Lecture 2: Architecture

Sources of network delay

This lecture describes many of the design decisions that have to be made to generate an architecture for inter-networking. The current networking architecture may seem obvious from hindsight, but is actually built on decades of careful thought, experimentation and research. We will describe the four main sources of delay in the network and determine how they are affected by architectural choices. Then, we will discuss the very idea of building a layered architecture, especially the advantages and disadvantages of having layers. Finally, we will describe the OSI model and take a quick look at what the layers all do.

Lesson Objectives

By the end of this lesson, the student will be able to: