Book Image

CompTIA Network+ Certification Guide

By : Glen D. Singh, Rishi Latchmepersad
Book Image

CompTIA Network+ Certification Guide

By: Glen D. Singh, Rishi Latchmepersad

Overview of this book

CompTIA certified professionals have always had the upper hand in the information technology industry. This book will be your ideal guide to efficiently passing and achieving this certification. Learn from industry experts and implement their practices to resolve complex IT issues. This book revolves around networking concepts where readers will learn topics like network architecture, security, network monitoring, and troubleshooting. This book will not only prepare the readers conceptually but will also help them pass the N10-007 exam. This guide will also provide practice exercise after every chapter where readers can ensure their concepts are clear. By the end of this book, readers will leverage this guide and the included practice questions to boost their confidence in appearing for the actual certificate.
Table of Contents (17 chapters)

The sublayers of Ethernet

Let's talk a bit more about layers 1 and 2 of the OSI model, the Data Link Layer and the Physical Layer.

The Data Link Layer

The Data Link Layer (layer 2) of the OSI model is responsible for allowing the messages of the upper layers to access the network. It also controls how the data is placed onto the physical network (media), and handles error detection.

Within the Data Link Layer there are two sublayers, the Logical Link Control (LLC) sublayer and the Media Access Control (MAC) sublayer. Switches only operate at this second sublayer, as they are only able to read and understand frames containing MAC addresses.

At the Data Link Layer, the PDU is known as a frame.
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