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OSI Layer 3 - Network Layer

Posted in The OSI Model

The Network layer is responsible for routing through an internetwork and for networking addressing. This means that the Network layer is responsible for transporting traffic between devices that are not locally attached. Routers, or other layer-3 devices, are specified at the Network layer and provide routing services in an internetwork.

OSI Layer 2 - Datalink Layer

Posted in The OSI Model

The Datalink ensures that messages are delivered to the proper device and translates messages from the Network layer into bits for the Physical layer to transmit. It formats the message into data frames (notice how we are not using the term segments) and adds a customized header containing the hardware destination and source address.

OSI Layer 1 - Physical Layer

Posted in The OSI Model

The Physical layer has two responsibilities: it sends bits and receives bits. Bits come only in values of 1 or 0. The Physical layer communicates directly with the various types of actual communication media. Different kinds of media represent these bit values in different ways. Specific protocols are needed for each type of media to describe the proper bit patterns to be used, how data is encoded into media signals and the various qualities of the physical media's attachment interface.

Subnetting Guidelines

Posted in Subnetting

Introduction

There is always that day when you are called upon to provide a solution to a network problem. The number of problems that can occur in a network are numerous and believe it or not, most of them can be avoided if the initial design and installation of the network are done properly.

This article covers subnetting guidelines. These are used to correctly design and implement networks of any size.

Subnet Routing & Communications

Posted in Subnetting

Introduction

Routing and Communication between subnets is the main topic here. This article analyses communications between subnets. We provide examples on different methods that can be used to enable subnet communications in an effective and secure manner. Generally, this article puts in practice all subnetting theory covered until now.

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