tailieunhanh - Network+ Certification (Outline) - Chapter 1: Networking basics

Chapter summary: Computers communicate by using languages called protocols, protocols provide services to other protocols operating above and below them, a LAN uses a common network medium to connect computers in a relatively small area, a WAN uses an external network provider to connect LANs, broadband networks carry multiple signals at once, while baseband networks carry only one signal,. | 1 2 3 Chapter 1 Networking Basics The outline presents only the key points from the course textbook. It s not intended to be a complete recap of the textbook content presented in outline form. Where demonstrations are suggested or recommended it s assumed that the instructor will know the procedures for the demonstration or will find them in the course textbook. Some of the demonstrations require other equipment or network setup in addition to your class presentation computer. You should review each chapter outline before class to ensure that you have the proper equipment and connections in the classroom and that you know the correct procedure to perform the suggested demonstrations. The outlines are not included on the Student CD-ROM for this course. However you can certainly make them available to your students as a study aid if you wish. If you do so you might want to edit the file to remove some of the Instructor Notes before giving the outline to your students. Chapter Overview A. Network Communications B. The OSI Reference Model Chapter 1 Lesson 1 Network Communications 1. Signals and Protocols A. A data network is a group of computers connected by a network medium. 1. Network media cables of various types or wireless technologies B. The network medium carries signals between computers including the following types 1. Electric currents 2. Light pulses 3. Infrared 4. Radio waves C. Signals reduce complex information to the simplest possible form. D. Computers communicate by using a language called a protocol. E. Protocols can provide the following services 1. Packet acknowledgment. The transmission of a return message by the recipient to verify the receipt of a packet or packets a. A packet is the fundamental unit of data transmitted over a local area network LAN . 2. Segmentation. The division of a lengthy data stream into segments small enough to transmit over the network inside packets 3. Flow control. Messages sent by a receiving system that instruct the