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

Subnet mask

An IP address is not complete without being associated with a subnet (work) mask. The subnet mask has the following characteristics and responsibilities on a network:

  • IPv4 subnet masks are 32 bits in length, while IPv6 subnet masks are 128 bits.
  • A subnet mask is used to identify both the network and host portions of an IP address.
  • A subnet mask is used to assist us and network devices in determining the total number of networks, as well as the total usable IP addresses that exist on an IP subnet.
  • The subnet mask is used to help a host device determine whether a packet should be sent to the default gateway if the intended destination is beyond the local network.

As we have learned in the previous sections, there are typically three classes (A, B, and C) of assignable IP addresses for both public and private address spaces. Similarly, there are three default subnet masks for each class of IPv4 address.

The following are the three default subnet...