CCNA Data Center DCICN 640-911 Official Cert Guide (Donald Martinez's Library) by Wendell Odom & Chad Hintz

Author:Wendell Odom & Chad Hintz
Language: eng
Format: epub, mobi
Publisher: Cisco Press
Published: 2015-10-11T04:00:00+00:00

Chapter 13. Perspectives on IPv4 Subnetting

This chapter covers the following exam topics:

1.1 Describe the purpose and functions of various network devices

1.1.a Interpret a network diagram

1.3 Use the OSI and TCP/IP models and their associated protocols to explain how data flows in a network

1.3.a IP

3.1 Describe the operation and benefits of using private and public IP addressing

3.1.a Classful IP addressing

3.1.b RFC 1918

3.2 Describe the difference between IPv4 and IPv6 addressing scheme

3.2.a Comparative address space

Most entry-level networking jobs require you to operate and troubleshoot a network using a preexisting IP addressing and subnetting plan. The CCNA Data Center certification requires you to be ready to analyze preexisting IP addressing and subnetting information to perform typical operations tasks, like monitoring the network, reacting to possible problems, and troubleshooting those problems.

However, some exam questions, as well as many real-life issues at work, require that you understand the design of the network so that you can better operate the network. The process of monitoring any network requires that you continually answer the question, “Is the network working as designed?” If a problem exists, you must consider questions such as, “What happens when the network works normally, and what is different right now?” Both questions require you to understand the intended design of the network, including details of the IP addressing and subnetting design.

This chapter provides some perspectives and answers for the bigger issues in IPv4 addressing. What addresses can be used so that they work properly? What addresses should be used? When told to use certain numbers, what does that tell you about the choices made by some other network engineer? How do these choices impact the practical job of configuring switches, routers, hosts, and operating the network on a daily basis? This chapter hopes to answer these questions while revealing details of how IPv4 addresses work.

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