Targeting JNCIA
Study Guide for Exam JN0-201
by
Book Cover & Preview Text
M-series routers
have two major architectural components: the Routing Engine (RE) and the Packet-Forwarding
Engine (PFE). The RE and PFE separate the control plane and the forwarding
plane within the router. The RE contains routing protocol overhead and route
table information. The PFE’s primary
function is the forwarding of production traffic given the information supplied
by the RE. While operating independently, the RE and PFE communicate to each
other over a 100 Mbs internal link (known as fxp1). This separation of the control and forwarding planes allows the
RE to process control packets, such as routing updates, without negatively
impacting the performance of the PFE or throughput of the router.
This chapter will
cover the hardware of Juniper Networks M-series routers. While there are a number of subtle
differences between the platforms, Juniper has endeavored to make their routers
have a common feel to them, regardless of model. This will no doubt become apparent when you review the software
section, but also rings true for hardware.
The most notable common thread for the M-series routing architecture is
the separation of the control plane from the forwarding plane. This design allows the router to process
routing updates without reducing its ability to maintain line-rate
forwarding. By the end of this chapter
you should be able to:
Identify the
different M-series routers.
Recognize different
hardware components and how they relate to the boot process.
Identify the primary
hardware components of each M-series router.
Understand the
Application Specific Integrated Circuit (ASIC) layout.
Explain packet flow
through the ASICs.
The JNCIA focuses
upon the widely available M-series Juniper routers. Recently, Juniper has unveiled its next generation of core
routers, the T-Series. However, as the
current exam does not focus upon these particular routers, neither will this
chapter.
In
this section you will learn about the dynamic routing protocol OSPF and its
fundamental concepts. By the end of
this chapter you should understand and be able to define:
The
purpose of Link-state routing protocols
Route
path selection in OSPF
Operation
of the Hello protocol
Stages
of neighbor adjacency
Link-state
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Book Details
About the Book
Targeting JNCIA Study Guide for the Juniper Networks Certified Internet Associate written exam (JN0-201).
Get ready to pass the first of the new certification examinations available from Juniper Networks with Targeting JNCIA. Juniper Networks supplies cutting edge networking hardware and their new Technical Certification Program gives a benchmark measurement necessary for ensuring competence when working with these technologies. This book will enable you to tackle the networking concepts and troubleshooting problems encountered on the JN0-201 exam. Topics include Juniper Networks platform architecture, hardware, packet-flow, Juniper Operating System (JUNOS), dynamic routing protocols (RIP, OSPF, IS-IS, BGP), Multi-protocol Label Switching (MPLS), Multicast, and routing policy. Chapters are broken down into easily understandable segments that cover the background, theory, and applications of each portion of the technology as needed for the examination. Key points of importance are reviewed at the end of every section along with references for additional detailed information. Over 100 sample quiz questions test your knowledge of the concepts most relevant to the exam.
About the Author
John Jacobs (JNCIA, CCNA, MCSE) started in the networking industry in the mid-1990s building local area networks. His interest soon shifted to wide-area networking and the unbounded potential held within. After working in operations for a startup DSL carrier, Rhythms Netconnections, he is currently employed as a Network Operations Engineer for a Tier 1 ISP.
Jeff Ringwelski (JNCIA, CCNA, CCNP) started networking in the late 1990s. His experience spans from maintaining small business connectivity to working in national carrier operations. He is currently a Technical Lead with a Tier 1 telecommunications service provider.
Tyler Wessels (JNCIA,
CCNA) started in the networking industry in the mid-1990s working as a network
technician for PSINet Inc. With a desire for a greater challenge he moved on to
work for another global Tier 1 ISP as a Network Operations Engineer where he
has applied and expanded his IP routing and switching knowledge.