In addition, you can ?¬?nd many references to standards, documents, books, and
websites to help you understand networking concepts. At the end of each chapter, your
comprehension and knowledge are tested by review questions prepared by a certi?¬?ed Cisco
instructor.
NOTE The operating systems used in this book are Cisco IOS Software Release 12.4
for the routers, and Cisco Catalyst 2960 is based on Cisco IOS Software Release 12.2.
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This chapter includes the
following sections:
?– Chapter Objectives
?– Cisco IOS CLI Functions
?– Chapter Summary
?– Review Questions
C H A P T E R 1
Review of Cisco IOS for
Routers and Switches
As small networks grow and become more complex, greater functionality and control over
network components, delivered through more sophisticated network devices such as switches
and routers, become critical. Most Cisco hardware platforms implement Cisco IOS Software,
including switches and routers. This software enables network services in Cisco products,
including carrying the chosen network protocols and functions, controlling access and
prohibiting unauthorized network use, and adding interfaces and capability as needed for
network growth.
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