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18 Cards in this Set
- Front
- Back
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Why is performance management important? |
•Increased dependency of business on technology & cost when technology fails
•Maturity of IT and networking facilities •Service Level Management •Outsourcing and Outtasking •Quality of Service |
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What is QoS? |
Quality of Service = The idea that transmission rates, error rates, and other characteristics can be measured, improved, and, to some extent, guaranteed in advance. |
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What are some typical network design business goals? (11) |
•Increased revenue & profit •Improve corporate communication •Improve productivity •Build partnerships with other organizations •Expand into world-wide markets •Improve reliability •Modernize out-dated technologies •Reduce telecom and network costs •Expand data available to employees •Improve security •Offer better or new customer services |
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What are some brief constraint factors when trying to meet network design business goals? |
-Workplace -Politics -Budget -Time |
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What are some technical goals within network design? (8) |
•Scalability •Availability •Performance Security •Manageability •Usability •Adaptability •Affordability |
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What are two increasingly important things to consider alongside network design? |
Disaster Recovery and Risk Assessment |
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What needs to be considered when scaling? |
Routing protocols, addressing schemes, etc. |
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What are the availability requirements? |
-99.7% = 30 minutes downtime/week -99.95% = 5 minutes downtime/week |
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What is availability linked to? |
-Redundancy -Reliability -Resiliency -Recover ability |
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What is the availability formula? |
A = MTBF / (MTBF + MTTR) x 100 % MTBF = Mean time between failures MTTR = Mean time to repair (^^ Mean = Averages ^^) |
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What are the different keywords to network performance? |
•Utilization •Throughput •Accuracy •Response Time •Latency |
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What is utilization? |
The percentage of total available capacity (bandwidth) (usually measured in bps) in use. |
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What is optimum utilization? |
Maximum average utilization before network is considered saturated |
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What is the optimum utilization for Ethernet and WANs? |
Ethernet = < 50% due to shared media WANs = 70-80% (= sensible maximum) |
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What is throughput? |
Number of bits that the network is capable of accepting and delivering per unit of time (bps, Kbps, Mbps, Gbps, etc.). |
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What is goodput? |
The number of useful bits per unit of time forwarded by the network from a certain source address to a certain destination, excluding packet headers, re-transmitted packets, etc.
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What are different errors that could occur in networks in terms of transmission of data? |
-Alteration -Loss -Duplication -Out-of-order delivery of data |
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What are the metrics of errors? |
BER = Bit Error Rate PER/CER = Packet or Cell Error Rate PLR/CLR = Packet or Cell Loss Rate |
