Ashiqkhan

The following notes discuss the data link layer, the second layer of the OSI model. It describes the functions of the data link layer. In addition, it compares and contrasts two sublayers of the OSI model, which are the logical link control layer and the media access control layer. Moreover, it analyzes VLANs, MAC addresses, Ethertype, frame types, switches, duration, etc.

The following notes discuss the OSI and TCP conceptual model. It will focus on the history of protocols and how they laid the foundation for modern computing. In addition, it describes each layer of abstraction which allow devices across the web to communicate with each other. Moreover, it will discuss the similarities and differences between both models.

The following notes will discuss the basics of the JavaScript programming language, different types of evaluation methods, and general categories of languages. It will teach students how to print to console, write comments, declare variables, and create other functions. In addition, it will discuss the difference between lazy and eager evaluation as well as the difference between a compiled language and an interpreted language.

The following notes discuss the observer pattern. According to them, the observer pattern is a design pattern where an object can keep a list of its dependent variables and functions. It discusses what an observer pattern is in detail. In addition, it discusses what a subject class is as well as what node patterns are.

The notes discuss the physical layer. It discusses the functions of the physical layer, the mediums used such as cables, and devices that operate on it such as hubs. Furthermore, it discusses protocols that operate on the physical layer such as CSMA/CA and CSMA/CD. It discusses about its history and how it evolved to make better devices.

The notes discuss asynchronous programming in JavaScript. It begins by discussing the "lib uv" library, a set of words in C that support asynchronous I/O based operations by the usage of the event loop. In addition, it analyzes a protocol called DNS, a protocol that converts human-readable domain names into IP addresses. Moreover, it lists important information about an event loop.