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60 Chapter 2: Business and Technical Requirements
Foundation Summary
This section is a collection of tables and figures that provides a convenient review of many key
concepts in this chapter. If you are already comfortable with the topics in this chapter, this
summary might help you recall a few details. If you have just read this chapter, this review
should help solidify some key facts. If you are doing your final preparation before the exam,
these tables and figures are a convenient way to review the day before the exam.
As soon as you understand the business problem, you can achieve the solution to the problem
by implementing the proposed design.
In new technology, the two largest factors in determining the network design are cost and
availability. Budgetary considerations such as the cost of software, the cost of equipment, the
cost of maintenance, and the recurring monthly costs play a huge role in determining what type
of design will be implemented.
Defining the business requirements provides the necessary supporting data and financial
models to support an internetwork's design and implementation. While cost savings should be
an obvious benefit realized by the network design, other substantial benefits such as optimizing
operations, innovating products and services, and providing better customer service should be
realized as well.
The CCDP must be able to recognize the customer's primary campus LAN design issues and
the driving forces in the dynamic environment. The CCDP must design with regard to the
ongoing changes required by the network. Use switches to solve media contention problems.
Use routes to solve protocol problems. Use ATM or some other high-speed transport protocol
to solve transport problems.
Tables 2-2, 2-3, and 2-4 provide a quick reference for a number of important items covered in
this chapter.
NOTE
The maximum topology for all cable types subscribes to the 5-4-3 rule. Five segments and four
repeaters are allowed per collision domain. Only three segments can have end systems.
Table 2-2
Cable Limitations for 10 Mbps Ethernet
Cable
Type
Topology
Type of
Cable
Maximum Cable
Length (in
Meters)
Maximum
Connections
per Cable
Maximum
Collision
Domain (in
Meters)
10Base5
Bus
Thick coax
500
100
2,500
10Base2
Bus
Thin coax
185
30
2,500
10BaseT
Star
UTP
100 from hub to
station
2
2,500
87200333.book Page 60 Wednesday, August 22, 2001 2:18 PM