JUNOS Enterprise Routing

How to Use This Book

Let’s look at some specifics on how this book can help you. We’ll talk about what we cover in the various chapters, how the book is laid out, and some resources to help you along the way. To start, let’s discuss what you should know before you begin to read this book.

We are assuming a certain level of knowledge on the reader’s part. This is important because we are assuming you to be conversant in the following topic areas:

OSI model

The Open Systems Interconnection (OSI) model defines seven different layers of technology: Physical, Data Link, Network, Transport, Session, Presentation, and Application. This model allows network engineers and network vendors to easily discuss and apply technology to a specific OSI level. This segmentation lets engineers divide the overall problem of getting one application to talk to another into discrete parts and more manageable sections. Each level has certain attributes that describe it and each level interacts with its neighboring levels in a very well-defined manner.

Switches

These devices operate at Layer 2 of the OSI model and use logical local addressing to move frames across a network. Devices in this category include Ethernet, Asynchronous Transfer Mode (ATM), and Frame Relay switches.

Routers

These devices operate at Layer 3 of the OSI model and connect IP subnets to each other. Routers move packets across a network in a hop-by-hop fashion.

Ethernet

These broadcast domains connect multiple hosts together on a common ...