheral to a linear bus.
•Requires less cable length than
a star topology.
•Requires less cable length than
a star topology.
DISADVANTAGE
•Entire network shuts down if
there is a break in the main cable.
DISADVANTAGE
•Entire network shuts down if
there is a break in the main cable.
•Terminators are required at both
ends of the backbone cable.
•Terminators are required at both
ends of the backbone cable.
•Difficult to identify the problem
if the entire network shuts down.
•Difficult to identify the problem
if the entire network shuts down.
SUMMARY
RING TOPOLOGY
DEFINITION
•Cable forms closed ring or loop, with all
computers and devices arranged
along ring.
DEFINITION
•Cable forms closed ring or loop, with all
computers and devices arranged
along ring.
ADVANTAGE
•Data is quickly transferred without a
‘bottle neck’.
ADVANTAGE
•Data is quickly transferred without a
‘bottle neck’.
•The transmission of data is relatively
simple as packets travel in one direction
only.
•The transmission of data is relatively
simple as packets travel in one direction
only.
DISADVANTAGE
•Data packets must pass through every computer between the sender and recipient therefore, this
makes it slower.
DISADVANTAGE
•Data packets must pass through every computer between the sender and recipient therefore, this
makes it slower.
•If any of the nodes fail then the ring is broken
and data cannot be transmitted successfully.
•If any of the nodes fail then the ring is broken
and data cannot be transmitted successfully.
•It is difficult to troubleshoot
the ring.
•It is difficult to troubleshoot
the ring.
SUMMARY
DEFINITION
•All devices connect to a
central device, called hub.
DEFINITION
•All devices connect to a
central device, called hub.
ADVANTAGE
•Easy to install and wire.
ADVANTAGE
•Easy to install and wire.
•Security can be implemented
in the hub/switch.
•Security can be implemented
in the hub/switch.
DISADVANTAGE•Requires more cable
length than a linear topology.
DISADVANTAGE•Requires more cable
length than a linear topology.
If the hub or concentrator fails,
nodes attached are disabled.
If the hub or concentrator fails,
nodes attached are disabled.
More expensive than linear bus topologies because of the cost of
the concentrators.
More expensive than linear bus topologies because of the cost of
the concentrators.
STAR TOPOLOGY
•Easy to detect faults and to
remove parts
•Easy to detect faults and to
remove parts
1.Provide redundant path between device.
SUMMARY
DEFINITION
•In the mesh topology each computer are
connected with each other by
separate cable..
DEFINITION
•In the mesh topology each computer are
connected with each other by
separate cable..
ADVANTAGE
•1.Provide redundant path between device..
ADVANTAGE
•1.Provide redundant path between device..
The network can be expanded without disruption to current user..
The network can be expanded without disruption to current user..
DISADVANTAGERequire more cable then other topology .
DISADVANTAGERequire more cable then other topology .
Complicated implementations.
Complicated implementations.
MESH TOPOLOGY