Wednesday, 2 December 2015

Network Architecture / The OSI Model - Study Materials for IBPS IT Officers Exam

A lot of candidates have been preparing for the IBPS IT officer and the exam. Network architecture and date security is a very important aspect of IT officer study and here we are covering some very useful concepts related to Data security and networking. There are many questions asked in IBPS IT officer’s examination related to Network architecture and candidates should learn these concepts to score good marks. These concepts are however basic and there is a lot which remains. Questions which are asked are basic in nature so candidates should not worry about this. If they understand these concepts, they will surely get those marks what they expect in the IT officer examination. Network Architecture study material pdf  for IBPS IT officer. Network architecture means what the network is like? Means the arrangement of nodes (computers) in an environment where each computer needs to communicate with each other. We can arrange these nodes in several ways which is based on the resource availability and requirement of user. These arrangements of nodes are called network architecture.

Network architecture can be of 2 types which are:

  1. Client server architecture and
  2. Peer to Peer network model
1. Client server architecture:
It as an arrangement of nodes where one node act as client( which sends the request for any resource) and other acts as a server ( to process that request and send the result back to the client). There is no intermediate layer in this architect, it is called simple client server model.

2 tier Client server Model
In this 2 layer client server architecture, there is another layer called the data server layer where the logic exists how you can access the result from the server computer. It is caller 2 layer client server model.

3 tier client server model
In this layer, there are 2 intermediate layers like presentation layer and application layer. What we mean that Presentation logic here is different from the application logic. These are contained in two different layer which are attached to the client and sever model.

Multi tier architecture:
In the multi tier architecture, there are more number of logic/ layers in the intermediate levels and the request which the client makes, goes through these layers until it is finally processed by the server.

Peer to peer model:
It is very similar to the client server model and there is one difference however. All the systems are divided into computational nodes and all of them have equivalent processing ability and capability to solve a problem.

Read Data Communication Study material For IT officer Exam

OSI Network Model:
There are 7 network layers in OSI ( Open system interconnection) model where each layers provides a different logic and send the processed date to the next layer till the information reaches the client/ server.

These layers from bottom to top are:

  1. Physical layer

  2. Data link layer

  3. Network layer

  4. Transport layer

  5. Session layer

  6. Presentation layer

  7. Application layer.

Software Development Life-cycle models

The first layer is Physical layer and date transfers from this layer to the upper layer which is application layer.
Logic is generally not asked in the examination. Candidates can learn theses layers and there sequence and that is enough for IBPS It officer examination.

OSI Model Complete Material For IT officer Exam


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