Fundamental model that helps to know the key problems for the designers of distributed system

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• Prajakta Pandit   -Posted on 19 Oct 15
  
  OSI Model :
  
  - OSI (Open Systems Interconnect) reference model consists of seven layers : physical, data-link, network, transport,session, presentation and application.
  
  - OSI model layers usually do not concerned exactly to the protocol stack running on an actual system.
  
  - It is easy to add multiple-network models.
  
  - It encrypts the data for security purpose.
  
  - The protocols are hidden in the OSI model so they can easily replaced by new protocols when the technology changes.
  
  TCP/IP Model :
  
  - TCP gives guarantee that a packet will reach on the destination without any duplication and the order of data will be same.
  
  - TCP is a reliable protocol.
  
  - TCP is a connection oriented protocol, it means that connection must be open between two ends before sending data.
  
  - It has a scalable, client-server architecture.
  
  - It enables the internetworking between the organizations.
  
  Hybrid Model :
  
  - Hybrid models are most frequently used for backup purposes because they relieve enterprises of the need to use a secondary data centre.
  
  - Hybrid networks are the networks that are based on both peer-to-peer and client-server relationship.
  
  - Hybrid networks still provide all the centralized services of servers, but they also allow users to share and manage their own resources within the workgroup.
  
  - Hybrid networks incorporate the best features of workgroups in peer-to-peer networks with performance, security and reliability of server-based networks.
  
  

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