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

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

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Product type Paperback
Published in Nov 2020
Publisher Packt
ISBN-13 9781800208094
Length 764 pages
Edition 1st Edition
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Author (1):
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Glen D. Singh Glen D. Singh
Author Profile Icon Glen D. Singh
Glen D. Singh
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Table of Contents (26) Chapters Close

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

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...

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