Book Image

CCENT/CCNA: ICND1 100-105 Certification Guide

By : Bekim Dauti
Book Image

CCENT/CCNA: ICND1 100-105 Certification Guide

By: Bekim Dauti

Overview of this book

CCENT is the entry-level certification for those looking to venture into the networking world. This guide will help you stay up-to date with your networking skills. This book starts with the basics and will take you through everything essential to pass the certification exam. It extensively covers IPv4 and IPv6 addressing, IP data networks, switching and routing, network security, and much more—all in some detail. This guide will provide real-world examples with a bunch of hands-on labs to give you immense expertise in important networking tasks, with a practical approach. Each chapter consists of practice questions to help you take up a challenge from what you have procured. This book ends with mock tests with several examples to help you confidently pass the certification. This Certification Guide consists of everything you need to know in order to pass the ICND 1 100-105 Exam, thus obtaining a CCENT certification. However, practicing with real switches and routers or a switch or router simulator will help you succeed.
Table of Contents (18 chapters)
10
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Appendix G: Graphical Network Simulator-3 (GNS3)

Boot up the router

Just like a PC, a router boots up too. The power-on self test (POST) and bootstrap program also run on the router's boot process. Furthermore, hardware components such as CPU chips, RAM/DRAM, NVRAM, and Flash memory are initialized. Finally, the operating system IOS is located and loaded into the RAM/DRAM. That said, this section discusses the router's boot process.

Router's boot up process

Just like a switch, a router has a boot up process. It consists of several phases, and in each phase, significant activities are carried out. The following steps represent the router's boot process, when it is powered on:

  1. As electricity starts flowing into the router's internal circuitry (more...