Networks, Network hardware Types of network Presentation By Singh _Bedi

1. Types of networks
Network Topology
Network hardware

2. Types of Networks Topology

3. •How many types of
network topology ?
•A) 1 B) 2 C) 3
D) 4

4. Lets read more about :-
• NETWORK HARDWARE
• NETWORK TOPOLOGY
• TYPES OF NETWORKS

5. Network Hardware

6. Network Hardware
• Additional Network Hardware Devices
– Network Interface Cards (NICs)
• Puts the data into packets and transmits packet onto the network.
• May be wired or wireless.
– Gateway
• Connects networks with different protocols like TCP/IP network and IPX/SPX
networks.
• Routers and Gateways often refer to the same device.
– Proxy server
• Isolates internal network computers from the internet.
• The user first access the proxy server and the proxy server accesses the internet
and retrieves the requested web page or document. The user then gets a copy of
that page from the proxy server.

7. Types of network topology
• Star topology
• Ring topology
• Bus topology

9. Star topology
• Star networks are one of the most common computer
network topologies. In its simplest form, a star network
consists of one central switch, hub or computer, which act
as a conduit to transmit messages. This consists of a central
node, to which all other nodes are connected; this central
node provides a common connection point for all nodes
through a hub.

10. Advantages And
Disadvantages
of star topology
• Better performance: star topology prevents the passing of
data packets through an excessive number of nodes. At most,
3 devices and 2 links are involved in any communication
between any two devices. Although this topology places a
huge overhead on the central hub, with adequate capacity,
the hub very high utilization by one device without affecting
others.
• Failure of the central hub renders the network inoperable
• There is central server dependency.
• Expensive to purchase.
• Requires a large amount of cable to be connected.

12. RING TOPOLOGY
• A ring network is a network topology in which
each node connects to exactly two other
nodes, forming a single continuous pathway
for signals through each node - a ring. Data
travel from node to node, with each node
along the way handling every packet.

13. Advantages And
Disadvantages
of ring topology
 Very orderly network where every device has access to the token and the
opportunity to transmit
 Performs better than a bus topology under heavy network load
 Does not require a central node to manage the connectivity between the
computers
 Communication delay is directly proportional to number of nodes in the
network
 Bandwidth is shared on all links between devices
 More difficult to configure than a Star: node adjunction = Ring shutdown
and reconfiguration

15. BUS TOPOLOGY
• The bus is the data link in a bus network. The
bus can only transmit data in one direction,
and if any network segment is severed, all
network transmission ceases.

16. Advantages And
Disadvantages
of bus topology
• Easy to connect a computer or peripheral to a linear bus
• Requires less cable length than a star topology
• It works well for small networks.
• Entire network shuts down if there is a break in the main cable
• Terminators are required at both ends of the backbone cable
• Difficult to identify the problem if the entire network shuts down
• Not meant to be used as a stand-alone solution in a large building
• It is slow when more devices are added into the network.

17. • Computer network A collection of computing
devices that are connected in various ways in
order to communicate and share resources
• Computer networks have opened up an entire
frontier in the world of computing called the
client/server model