Skip to main content

The Session Control Layer

The top Application Layer of the OSI Reference Model is responsible for making a request to access the information resource - a Computer. With the Session Control Layer,  the access to information resource is performed. 

The link of the user Computer ( featured in Application Layer) is established with a Computer ( a Computer that's part of the Session and located at the other end ) that can provide information to the user. 

The Computer that's located at the other end comes in the picture as a result of activities that are directed by the Session Control Layer.

____________________________________


Note: It must be noted that a Session underlines the existence of at least two objects. In a Session - the  objects can speak  ( transmit ) or listen ( receive ). When one speaks, the other listens and vice vice versa.

_____________________________________


In other words, with the help of the Session Control Layer, connection establishment with a Computer that stores the required information is possible. 

'Log in'/ 'log on' and 'log out'/ 'log off' are the terms that we commonly use to  listen in the world of Computers. 'Log in' activity  is related to the connection establishment with a Computer that can serve the user. 

'Log in' / 'log on' is performed to meet the user Computer requirements. The user Computer is hungry for information. The hunger is served through a Session.

So, the requirement of a controlled Session is fulfilled. The requirement is of a connection establishment. 'Log in' activity is an act that serves the requirement of connection establishment pretty well. 

 'Log out' / 'log off' is related to the release of the connection link that was established. 'Log out' is performed when the user Computer has been served the information it required. So, the requirement of a connection link is over.

When we no longer require the link that is used to connect, we can do away with the connection link. That's what is exactly done when 'log out' is performed. 

When the user Computer ( information seeking Computer) and the information resource Computer seek to part ways they can do so. Usually parting of ways is necessary when being connected with a connection link becomes useless. 

So, 'log in' marks connection establishment and 'log out' means connection release. These two are the prime activities of the Session Control Layer.



Labels:

Comments

Post a Comment

Popular posts from this blog

Local-Area Networks

Local-Area Networks ( LANs ) are restricted to a small area. Such Networks may be established within a building. Computers that are part of Local-Area Networks are Personal Computers ( PCs ) or microcomputers. These Computers are connected to each other. Simple communication lines connect these Pers Networks bring people together. When people join  hands teamwork becomes possible. The structural composition of LANs simplifies teamwork. In other words, LAN hardware supports teams having similar processing requirements. LAN Computers readily support personalization of tasks allocated to professionals.  Office staff can work together and share information. This improves the efficiency of the entire workforce. It has been noted that here all the Networked Computers are Personal Computers. They are of equal capacity. Mostly LAN users have similar tasks. If situations allow, a user is independent to access any Computer to serve his purpose. LAN users can exercise the option of secu...
Post a Comment
Read more

Computers - An Introduction

Computers are man made machines. They are made to work very fast. Working fast they can solve  big and small problems.  Modern science has given us these computers. They are very popular. Computers affect and change lives. They keep us happy.The happiness grows. Computers are quick and smart. Great problem solvers and simplifiers are our computers. They can do our work without stopping. Focus is on doing only what is needed. Not needed, not done.  Computers are  life-less servants. They cannot think or make decisions on their own. They are empowered to work. They are given each and every thing so that they carry out our orders. Orders are respected by computers. The manner in which computers work is wholly dependent on man.  The quality of service provided by computers is remarkable. They are loved by human beings. Computers are known for smart and quick service. Computers do not give wrong results. Correct answers are always given. Questions which are difficult...
Post a Comment
Read more

Euclid's Algorithm

The Greatest Common Divisor ( GCD ) of  two numbers is a number. The number ( GCD ) causes division of the two numbers. This number ( GCD ) is the greatest number that is possible. This divisor partially forms the two numbers. Adding  the divisor successively may result in formation of the two numbers. One can note that when the divisor is the greatest, the division of the dividend is the sharpest. The division operation is very effective. When the Greatest Common Divisor of two numbers is considered, we think of a number that can cause division of both the numbers. Here the two numbers are unequal. The Greatest Common Divisor causes divisions of the two numbers differently. This is clear from the two different quotient values.  The GCD value is very interesting to note. It relates very well with the two numbers. The GCD of two even numbers is also an even number. The GCD of two odd numbers is an odd number. So, we can say that GCD is an abstraction of the two numbers in ...
1 comment
Read more