The presentation is all about a brief discussion about LAN.

1. A Brief Discussion about Local
Area Network (LAN)

2. Networking

3. NETWORK
LAN MAN WAN

4. LAN (Local Area Network):
A LAN (local area network) is a group of computers and network devices connected
together, which spans a relatively small area. The connections must be high speed and
relatively inexpensive (e.g., token ring or Ethernet).
LANs are capable of transmitting data at very fast rates with limited distance.
MAN (Metropolitan Area Network):
A MAN (metropolitan area network) is a larger network that usually spans several buildings
in the same city or town.
MANs (Metropolitan Area Networks) connect multiple geographically nearby LANs to one
another (over an area of up to a few dozen kilometers) at high speeds.

5. WAN (Wide Area Network):
Wide Area Networks (WANs) connect networks in larger geographic areas, such as Florida,
the United States, or the world.
The technology is high speed and relatively expensive.

6. LAN

7. Wired & Wireless LAN
Wi-Fi is obviously more convenient than wired Ethernet cables. But Ethernet still
offers advantages — faster speeds, lower latency, and no wireless interference
problems.
You probably won’t be connecting an Ethernet cable to your smartphone any
time soon. But this matters when dealing with desktop PCs, laptops at desks,
game consoles, TV-streaming boxes, and other devices.

8. Why LAN
• Sharing resources (files, applications or hardware,
an Internet connection, etc.)
• Communication between people (email, live
discussions, etc.)
• Communication between processes (such as
between industrial computers)
• Guaranteeing full access to information for a
specified group of people (networked databases)
• Multiplayer video games

9. Why LAN

10. Why LAN

11. LAN Components
• Cables
• Servers
• Workstations
• Hubs/ switches
• Routers

12. Cables

13. Workstations
Workstations are called such because they typically do have a human
user which interacts with the network through them.

14. Servers
Servers are generally not used by humans directly, but rather run continuously to
provide "services" to the other computers (and their human users) on the network.
Services provided can include printing and faxing, software hosting, file storage and
sharing, messaging, data storage and retrieval, complete access control (security) for the
network's resources, and many others.

15. LAN Topologies
 Bus Topology
 Ring Topology
 Star Topology
 Tree Topology
 Hybrid Topology

16. Bus Topology
Here a set of clients are connected via a shared
communication line, called a bus

17. 1. Advantages
 Easy to implement and extend
 Well suited for temporary or small networks where speed is not a
major factor.
 Cheaper than other topologies.
 Cost effective as only a single cable is used.
2. Disadvantages
 Limited cable length and number of stations
 If there is a problem in the cable, then the whole network goes
down.
 Performance degrades as additional computers are added.
 Slower than other topologies.
Bus Topology

18. Ring Topology
Here each node connects to exactly two other nodes, forming a circular pathway
for signals. Data travels from node to node, with each node handling every packet.

19. Ring Topology
1. Advantages
 Very orderly network where every device has access to the
token and the opportunity to transmit.
 Performs better than a star topology under heavy network
load.
 Does not require network server to manage the connectivity
between the devices.
2. Disadvantages
 One malfunctioning workstation can create problem for the entire
network.
 Moves, adds and changes of devices can affect the network.
 Much slower.

20. Star Topology
A star topology consists of a central hub or switch or PC which
acts as a conduit to transmit messages.

21. Star Topology
1. Advantages
 Better performance since it avoids the use of unnecessary data
nodes or paths.
 Each node can be inherently isolated without affecting the entire
network.
 It is easy to understand, establish and navigate.
 Its central nature allows the inspection traffic through the
network.
2. Disadvantages
 The system is highly dependent on the central hub. If it fails, then
the entire system is collapsed.