This open textbook aims to fill the gap between the open-source implementations and the open-source network specifications by providing a detailed but pedagogical description of the key principles that guide the operation of the Internet.

Table of Contents
1 Preface

2 Introduction

2.1 Services and protocols
2.2 The reference models
2.3 Organisation of the book
3 The application Layer

3.1 Principles
3.2 Application-level protocols
3.3 Writing simple networked applications
3.4 Summary
3.5 Exercises
4 The transport layer

4.1 Principles of a reliable transport protocol
4.2 The User Datagram Protocol
4.3 The Transmission Control Protocol
4.4 Summary
4.5 Exercises
5 The network layer

5.1 Principles
5.2 Internet Protocol
5.3 Routing in IP networks
5.4 Summary
5.5 Exercises
6 The datalink layer and the Local Area Networks

6.1 Principles
6.2 Medium Access Control
6.3 Datalink layer technologies
6.4 Summary
6.5 Exercises
7 Glossary

8 Bibliography

9 Indices and tables

This open textbook aims to fill the gap between the open-source implementations and the open-source network specifications by providing a detailed but pedagogical description of the key principles that guide the operation of the Internet.

Suppose you want to build a computer network, one that has the potential to grow to global proportions and to support applications as diverse as teleconferencing, video on demand, electronic commerce, distributed computing, and digital libraries. What available technologies would serve as the underlying building blocks, and what kind of software architecture would you design to integrate these building blocks into an effective communication service? Answering this question is the overriding goal of this book—to describe the available building materials and then to show how they can be used to construct a network from the ground up.

Topics on the engineering and analysis of network protocols and architecture, including: architectural principles for designing heterogeneous networks; congestion control; unicast and multicast routing; wireless and mobile networking; network quality of service; router design; network security; streaming and multicast applications; naming; content distribution; and peer-to-peer networking. Readings from original research papers, industry white papers, and Internet RFCs. Semester-long project and paper.

This book is meant to provide you with an interactive experience as you learn to program. You can read the text, watch videos, and write and execute Python code. In addition to simply executing code, there is a unique feature called codelens that allows you to control the flow of execution in order to gain a better understanding of how the program works.

Table of Contents:
Scratch
Reeborg
Python - Getting Started
Python - Turtle Drawings (Loops and Functions)
Python - Functions in Detail
Python - Micro:bit and More Functions
Python - Image Processing
Python - Strings
Python - Lists
Student-Directed Research
End of Semester Review
Computing and Society
Career Exploration

This textbook covers the traditional introductory Computer Science I topics but takes a unique approach. Topics are covered in a language-agnostic manner in the first part with supplemental parts that cover the same concepts in a specific language. The current version covers C, Java, and PHP. This textbook as been used in several Computer Science I sections over multiple years at the University of Nebraska-Lincoln

Table of Contents
I. The C Programming Language

II. The Java Programming Language

III. The PHP Programming Language

This textbook covers the traditional introductory Computer Science I topics but takes a unique approach. Topics are covered in a language-agnostic manner in the first part with supplemental parts that cover the same concepts in a specific language. The current version covers C, Java, and PHP. This textbook as been used in several Computer Science I sections over multiple years at the University of Nebraska-Lincoln.

This course explores a variety of topics in computing, such as the following: the components of a computer, common computer terminology, an introduction to the Internet, computer security and privacy, computer troubleshooting techniques, and steps to maintain the life of your computer.

This introductory class of computer skills is comprised of units that focus on basic computer hardware and the following applications: Word 2010, Excel 2010, PowerPoint 2010, Photo Gallery, and Audacity. Most units begin with YouTube overviews or 'how to' presentations followed by step by step guides to using aspects of the application and then have assessment exercises and conclude with a final project for evaluation.

The primary goal of the course is to develop computer professionals able to explore the implications of what computing professionals create as part of their work and how this impacts society at large. It will help the learner to understand the development, application and consequences of computing technology in relation to society.

In this course, you will learn about the history of computing; principles, concepts and terminology of computing, software uses, application and development; role of computing professionals; current computing technologies and their use in everyday life, examination of variety of computing perspectives such as access to information, privacy, computer security, virtual society, transformation of work and workplace; social, ethical and legal issues and their implications to computing in our daily lives as a society; professional aspects of computing.

Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Identify which letter corresponds most closely to the formation of Earth. a. C ...

Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Identify which letter corresponds most closely to the extinction of the ...

Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Identify which letter corresponds most closely to the first appearance in the ...

Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Identify which letter corresponds most closely to the age of the oldest known ...

Match the features in the relative time diagram below with the events described in the short sentences. Assume all rocks are sedimentary unless otherwise indicated. What is the best estimate of the age of F if A is ...

Used for students receiving Advanced Placement credit and transfer credit. Program of study or research to be arranged with a Department faculty member. Written report required. Permission of Department required.

"Concept Development Studies in Chemistry" is an on-line textbook for an Introductory General Chemistry course. Each module develops a central concept in Chemistry from experimental observations and inductive reasoning. This approach complements an interactive or active learning teaching approach.

Associated "Topic Development with Concept Mapping Lesson" plan and handouts are also available for download and adaptation in the Guttman Community College OER collection in CUNY Academic Works.

This module contains study guides for chapters 11-15 and 19-21 in the Concepts of Biology textbook. The study guides are a list of questions that Instructors can give to students to help them prepare for tests. They can also be used for homework or in-class assignments.

Concepts of Biology is designed for the introductory biology course for nonmajors taught at most two- and four-year colleges. The scope, sequence, and level of the program are designed to match typical course syllabi in the market. Concepts of Biology includes interesting applications, features a rich art program, and conveys the major themes of biology.