Wiley 978-0-470-89189-6 Datasheet

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Chapter 1
Junos Is Everywhere
You Need to Be
In This Chapter
Understanding the functions of a network operating system
Discovering how Junos OS is different
Looking beyond the operating system to the Junos Platform
T
he Junos operating system (Junos OS) is the software that runs network-
ing and security devices from Juniper Networks. Administrators use
Junos OS to set up devices and connect them together in a network, and
dictate how the devices move, service, and secure traffic across the network.
They also use it to monitor and, when necessary, restore the network.
Note: In this book, we use both Junos OS and Junos as one and the same.
This chapter introduces Junos OS by describing the functions of a network
operating system and then discussing how they work in Junos. The chapter
also explores key differences in how Juniper develops Junos software versus
how other vendors create their network operating systems, and introduces
additional components of the Junos portfolio.
Functions of a Network OS
Networks consist of specialized devices that pass along traffic from one to
another. Each device must know what to do with each arriving bundle of traf-
fic, or packet, so that the packet can continue its journey to its destination.
The devices perform three primary functions to process each packet:
Controls where the device sends the packets.
Applies services such as prioritization or security.
Forwards the packet to the next connecting device.
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Summary of Contents

Page 1 - You Need to Be

Chapter 1Junos Is Everywhere You Need to BeIn This Chapter▶ Understanding the functions of a network operating system▶ Discovering how Junos OS is dif

Page 2 - Service functions

18Part I: Discovering Junos OS managed by the network provider, but also those managed by the user. Once installed, the client provides secure, authen

Page 3 - Forwarding functions

10Part I: Discovering Junos OS These actions are the primary functions of the network operating system that runs on the device. In simplest terms, the

Page 4 - World-class architecture

11 Chapter 1: Junos Is Everywhere You Need to BeThis is just one example of where you may want to define a few of those extra rules that your network

Page 5 - It’s all under control

12Part I: Discovering Junos OS Taking a Peek Inside the Junos OSHow engineers design a network operating system impacts the reliability, security, sca

Page 6 - Moving forward

13 Chapter 1: Junos Is Everywhere You Need to BeDo you want faster platforms in your network? That’s like asking if you’d like to have today off (with

Page 7 - Developing Junos OS

14Part I: Discovering Junos OS You may be wondering if you have a way in Junos OS to protect the control plane itself from a security attack. Yes, you

Page 8 - Beyond the OS

15 Chapter 1: Junos Is Everywhere You Need to BeWhat about a minor hiccup in SNMP bringing down your whole system? That’s another misfortune that you

Page 9 - Junos Pulse

16Part I: Discovering Junos OS When it’s time to upgrade, you simply choose a higher release number, and not only do you get all the newly developed f

Page 10 - Part I: Discovering Junos OS

17 Chapter 1: Junos Is Everywhere You Need to BeAs part of the Junos Platform, Juniper provides a set of programming inter-faces and software developm

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