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# Network topology

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BY Nasar OM

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### Network topology

1. 1. NETWORK TOPOLOGIES By: NASAR .OM
2. 2. NETWORK TOPOLOGY Network topology is the arrangement of the various elements (links, nodes, etc.) of a computer network. Essentially, it is the topological structure of a network and may be depicted physically or logically.
3. 3. BUS TOPOLOGY -This network widely used in 1980 -Commonly referred to as a linear bus -it use one cable -All the nodes and devises are connected to that cable -No main computer
4. 4. Advantages  easy to establish connection  It is best suited for small network  Easy to connect a computer or devices  Requires less cable  Cheaper other topology
5. 5. Disadvantages  Not suitable in large network  Limited number of devices can be added  Difficult to identify problems  If network cable break, the entire net work will be down
6. 6.  Star topology  Most common topology  nodes are individually connected to a central connection point  Multiple computer are connected to a host computer  The hub manage and control all function  It centrally controlled  Communicate only via the host computer
7. 7. Advantages  Easy to add devices  One cable failure not effect to others  Centralized management  Easy to find problems
8. 8. Disadvantages  Require more cable than bus topology  Failure of central hub can effect all network  Costly(installation)
9. 9. Ring topology  Devices are connected in a continuous loop  No host computer  Data flow in a circular fashion  No centralized control  each node connects to exactly two other nodes  Data travels from node to node
10. 10. Advantages  Greater speed  Less cable  Easy to find fault  Central service not require
11. 11.  Disadvantages  More cable than bus  Break in the ring will dispute the entire network  It not common as bus  Moving, adding and changing the devices can affect the network  Only one machine can transmit on the network at a time
12. 12. Tree topology  combines characteristics of linear bus and star topologies  It arranged as a tree  It consists of groups of star-configured workstations connected to a linear bus backbone cable
13. 13.  Advantages  Easy to expansion of network  Error detection and correction is easy.  If one segment is damaged, other segments are not affected.  we divide the whole network into segments (star networks),  which can be easily managed and maintained.
14. 14.  Disadvantages  Difficult to configure  More cable require  Scalability of the network depends on the type of cable used.  A lot of maintenance is needed  backbone failure effect to entire network
15. 15.  Mesh topology  Each computer connected to every other computers by a separate cable  Implementing mesh topology is expensive  Fully connected wired networks have the advantages of security and reliability  each component is connected to every other component
16. 16.  Advantages  Provide redundant paths between devices  It eliminate traffic problems  Easy expansion  One computer fails , entire network still operate  All side communication
17. 17.  Disadvantages  Expensive  More cable require  Difficult to manage  Problem identification difficult
18. 18.  Hybrid topology  uses two or more other network topologies, including bus , mesh , ring , star, and tree topology.
19. 19.  REMINDER questions………..  1) Physical or logical arrangement of network is a) Topology b) Routing c) Networking d) None of the mentioned Ans : Topology 2) In this topology there is a central controller or hub a) Star b) Mesh c) Ring d) Bus Ans :star
20. 20. 3) Data communication system spanning states, countries, or the whole world is a) LAN b) WAN c) MAN d) None of the mentioned Ans : WAN 4) Expand WAN a) World area network b) Wide area network c) Web area network d) None of the mentioned Ans : wide area network
21. 21. 5) Multipoint topology is a)Bus. b)Star. c)Mesh. d)Ring. Ans : bus 6) Combination of two or more topologies are called a)Star. b)Bus. c)Ring. d)Hybrid. Answer :hybrid
22. 22. 7) The computer network is A) Network computer with cable B) Network computer without cable C) Both of the above D) None of the above Ans : C) Both of the above 8) The transfer mode of a network that involves setting up a dedicated end to end connection is called ......... A) Circuit switching B) Message switching C) Telegraph switching D) Packet switching Ans A
23. 23. 9) If ........................ is used in computer networks, the sending PC first establishes a link with the receiving link. A) Packet switching B) Message switching C) Telegraph switching D) Circuit switching ANS : D 10 ) In ...................., messages are broken up into packets, each of which includes a header with source, destination and intermediate node address information. A) Packet switching B) Message switching C) Telegraph switching D) Circuit switching ANS :A
24. 24. 11) Telephone network of bi-directional real time transfer between computer is the application of .............. network. A) Circuit switching B) Message switching C) Telegraph switching D) Packet switching ANS : A
25. 25. FOR YOUR COOPERATION