peer to peer and client server model

peer to peer and client server model

• 1.
  PEER TO PEER(P2P) • Concept was popularized by file sharing systems such as the music-sharing application Napster • P2P network is created when two or more PCs are connected and share resources without going through a separate server. • A couple of computers connected via a Universal Serial Bus to transfer files • Peers are both suppliers and consumers of resources • Access rights are governed by setting sharing permissions on individual machines. • New peers can join the group while old peers leave at any time • --> BitTorrent system, Skype. • More vulnerable • Routing attack, Denial of service
• 2.
  UNSTRUCTTURED PEER TOPEER
• 3.
  STRUCTURED PEER TOPEER
• 4.
  ADVANTAGES • Use lessexpensive hardware • Easy to administer • User has full accessibility • Ideal for small business and home users • No NOS required • Easy setup and low costsecure DISADVANTAGES • Not very secure • No central point for storage • Additional load on computer because of resource sharing • Hard to maintain version control • May have duplication of resources • Difficult to uphold security policy
• 5.
  CLIENT SERVER MODEL •Request service, called clients and provide service are called sever • Server is often designed to be a centralized system that serves many clients. • Clients and servers communicate over a computer network on separate hardware • Clients and servers exchange messages in a request response messaging pattern • To prevent abuse and maximize uptime, the server's software limits how a client can use the server's resources. • A denial of service attack exploits a server's obligation to process requests by bombarding it with requests incessantly
• 7.
  ADVANTAGES • Centralized security •Faster accesss • Single password DISADVANTAGES • Central point of failure • Administrator required • Server software required • Can cause network congestion