You're reading from Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide Begin a successful career in networking with CCNA 200-301 certification

Product type Paperback

Published in Nov 2020

Publisher Packt

ISBN-13 9781800208094

Length 764 pages

Edition 1st Edition

Tools

Cisco

Concepts

Network Security

Author (1):

Glen D. Singh

View More author details

Table of Contents (26) Chapters

Preface

1. Section 1: Network Fundamentals

2. Chapter 1: Introduction to Networking FREE CHAPTER

3. Chapter 2: Getting Started with Cisco IOS Devices

4. Chapter 3: IP Addressing and Subnetting

5. Chapter 4: Detecting Physical Issues, Wireless Architectures, and Virtualization

6. Section 2: Network Access

7. Chapter 5: Implementing VLANs, Layer 2 Discovery Protocols, and EtherChannels

8. Chapter 6: Understanding and Configuring Spanning-Tree

9. Section 3: IP Connectivity

10. Chapter 7: Interpreting Routing Components

11. Chapter 8: Understanding First Hop Redundancy, Static and Dynamic Routing

12. Section 4: IP Services

13. Chapter 9: Configuring Network Address Translation (NAT)

14. Chapter 10: Implementing Network Services and IP Operations

15. Section 5: Security Fundamentals

16. Chapter 11: Exploring Network Security

17. Chapter 12: Configuring Device Access Control and VPNs

18. Chapter 13: Implementing Access Control Lists

19. Chapter 14: Implementing Layer 2 and Wireless Security

20. Section 6: Automation and Programmability

21. Chapter 15: Network Automation and Programmability Techniques

22. Chapter 16: Mock Exam 1

23. Chapter 17: Mock Exam 2

24. Assessments

25. Other Books You May Enjoy

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Special IPv4 addresses

In the IPv4 address space, there are three special network blocks that are reserved for special usage. These special IPv4 addresses are as follows:

Loopback address
Test-Net
Link Local

In this section, we will look at each of their characteristics and use cases.

Loopback address

The loopback range of an address is built into the TCP/IP protocol suite. This range of addresses allows an application running on a host machine to communicate with an application on the same machine. To put it more simply, loopback addresses allow a host operating system to send network traffic to itself.

The network block is reserved for loopback and has the range 127.0.0.1/8 to 127.255.255.254/8. Therefore, to test the functionality of the TCP/IP protocol suite, you ping any address from the loopback range. Most commonly, network professionals ping the 127.0.0.1 address.