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

ACL wildcard masks

When creating an ACE, you may need to specify a network ID and the subnet mask. However, within ACLs and ACEs, you cannot use a subnet mask as Cisco IOS on the router was not built or designed to accept subnet masks as part of an ACE. ACLs use a wildcard mask, which is a 32-bit binary string used by the Cisco IOS router to determine which bits within the address to match and which bits to ignore.

As with a subnet mask, ones and zeroes are used to indicate the network and host portions of an IP address. For example, the ones within a subnet mask are used to identify the network portion of an address, while the zeroes are used to identify the host portion. Within a wildcard mask, these bits are used for a different purpose. Here, the ones and zeroes are used to filter either a group of addresses or a single IP address to decide whether to permit or deny access to a network resource.

In a wildcard mask, the zeroes are used to match the corresponding bit value...