Q: You receive Internet service either at home or on your phone through an Inter

Question

Q: You receive Internet service either at home or on your phone through an Internet Service Provider (ISP). You get to create SLAs that your ISP must follow. Being reasonable, write SLA statements you would like to have for the following performance metrics: a) an SLA statement for speed, b) an SLA statement for availability, c) an SLA statement for latency, and d) an SLA statement for jitter. Your statements should include both the worst-case performance metrics (in numbers) and a percentage-of-time element, if applicable Q: A company has offices in Los Angeles, Las Vegas, Cleveland, and Boston. There are physical transmission links between Los Angeles and Las Vegas, Las Vegas and Cleveland, and Cleveland and Boston. Los Angeles needs to communicate at 400 Mbps with each of the three other sites. Las Vegas and Boston only need to communicate with one another at 150 Mbps. Cleveland and Bostorn need to communicate with one another at 2 Gbps. Cleveland and Las Vegas need to communicate with one another at 250 Mbps. How much traffic will each transmission link have to carry? Show your work, and display your results in a table as shown below: Transmission Link Total Transmission Rate Required Between Los Angeles and Las Vegas Between Las Vegas and Cleveland Between Cleveland and Boston

Explanation / Answer

a) 1.Internet Business Edition

2.High speed Internet Business Edition

3.Fast access@Business DSL

b) The availability of connection can potentially be shared amongst other PCs in your home. ADSL, cable modem, satellite and wireless services do generally cost more to set up.

ISDN

DSL

ADSL Modem

Cable

c) Modern dial-up modems typically have a maximum theoretical transfer speed of 56 kbit/s (using the V.90 or V.92 protocol), although in most cases, 40–50 kbit/s is the norm. Factors such as phone line noise as well as the quality of the modem itself play a large part in determining connection speeds.

Dial-up connections usually have latency as high as 150 ms or even more; this is longer than for many forms of broadband, such as cable or DSL, but typically less than satellite connections. Longer latency can make video conferencing and online gaming difficult, if not impossible. An increasing amount of Internet content such as streaming media will not work at dial-up speeds.

d) Jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal.Three commonly used metrices of jitter are : Absolute,periodic,cyclic.

Question 2 : Physical transmission link

Link roundtrip time = 2 × packet transmission time + 2 × propagation delay + processing delay

Los Angeles need 400 Mbps

Los Vegas -> Boston 150 Mbps

Cleveland->Boston 2 Gbps

Cleveland-> Las vegas 250 Mbps

Transmission time between Los Angeles and Las Vegas = 2 × packet transmission time + 2 × propagation delay + processing delay

=2 × 400 + 2 × 0 + 0

=800Mbps

b) Transmission time between Los Vegas and Cleveland = 2 × packet transmission time + 2 × propagation delay + processing delay

= 2 × 150 + 2 × 2 +0

=300+4

=304mbps

c) Transmission time between Cleveland and Las Vegas = 2 × packet transmission time + 2 × propagation delay + processing delay

= 2 × 2 + 2 × 0

=6 gbps

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