A free app for Android, by LeopardDevelopers.

Cisco CCNA is a course for beginners in the field of networking. It is intended for people who have an interest in networking and want to learn more about it. This course will teach you the fundamentals of networking in a simple and easy-to-understand way. You will not need to have any previous knowledge.

The course consists of an introduction, an explanation of the OSI model, a description of the TCP/IP reference model, and a basic knowledge of networking. In addition, it includes a LAN, a network hub, a network switch, a router, and a computer. You will learn about the various elements of the network, how they work, and what you need to do to configure your network.