Week2 Itm130 Essay

5126 words - 21 pages


1. Why is a focus on information systems insufficient in networking?

Because the network professionals often has to focus on the broader business system in which the information system is embedded.

2. Compare trends in network demand and network budgets.

The network demand is likely to grow rapidly in the future, just as it has always done in the past. The network budgets are growing very slow

3. What are QoS metrics? (Do not just spell out the acronym.)

QoS metrics stands for quality-of-service metrics that is metrics that is quantitative measures of network performance. For instance, companies use QoS metric to quantify their quality of service so ...view middle of the document...

b. What is downtime?

The percentage of the time that the network is not available

c. What are the “five nines”?

The availability target is 99.999%. Data networks generally have lower availability but are under pressure to improve their availability given the cost of network downtime to firms today.

d. What are packets?

Host send data in small messages called packets.

e. When should error rates be measured? Why?

Error rates should be measured when network is overload, error rates can soar because the network has to drop the packet it cannot handle.

f. What is latency?

Latency is the amount of delay measured in milliseconds.

g. In what units is latency measured?

Measured in milliseconds

h. What is jitter?

Jitter occurs when the latency between successive packets varies.

i. For what applications is jitter a problem?

Make voice sound jittery.


a. What are service level agreements?

Contracts that guarantee levels of performance for various metrics such as speed and availability. If a service does not meet the SLA guarantees, the service must pay a penalty to its customer.

b. Does an SLA measure the best case or the worst case?

Yes. Service will be no worse than a specific number.

8. Do a three-site traffic analysis. Site X attaches to Site Y, which attaches to Site Z. Site X is 130 meters east of Site Y. Site Z is 180 meters west of Site Y. Site X needs to be able to communicate with Site Y at 3 Gbps. Site Y needs to be able to communicate with Site Z at 1 Gbps. Site X needs to be able to communicate with Site Z at 700 Mbps. Supply your picture giving the analysis. You may want to do this in Office Visio or Windows Draw and then paste it into your homework. (Tip. Check page 151)

a. What traffic capacity will you need between Sites X and Y?

(700Mbps + 3Gbps) = 462.5 Mbps

b. Between Y and Z?

(700Mbps + 1Gbps) =212.5Mbps

9. What is the purpose of redundancy in transmission lines?

To provide backup paths in case another line fails.

a. If the line between R and S fails in Figure 4-11, how much capacity will the line between Q and S need?

(300Mbps + 2Gbps) = 287.5Mbps

b. What about the line between Q and R?

(300Mbps + 2.04500Gbps) = 293.125000 Mbps


a. What is a network topology?

Refers to the physical arrangement of network’s computers, switches, routers, and transmission line.

b. At what layer do we find topologies?

Physical layer concept


a. What is the advantage of a full-mesh leased line network?

Provides direct connections between every pair of sites. It provides many redundant paths so that if one site or leased line fails, communication can continue unimpeded.

b. What is the disadvantage?


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