Network ---- topology

               

                                      NETWORK TOPOLOGY

1. Bus Topology

2. Ring Topology

3. Star Topology

BUS TOPOLOGY 

Single cable connects all network nodes without intervening connectivity devices

Devices share responsibility for getting data from one point to another

Terminators stop signals after reaching end of wire

Prevent signal bounce

Inexpensive, not very scalable

Difficult to troubleshoot, not fault-tolerant

ADVANTAGE OF BUS TOPOLOGY

• Works well for small networks
• Relatively inexpensive to implement
• Easy to add to it

DISADVANTAGE OF BUS TOPOLOGY

• Management costs can be high
• Potential for congestion with network traffic

RING TOPOLOGY

Ring topology

One method for passing data on ring networks is token passing

ADVANTAGE OF RING TOPOLOGY

• Easier to manage; easier to locate a defective node or cable problem
• Well-suited for transmitting signals over long distances on a LAN
• Handles high-volume network traffic
• Enables reliable communication

DISADVANTAGE OF RING TOPOLOGY

• Expensive
• Requires more cable and network equipment at the start
• Fewer options for expansion to high-speed communication

STAR TOPOLOGY

Any single cable connects only two devices

Cabling problems affect two nodes at most

Requires more cabling than ring or bus networks

More fault-tolerant

Easily moved, isolated, or interconnected with other networks

Scalable

Supports max of 1024 addressable nodes on logical network

ADVANTAGE OF STAR TOPOLOGY

• Good option for modern networks
• Low start up costs
• Easy to manage
• Offers opportunities for expansion
• Most popular topology in use; wide variety of equipment available

DISADVANTAGE OF STAR TOPOLOGY

• Hub is a single point of failure
• Requires more cable than the bus

DISTRIBUTED BACKBONE

COLLAPSED BACKBONE

PARALLEL BACKBONE

LOGICAL TOPOLOGY

• Logical topology: how data is transmitted between nodes
• May not match physical topology
• Bus logical topology: signals travel from one network device to all other devices on network
• Required by bus, star, star-wired physical topologies
• Ring logical topology: signals follow circular path between sender and receiver
• Required by ring, star-wired ring topologies