Book Image

Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide

By : Glen D. Singh
Book Image

Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide

By: Glen D. Singh

Overview of this book

In the dynamic technology landscape, staying on top of the latest technology trends is a must, especially if you want to build a career in network administration. Achieving CCNA 200-301 certification will validate your knowledge of networking concepts, and this book will help you to do just that. This exam guide focuses on the fundamentals to help you gain a high-level understanding of networking, security, IP connectivity, IP services, programmability, and automation. Starting with the functions of various networking components, you’ll discover how they are used to build and improve an enterprise network. You’ll then delve into configuring networking devices using a command-line interface (CLI) to provide network access, services, security, connectivity, and management. The book covers important aspects of network engineering using a variety of hands-on labs and real-world scenarios that will help you gain essential practical skills. As you make progress, this CCNA certification study guide will help you get to grips with the solutions and technologies that you need to implement and administer a broad range of modern networks and IT infrastructures. By the end of this book, you’ll have gained the confidence to pass the Cisco CCNA 200-301 exam on the first attempt and be well-versed in a variety of network administration and security engineering solutions.
Table of Contents (26 chapters)
1
Section 1: Network Fundamentals
6
Section 2: Network Access
9
Section 3: IP Connectivity
12
Section 4: IP Services
15
Section 5: Security Fundamentals
20
Section 6: Automation and Programmability
22
Chapter 16: Mock Exam 1
23
Chapter 17: Mock Exam 2

The challenge of using IPv4 on the internet

One of the many issues we face is that there aren't enough public IPv4 addresses to assign to each unique device on the internet. As you learned in Chapter 3, IP Addressing and Subnetting, each device that is directly connected to the internet must be assigned a unique IP address. Furthermore, there are 232 public IPv4 addresses, which means that there are approximately 4,294,967,296 public IPv4 addresses that are routable on the internet. This number seems huge, but the reality is that most internet-connected devices have already been assigned a public IPv4 address and the rest of the public IPv4 pool is reserved by various organizations for special use.

In the world today, there are more than 4 billion devices connected to the internet. How is it possible to have more devices online than the number of available public IPv4 addresses? RFC 1918 defines three classes of IPv4 addresses that are assignable on private networks and are...