relationship between service and protocol
1, What is a service and what is a protocol in layered computer networks? What is the
relationship between service and protocol?
2, The performance of a client-server system is strongly influenced by two major network
characteristics: the bandwidth of the network (that is, how many bits/sec it can transport)
and the latency (a.k.a delay, that is, how many seconds it takes for the first bit to get from
the client to the server). Does a high bandwidth surely lead to low latency? If yes, why?
If not, give an example of a network that exhibits high bandwidth but also high latency
and an example of one that has both low bandwidth and low latency. Discuss now what
determines the latency and what does the bandwidth.
3, LAN is a broadcast network in that the information sent by a node can be heard by all
nodes in the same LAN. A disadvantage of a broadcast subnet is the capacity wasted
when multiple hosts attempt to access the channel at the same time. As a simplistic
example, suppose that time is divided into discrete slots, with each of the n hosts
attempting to use the channel with probability p during each slot. What fraction of the
slots will be wasted due to collisions?
4, A system has an n-layer protocol hierarchy. Applications generate messages of length
M bytes. At each of the layers, an h-byte header is added. What fraction of the network
bandwidth is filled with headers?
5, When a file is transferred between two computers, two acknowledgement strategies are
possible. In the first one, the file is chopped up into packets, which are individually
acknowledged by the receiver, but the file transfer as a whole is not acknowledged. In the
second one, the packets are not acknowledged individually, but the entire file is
acknowledged when it arrives. Discuss the good and bad sides of these two approaches.
6, How long is a bit in meters? Use a transmission speed of 10 Mbps and assume the
propagation speed in coax is 2/3 the speed of light in vacuum.
7. An image is 1600 × 1200 pixels with 3 bytes/pixel. Assume the image is
uncompressed. How long does it take to transmit it over a 56-kbps modem channel? Over
a 1-Mbps cable modem? Over a 10-Mbps Ethernet? Over 100-Mbps Ethernet? Over
8, Suppose the algorithms used to implement the operations at layer k is changed. How
does this impact operations at layers k – 1 and k + 1? Suppose there is a change in the
ORDER THIS ESSAY HERE NOW AND GET A DISCOUNT !!!
Our Service Charter
Excellent Quality / 100% Plagiarism-FreeWe employ a number of measures to ensure top quality essays. The papers go through a system of quality control prior to delivery. We run plagiarism checks on each paper to ensure that they will be 100% plagiarism-free. So, only clean copies hit customers’ emails. We also never resell the papers completed by our writers. So, once it is checked using a plagiarism checker, the paper will be unique. Speaking of the academic writing standards, we will stick to the assignment brief given by the customer and assign the perfect writer. By saying “the perfect writer” we mean the one having an academic degree in the customer’s study field and positive feedback from other customers.
Free RevisionsWe keep the quality bar of all papers high. But in case you need some extra brilliance to the paper, here’s what to do. First of all, you can choose a top writer. It means that we will assign an expert with a degree in your subject. And secondly, you can rely on our editing services. Our editors will revise your papers, checking whether or not they comply with high standards of academic writing. In addition, editing entails adjusting content if it’s off the topic, adding more sources, refining the language style, and making sure the referencing style is followed.
Confidentiality / 100% No DisclosureWe make sure that clients’ personal data remains confidential and is not exploited for any purposes beyond those related to our services. We only ask you to provide us with the information that is required to produce the paper according to your writing needs. Please note that the payment info is protected as well. Feel free to refer to the support team for more information about our payment methods. The fact that you used our service is kept secret due to the advanced security standards. So, you can be sure that no one will find out that you got a paper from our writing service.
Money Back GuaranteeIf the writer doesn’t address all the questions on your assignment brief or the delivered paper appears to be off the topic, you can ask for a refund. Or, if it is applicable, you can opt in for free revision within 14-30 days, depending on your paper’s length. The revision or refund request should be sent within 14 days after delivery. The customer gets 100% money-back in case they haven't downloaded the paper. All approved refunds will be returned to the customer’s credit card or Bonus Balance in a form of store credit. Take a note that we will send an extra compensation if the customers goes with a store credit.
24/7 Customer SupportWe have a support team working 24/7 ready to give your issue concerning the order their immediate attention. If you have any questions about the ordering process, communication with the writer, payment options, feel free to join live chat. Be sure to get a fast response. They can also give you the exact price quote, taking into account the timing, desired academic level of the paper, and the number of pages.