1introjunos

Introduction to JUNOS Software

The Juniper Networks Technical Certification Program (JNTCP) consists of forplatfo m-specific, multitiered tracks that enable participants to demonstrate, through a combination of written proficiency exams and handsconfiguration and

JNTCP Reproduction

tr ublesh ting exams, competence with Juniper Networks technology. Successful candidates demonstrate thorough understanding of Internet and security

Notechn l gies and Juniper Networks platform configuration and troubleshooting skills. You can learn more information about the JNTCP at

h p://www.juniper.net/training/certification/.

Course Introduction • Chapter 1–11

Introduction to JUNOS Software

Certification LevelsReproduction

Each JNTCP track has one to four certification levels. Associate-level and Specialist-level exams are computer-based exams composed of multiple choice questions.forThese computer-based exams ar administered at Prometric testing centers w rldwide and have no prerequisite certification requirements.

Professional-level and Expert-level exams are composed of hands-on lab exercises Notthat are administered at select Juniper Networks testing centers. Professional-level

and Expert-level exams require that you first obtain the next lower certification in the track. Please visit the JNTCP Web site at http://www.juniper.net/training/certification/ for detailed exam information, exam pricing, and exam registration.

Chapter 1–12 • Course Introduction

Course Introduction • Chapter 1–13

Introduction to JUNOS Software

Any Questions?

Chapter 1–14 • Course Introduction

Introduction to JUNOS Software

This Chapter DiscussReproductions:

• JUNOS Software and its basic design architecture;

•forT affic p ocessing for transi and exception traffic; and

• JUNOS platforms. Not

Chapter 2–2 • JUNOS Software Fundamentals

JUNOS Software Fundamentals • Chapter 2–3

Introduction to JUNOS Software

Robust, Modular, andReproductionScalable

JUNOS Software functionality is compartmentalized into multiple software processes. Each process handles a portion of the device’s functionality. Each process runs in its own protectedformemo y space, ensuring that one process cannot directly interfere with another. When a single process fails, the entire system does not necessarily fail. This modularity also ensures that new features can be added with less likelihood of breaking current functionality.

NotJUNOS S ware is the trusted, secure network operating system powering the high-perf rmance network infrastructure offered by Juniper Networks. The JUNOS kernel is based on the FreeBSD UNIX operating system, which is an open source software system.

Chapter 2–4 • JUNOS Software Fundamentals

Introduction to JUNOS Software

Single SoftwareReproductionSource Code Base

All platforms running JUNOS Software use the same source code base within their forplatfo m-specific images. This design ensures that core features work in a consistent manner ac oss all platforms running JUNOS Software. Because many features and services a e configured and managed the same way, the setup tasks and ongoing maintenance and operation within your network is simplified.

Not

JUNOS Software Fundamentals • Chapter 2–5

Introduction to JUNOS Software

Separate Control andReproductionForwarding Planes

Another aspect of the JUNOS Software’s modularity is the separation of the control plane andforthe fo wa ding or data plane. The processes that control routing and switching protocols a cleanly separated from the processes that forward frames, packets, b th th ugh the device running JUNOS Software. This design allows you to tune each pr cess f r maximum performance and reliability. The separation of the

Notcon rol and orwarding planes is one of the key reasons why JUNOS Software can supp rt many different platforms from a common code base.

The slide illustrates a basic view of the JUNOS architecture and highlights the control and f rwarding planes. The control plane, shown above the dashed line on the slide, runs on the Routing Engine (RE). The RE is the brain of the platform; it is responsible for performing protocol updates and system management. The RE runs various protocol and management software processes that reside inside a protected memory environment. The RE is based on an X86 or PowerPC architecture, depending on the specific platform running JUNOS Software. The RE maintains the routing tables, bridging table, and primary forwarding table and connects to the Packet Forwarding Engine (PFE) through an internal link. Although all JUNOS platforms share this common design goal, the actual components that make up the control and forwarding planes vary between the different JUNOS platforms. For additional details about a specific JUNOS platform, see the technical publications at http://www.juniper.net/techpubs/.

Continued on next page.

Chapter 2–6 • JUNOS Software Fundamentals