Page 2 Data communications (Datacom) is the engineering Datacom) discipline concerned with the communication between devices. A network is a set of devices (often referred to as nodes) nodes) connected by communication links. links. A computer network is any set of computers or devices connected to each other via some form of transmission medium with the ability to exchange data. Here information is presented in a form which is agreed upon by the parties creating and using the data. A computer
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Table of Contents Part 1: General review of data link layer 2 a) Explain the working principles of the data link layer. 2 b) Is controlled access better than contention for media access control? Discuss. 2 c) Why is error detection important in this layer? What is being measured? 3 d) Identify three significant noises that can cause errors in data communication digital circuits. Briefly explain. 3 Part 2: General review of error correction 4 a) Why is cyclical redundancy
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* Set of techniques that allows the simultaneous transmission of multiple signals across a single link * allows several transmission sources to share a larger transmission capacity Link = physical path Channel = portion of a link that carries a transmission between a given pairs of lines 2 CATEGORY OF MULTIPLEXING WDM FDM TDM ADSL Frequency Division Multiplexing * FDM – numerous signals are combined for transmission on a single communications line or channel. Each
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from my host and “iperf3 -c <remote_host_running_server> -u -l <size> -n <size>” is used to send UDP datagram with given payload size to remote host while the remote host uses “iperf3 -s” to exexute an iperf3 server. 1472 bytes is the maximum value of data for a UDP datagram which is sent without fragmentation. This is observed from the tcpdump output for a fragment of 1473 bytes. We see that two fragments are being made. The first fragment is of 1480 bytes with an offset of 0 bytes and the second fragment
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Com EENG 33151 – DATA COMMUNICATION AND COMPUTER NETWORKS ASSIGNMENT 1 (CO1‚ CO2 : PO1‚PO3) Note: • Submission Date: On or before but not after 12-10-2012 • Refer “Data Communications and Networking” 4th edition‚ Behrouz A. Forouzan • No Plagiarism • Kindly use A4 sheets 1. For n devices in a network‚ what is the number of cable links required for a mesh‚ ring‚ bus‚ and star topology? 2. Assume five devices are arranged in a mesh topology
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best to show why Data Link Control was established. In the early 1970 ’s‚ the U.S. Defense Advanced Research Projects Agency (DARPA) started a research program interlinking computer to share information. While sending information from one site to the other many problems arose with losing data (Society). To decrease the amount of corrupted data being transmitted‚ protocols were established. These protocols were a drawn out process that was very slow but was able to transfer data all across the world
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Vehicle Design Transmissions Part 1 Dr. Alasdair Cairns Content • Transmission fundamentals – Principles of gears (revision) – Road load losses • Gear ratio optimisation – Performance – Fuel economy Transmissions – Overview Why do we need a gearbox in a road car? Transmissions – Practical Use Seven practical reasons why a gearbox is required: 1. To increase tractive effort when the vehicle is moved from rest 2. To improve hill climbing or descending ability
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Which of the following is a data link layer function? A) packetizing B) error and flow control C) medium access control The data link layer is responsible for _______ delivery. C) hop-to-hop The data packet at the data link layer is usually called a _______. A) frame The protocol for obtaining the physical address of a node when the IP address is known is called _______. C) ARP A signal can lose energy due to the resistance of the medium. This is called _______. D) attenuation
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| | WRET3105 NETWORK AND DATA COMMUNICATION Assignment 4 Semester 1‚ session 2011/2012 Submitted by: Student | : | Nadiah binti Zainudin | Student No. | : | WET080011 | Instructor | : | Saeid Abolfazli | Date | : | 2nd Nov 2011 | ------------------------------------------------- Questions: 1. What is QoS? Why QoS is important and how QoS is measured? 2. What is management of QoS? ------------------------------------------------- -------------------------------------------------
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Transmission Media • Transmission medium – Physical path between transmitter and receiver – May be guided (wired) or unguided (wireless) – Communication achieved by using em waves • Characteristics and quality of data transmission – Dependent on characteristics of medium and signal – Guided medium ∗ Medium is more important in setting transmission parameters – Unguided medium ∗ Bandwidth of the signal produced by transmitting antenna is important in setting transmission parameters ∗ Signal directionality
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