Basic network concepts and the OSI model in simple terms

 

                                    

In this chapter of the journey to learn computer networking technology we explain the OSI model in simple terms, and expand on the different layers of the OSI model.

The OSI model defines the basic building blocks of computer networking, and is an essential part of a complete understanding of modern TCI/IP networks.
An understanding of the concepts of the OSI model is absolutely necessary for someone learning the role of the Network Administrator or the System Administrator.
If are looking for something less technical that focuses more on using a computer network, rather than understand the core concepts of how it works, please visit our companion website

At Smart Technology   we discuss managing technology from the perspective of a business owner or department manager.  Check out the section on Managing Technology and specifically the article on The System Administrator and the Power User 


The role of the Network Administrator or the System Administrator
On a small to mid size network there may be little, if any, distinction between a Systems Administrator and a Network Administrator, and the tasks may all be the responsibility of a single post. As the size of the network grows, the distinction between the areas will become more well defined.

In larger organizations the administrator level technology personnel typically are not the first line of support that works with end users, but rather only work on break and fix issues that could not be resolved at the lower levels.

Network administrators are responsible for making sure computer hardware and the network infrastructure itself is maintained properly. The term network monitoring describes the use of a system that constantly monitors a computer network for slow or failing components and that notifies the network administrator in case of outages via email, pager or other alarms.

The typical Systems Administrator, or sysadmin, leans towards the software and NOS (Network Operating System) side of things. Systems Administrators install software releases, upgrades, and patches, resolve software related problems and performs system backups and recovery.

• Basic computer networking terms defined
• OSI model explained in simple terms
• OSI defined: the details of the OSI model.
• The Physical Layer of the OSI model
• The Physical Layer: data communications definitions
• The Physical Layer: Fast Ethernet Specifications
• Physical Layer Topology
• The Data Link Layer of the OSI model
• The Network Layer of the OSI model
• Packet switching explained in simple terms
• The transport layer is layer four of the OSI model.
• The Internet family of protocols the TCP/IP protocol suite
• The evolution of the Internet and the birth of TCP/IP