This publication provides internetworking design and implementation case studies and examples,
with the intent to help you identify and implement practical internetworking strategies that are both
flexible and scalable.
This publication was developed to assist professionals preparing for Cisco Certified Internetwork
Expert (CCIE) candidacy, though it is a valuable resource for all internetworking professionals. It is
designed for use in conjunction with other Cisco manuals or as a standalone reference.
Data communications technologies are evolving and expanding at an unparalleled rate. The growth
in demand for Internet access and intranet services continues to fuel rapid technical adaptation by
both implementers and developers. Unfortunately, creating an information resource such as the
Internetworking Technology Overview requires a certain recognition by its authors that some
information is likely to be obsolete the day it appears in print.
Internetworks come in a variety of topologies and levels of complexity—from single-protocol,
point-to-point links connecting cross-town campuses, to highly meshed, large-scale wide-area
networks (WANs) traversing multiple time zones and international boundaries. The industry trend is
toward increasingly complex environments, involving multiple media types, multiple protocols, and
often interconnection to “unknown” networks. Unknown networks may be defined as a transit
network belonging to a Internet service provider (ISP) or a telco that interconnects your private
The products and specifications, configurations, and other technical information regarding the products
in this manual are subject to change without notice. All statements, technical information, and
recommendations in this manual are believed to be accurate but are presented without warranty of any
kind, express or implied. You must take full responsibility for their application of any products
specified in this manual.
Internetworking---the communication between two or more networks---encompasses every aspect of
connecting computers together. Internetworks have grown to support vastly disparate end-system
communication requirements. An internetwork requires many protocols and features to permit scalability
and manageability without constant manual intervention. Large internetworks can consist of the
following three distinct components:
Internetworking: an overview of concepts, terminology, and technology underlying the TCP/IP Internet protocol suite and the architecture of an internet. Talking about computer networks often means talking about Unix. Of course, Unix is not the only operating
system with network capabilities, nor will it remain a frontrunner forever, but it has been in the networking business
for a long time, and will surely continue to be for some time to come.
This Study Guide is targeted specifically at people who wish to take the Cisco CCNP 640-606 – Support
(CIT) exam. This information in this Study Guide is specific to the exam. It is not a complete reference work.
Although our Study Guides are aimed at new comers to the world of IT, the concepts dealt with in this Study
Guide are complex and require an understanding of material provided for the Cisco Certified Network
Associate (CCNA) exam 640-607. Knowledge of CompTIA’s A+ course would also be advantageous but is
not a requirement....
One of the keys to understanding Cisco is the OSI model. The OSI model permits
people to understand how internetwork works and it serves as a guideline or framework
for creating and implementing network standards, devices, and internetworking schemes.
Some of the advantages of the OSI model include:
• It allows for the breaking down of complex operation into simple elements;
• Enables engineers to specialize the design and development of modular elements;
• It provides standards for plug and play and multivendor integration....
Internetworking—the communication between two or more networks—encompasses every aspect
of connecting computers together. Internetworks have grown to support vastly disparate
end-system communication requirements. An internetwork requires many protocols and features to
permit scalability and manageability without constant manual intervention. Large internetworks can
consist of the following three distinct components:
This case study addresses the issue of integrating Routing Information Protocol (RIP) networks with Open Shortest
Path First (OSPF) networks. Most OSPF networks also use RIP to communicate with hosts or to communicate
with portions of the internetwork that do not use OSPF. Cisco supports both the RIP and OSPF protocols and
provides a way to exchange routing information between RIP and OSPF networks. This case study provides
examples of how to complete the following phases in redistributing information between RIP and OSPF networks,
including the following topics:...
About This Study Guide
This Study Guide is based on the current pool of exam questions for the 640-901 – Building Scalable Cisco
Internetworks (BSCI) exam. As such it provides all the information required to pass the Cisco 640-901 exam
and is organized around the specific skills that are tested in that exam. Thus, the information contained in
this Study Guide is specific to the 640-901 exam and does not represent a complete reference work on the
subject of Building Scalable Cisco Internetworks.