Diaz - CCNA Routing and Switching 200-125 certification guide: the ultimate solution for passing the CCNA certification and boosting your networking career

, Internetworking Models, in this chapter, the reader will be introduced to the basics of networking an introduction the layered approach. Such as, the OSI model and its advantages also, we will be discussing the different layers that exist and make the distinction between the upper layers and lower layers that make up the OSI model.

, Ethernet Networking and Data Encapsulations , in this chapter, the reader will be introduced to the networking type called Ethernet, they will be learning how packets flow in a network and when they can flow based on the access method used in Ethernet Network called CSMA/CD. Readers will learn the differences between collision domains and broadcast domains and of course the cabling of this type of network.

, Introducing the TCP/IP , in this chapter, the reader will be introduced to a brief history of the TCP/IP model and the DoD model, and you will gain an understanding of what protocols work on each layer and how to map the TCP/IP model to the OSI model and see the comparisons. Also, we will go over the basics of IPv4, it terminology and the hierarchical approach it uses, also to round off the chapter we will learn the different types of addresses that exits within an IPv4 world.

, Subnetting in IPv4 , this chapter, will show readers how to subnet a Class C, Class B and Class A addresses. Learning how to subnet is an essential part in networking. This is the process of how one can logically segment a network. The readers would learn how to increase the number of broadcast domains while decreasing the amount of broadcast or noise in the Network.

, Variable Length Subnet Mask and Route Summarization , readers will learn how not to waste IP address in their networks. Meaning, they would only use the IPs needed to service their network. This will be presented in a form of a diagram or formula that will simplify the process of calculating VLSM. In networks, the goal of an Engineer is to minimize the routing tables on a router. The reason for this, is so that the router is not overwhelmed with the exuberant number of network addresses. Therefore, readers will be learning how to minimize the routing table using Route Summarization. Which simply means, taking multiple, smaller networks and combining them into one big network, by adjusting the prefix length.

, The IOS User Interface , in this chapter, the reader will be learning the Cisco Internetworking Operating system. They will learn how to connect to a Cisco Router or Switch, navigate the Command Line Interface or CLI and learn the different router modes and switch modes. We will also go into configuring basic administrative commands on both the router and the switch and of course how to view your configurations, save or delete them.