NDSU MIS 376 Chapter 3 Questions and Answers Graded A+
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NDSU
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NDSU
NDSU MIS 376 Chapter 3 Questions and Answers Graded A+
What are QoS metric? (do not just spell out the acronym)
(quality of services) That is quantitative measures of network performance that define what "working well" means and measure how well the network is providing its services.
Why a...
NDSU MIS 376 Chapter 3 Questions and
Answers Graded A+
What are QoS metric? (do not just spell out the acronym) - answer (quality of
services) That is quantitative measures of network performance that define what
"working well" means and measure how well the network is providing its services.
Why are QoS metric important? - answer a. These metrics track the service quality
that users receive.
Distinguish between rated speed and throughput. - answer a. The rated speed is the
speed the standard or the carrier specifies
b. The throughput is the speed you actually receive (usually is slower)
Distinguish between individual and aggregate throughput. - answer a. Aggregate
throughput is the throughput available to all users
b. The individual throughput is the aggregate throughput divided by the number of active
users at the moment.
You are working at an access point with 20 other people. Three are doing a download at
the same time you are. The rest are looking at their screens or sipping coffee. The
access point you share has a rated speed of 150 mbps and provides a throughput of
100 mbps. How much speed can you expect on average for a download? - answer
25mbps (4 people)
In a coffee shop, there are 10 people sharing an access point with a rate seed of 2
Gbps. The throughput is half the rated speed. Several people are downloading. Each is
getting an average of 100 mbps. How many people are using the internet at that
moment? - answer 10 people
If 100 conversations averaging 50 mbps are multiplexed on a transmission line, will the
required transmission line capacity be less than 5 gbps, equal to 5 gbps, or more than 5
gbps? - answer Less than 5 Gbps
What is the business benefit of multiplexing? - answer Cost savings
What is availability? - answer Is the percentage of time that the network is available
for use. (%)
When should you measure error rates? Why? - answer a. Companies must measure
error rates when traffic levels are high to have a good understanding to error rate risk
, What is latency? - answer a. The amount of network delay (example is when you are
talking on the phone and you keep interrupting each other because there is latency, you
want low latency)
In what units is latency measured? (skipped this one) - answer Milliseconds
What is Jitter? - answer a. Is the average variability in arrival times (latency)
b. Variation of latency
Why may adding applications that cannot tolerate latency and jitter be expensive? -
answer a. Because they may have to include forklift upgrades for many of its
switches and routers.
What are service level agreements (SLA)? - answer a. Are contracts that guarantee
levels of performance for various metric such as speed and availability
Does a service level agreements (SLA) measure the best case or the worst case? -
answer a. Worst case
Would an SLA specify a highest speed or a lowest speed? - answer a. Lowest
Would an SLA specify a highest availability or a lowest availability? - answer a.
Lowest
Would an SLA specify the highest latency or lowest latency? - answer a. Highest
Would an SLA guarantee specify a highest jitter or a lowest jitter? - answer a.
Highest
What happens if a carrier does not meet its SLA guarantee? - answer a. Pay a
penalty on the server provider
If carrier speed falls below its guaranteed speed in an SLA, under what circumstance
will the carrier not have to pay a penalty to the customers? - answer a. If it only falls
below the speed for a little bit
Does residential ISP service usually offer SLA guarantees? Why or why not? - answer
a. No, this keeps the price of residential services down, but there will be more instances
of less-than-advertised performance.
A business has an internet access line with a maximum of speed 100 mbps. What two
things are wrong with this SLA? - answer a. Don't want max speed, you want min
b. And it doesn't have a length of time
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