Chapter 2 – Analyzing Technical Goals and Trade-offs.docx
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Department
Information Technology Management
Course
ITM 600
Professor
Robert Hudyma
Semester
Fall

Description
Chapter 2Analyzing Technical Goals and TradeoffsTechnical Goals Scalability Availability Network Performance Security Manageability Usability Adaptability and AffordabilityScalabilityScalability refers to how much growth a network design must supportoFor many enterprise network design customers scalability is a primary goaloThe network design you propose to a customer should be able to adapt to increase in network usage and scopePlanning for ExpansionYour customer should tell you how much the network will expand in the few yearsExpanding Access to DataIn the 1970s and 80s data was stored on mainframes In the 1980s and 90s data was stored on servers in departmental LANs and now they are stored on centralized mainframes and servers8020 80 of traffic stays locally and 20 of the traffic is destined for other departmentso8020 rule does not apply anymore because it is no longer universal and is rapidly moving to the other side of the scaleoCompanies are also implementing intranetsExtranet is used to describe an internal internetwork that is accessible by outside parties The business goal of making data available to more departments often results in the technical goal of using the mainframe as an incredibly powerful database serveroMaking the data available to many users allows people to use the same dataConstraints on ScalabilitySelecting technologies that can meet a customers scalability goals is a complex process with significant ramifications if not done correctlyoExample constructing a flat layer network with layer 2 switches can cause problems as number of users and user traffic increasesTop down network design is an iterative processScalability goals and solutions are revisited during many phases of the network design processAvailability Availability refer to the amount of time a network is available to users and is often a critical goal for network design customersoExpressed in uptime per year month day or houroHigher the availability of the network the higher the costoIf the network is up 165 hours in the 168 hours week availability is 9821 percentoIn general availability mean how much time the network is operationalReliability refer to a variety of issues including accuracy error rates stability and the amount of time between failuresAsynchronous Transfer Mode ATM has a connection admission control function that regulates the number of cells allowed into an ATM networkAvailability is also linked to redundancyoRedundancy is the solution to a goal of high availability and it means adding duplicate links or devices to a network to avoid downtimeIt ensures that business continuity after a major fault or disasterAvailability to associated with resiliencyoResiliency how much stress a network can handle and how quickly the network can rebound from problems including security breaches natural and unnatural disaster human error and catastrophic software or hardware failuresA network that has good resiliency has good availability
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