Dc lec- (network models)
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The document discusses the roles of computers in a network as peers, clients, or servers. It also describes different network models including peer-to-peer networks (workgroups), server-based networks (domains), and hybrid networks. Peer-to-peer networks have no central server and every computer is a peer. Server-based networks divide tasks between servers that provide services and clients that request them. Hybrid networks contain elements of both peer-to-peer and server-based networks.
Dc lec- (network models)
- 2. reCAp Of LeCTUre 5 • Protocols • Elementsof Protocols • Standards • De-Jure • De-Facto • Standard organizations • Internet Standards
- 3. OvervIew Of LeCTUre 6 • Rolesof Computer in Network • Peer • Client • Server • Network Models • Peer to Peer (Workgroup) • Server Based (Domain Environment)
- 4. rOLe Of COMpUTers IN NeTwOrk • There are three roles of computer in a Local AreaNetwork • Clients • Peers • Servers.
- 5. rOLe Of COMpUTers IN NeTwOrk (CONT.) • Clients • A computer is called a “client” in a LAN if it contains following characteristics: • It usesthenetwork resources/services. • It must have a client operating system installed on it, e.g. Win98/NT/2000Professional/XP/Vista. • It alwaysrequest server for any service.
- 6. rOLe Of COMpUTers IN NeTwOrk (CONT.) • Peers • A computer is called a “peer” in a LAN if it contains following characteristics: • It providesand usesnetwork resources. • It must have a peer operating system installed on it, e.g. Win98/NT/2000Professional/XP/Vista.
- 7. Role of ComputeRs in netwoRk (Cont.) • Servers • A computer is called a “server” in a LAN if it contains following characteristics: • It providesthenetwork resources/services. • It must have server operating system installed on it, e.g. Win NT 4 Server/2000 server/2003 Server/2008 server. • It acceptstherequestsof clients.
- 9. netwoRk moDels • Threemain typesof Network Models 1.Peer to Peer Network 2.Server-Based Network 3.Hybrid Network
- 10. peeR to peeR netwoRk (woRkgRoup) • No server No client • Every computer isaPeer • Peer is the computer, which both uses and provides network resources. • No central login process • littlesecurity control • Uses • Sharing disk spaceand resourcessuch asprinter and faxes. • Operating SystemsUsed • Win 98/2000 Professional/XP/Vista
- 11. peeR to peeR netwoRk (Cont.) • WORKGROUP • Workgroup is a group name given to a set of computers that are logically and physically connected together within apeer-to-peer network to shareresources. • Recommended number of computersis10.
- 12. peeR to peeR netwoRk (Cont.) • ADVANTAGES: • No extra investment in server hardware and software is required. • Easy setup. • No network administrator isrequired. • Ability of usersto control resourcessharing. • No relianceon other computer for their operation. • Lower cost for small network.
- 13. Peer to Peer Network (CoNt.) • DISADVANTAGES: • Additional load on computersbecauseof resourcessharing. • Inability of peers to handle as many networks connection as server. • Lack of central organization, which makedatahard to find. • Weak security. • Lack of central management, which makes large peer network hard to work with. • Extracost on training theusersin order to manageresources.
- 14. Server-BaSed Network • Defined by the presence of servers on a network that provide security and administration of thenetwork. • Server-Based or Client-Server networks divide processing tasksbetween clientsand servers. • Clients request services such as file storage and printing, and serversdeliver them. • Server computers typically are most powerful than client computer. • Minimum limit of clients and servers is 1 and maximum limit dependson different factors. • Thisnetwork ismanaged with respect to domain.
- 15. Server-BaSed Network (CoNt.) • DOMAIN • group name given to aset of computersthat arelogically and physically connected together within aserver-based network. • Domain security and logon permissions are controlled by special serverscalled domain controllers. • There isone master domain controller in each domain, called Primary Domain Controller (PDC), which may be assisted by secondary domain controllers, called Backup Domain Controllers(BDC).
- 16. Server-BaSed Network (CoNt.) • ADVANTAGES: • Strong central security. • Central file storage, which allows all users to work from the sameset of dataand provideseasy backup of critical data. • Ability to shareexpensiveequipment, such aslaser printers. • Freeing of users from the tasks of managing the sharing the resources. • Easy manageability of alargenumber of users. • Central organization, which keeps data from getting lost among computers.
- 17. Server-BaSed Network (CoNt.) • DISADVANTAGES: • Expensivededicated hardwarefor servers. • Expensive network operating system software and client licenses. • A dedicatenetwork administrator (usually required).
- 18. HyBrid Network • Containsall threetypesof computersoperating on • Servers • Clients • Peers. • It generally hasactivedomainsand workgroups. • This means that while most shared resources are located on servers, network users still have access to any resources being shared by peersin workgroup. • It also means network users do not have to log on to the domain controller to accessworkgroupsresourcesbeing shared by peers.
- 19. Hybrid Network (CoNt.) • ADVANTAGES • Hybrid networks provide the advantages of server-based network and many of the advantages of peer-to-peer network.
- 20. Hybrid Network (CoNt.) • DISADVANTAGES • Hybrid computing shares the disadvantages of server- based networking.
- 21. Summary • Rolesof Computer in Network • Peer • Client • Server • Network Models • Peer to Peer (Workgroup) • Server Based (Domain Environment)