EIU CIS 3200 - CIS 3200 NETWORK MANAGEMENT I (9 pages)

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CIS 3200 NETWORK MANAGEMENT I



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CIS 3200 NETWORK MANAGEMENT I

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Lecture Notes


Pages:
9
School:
Eastern Illinois University
Course:
Cis 3200 - Networking Fundamentals
Networking Fundamentals Documents

Unformatted text preview:

School of Business Eastern Illinois University Network Management 1 Week 15 Friday 4 21 2006 Week 16 Monday 4 24 2006 Abdou Illia Spring 2006 Learning Objectives Generating Useful Statistics 2 Availability Reliability Centralized Network Management Generating Useful Statistics Statistics Data about network operation or network devices operation Example Availability of a modem Reliability of a Hub transmission speed etc Statistics are very helpful for network management 3 Could help identifying problems in Network operation Could be used to demonstrate the need to invest in technology Q What kind of tools already introduced in class can be used to generate useful statistics 1 4 Availability Availability probability that a particular component or system will be available during a fixed time period Availability is function of Mean time between failures Given by manufacturer or generated based on past performance Mean time to repair Found in studies or in our archives Mean time between failures MTBF is the average time a device or system will operate before it fails Mean time to repair MTTR is the average time necessary to repair a failure 5 Availability Standard equation A t a a b b a b x e a b t in which a 1 MTTR b 1 MTBF e natural log function t the time interval Approximation equation Availability Total available time Downtime Total available time Availability A t a a b b a b x e a b t 6 Suppose we want to calculate the availability of a modem that has a MTBF of 3000 hours and a MTTR of 1 hour The availability of this modem for an 8 hour period is a 1 1 b 1 3000 0 00033 A 8 hours 1 1 0 00033 0 00033 1 0 00033 x e 1 0 00033 8 0 9997 0 00033 x 0 000335 0 9997 Q What will be the availability of the modem if the Approximation equation is used 2 Availability A component has been operating continuously for three months During that time it has failed twice resulting in downtime of 4 5 hours Calculate the availability of the component during that threemonth period using the



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