To understand the content of this book, it is recommended that you have basic knowledge in computer networks. If you are certified with CompTIA Network +, that would be a good foundation for you to advance your knowledge about computer networks through this book.

As you know, it does not make sense to learn computer networks without doing any practical work. Therefore, the suggestions are to practice making cables such as straight through, crossover, and roll over. Setting up a LAN with at least a Cisco switch and router. And download emulators and simulators like Putty and Tera Term, Packet Tracer and GNS3, and Wireshark. All the download links are included on the book.

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it from https://www.packtpub.com/sites/default/files/downloads/CCENTCCNAICND1100105CertificationGuide_ColorImages.pdf.

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "In the privileged EXEC prompt, enter the show running-config (or show startup-config) command and press Enter."

Any command-line input or output is written as follows:

C:\>ping 127.0.0.1

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example:

In Windows 10, click Yes to let the app make changes to your device: