Book Image

CompTIA Network+ N10-008 Certification Guide - Second Edition

By : Glen D. Singh
Book Image

CompTIA Network+ N10-008 Certification Guide - Second Edition

By: Glen D. Singh

Overview of this book

This book helps you to easily understand core networking concepts without the need of prior industry experience or knowledge within this fi eld of study. This updated second edition of the CompTIA Network+ N10-008 Certification Guide begins by introducing you to the core fundamentals of networking technologies and concepts, before progressing to intermediate and advanced topics using a student-centric approach. You’ll explore best practices for designing and implementing a resilient and scalable network infrastructure to support modern applications and services. Additionally, you’ll learn network security concepts and technologies to effectively secure organizations from cyber attacks and threats. The book also shows you how to efficiently discover and resolve networking issues using common troubleshooting techniques. By the end of this book, you’ll have gained sufficient knowledge to efficiently design, implement, and maintain a network infrastructure as a successful network professional within the industry. You’ll also have gained knowledge of all the official CompTIA Network+ N10-008 exam objectives, networking technologies, and how to apply your skills in the real world.
Table of Contents (26 chapters)
Part 1: Networking Concepts
Part 2: Network Implementation
Part 3: Network Operations
Part 4: Network Security and Troubleshooting
Chapter 18: Practice Exam

Understanding interface issues

Network professionals can log into a networking device, such as a switch or router, and check the status of each physical and logical interface on the device. By checking the interface’s status, network professionals can quickly determine whether an interface has been misconfigured or is experiencing a physical issue that may result in connectivity issues between the sender and receiver devices on the network. In the following subsections, you will explore various status types that are used to identify a network-related issue on a device.

Checking the link state (up/down)

If the link state is up, it’s an indication that the interface of a device is active and can both send and receive messages. The show interfaces command on Cisco IOS switches and routers allows network professionals to determine the status of an interface, as shown here:

Figure 11.10 – Verifying the link’s status

As shown in...