Data and Computer Communication Lecture 1 Summary

The fundamental problem of communication is reproducing a message selected at one point at another point, either exactly or approximately.

The three main focus areas are Data Communications, Computer Networks, and Distributed Systems.

Data communications refer to the exchange of data between two devices through a transmission medium like a wire cable.

<p>The Physical Structure and Data Representation are components of the Data Communication model.</p> Signup and view all the answers

<p>The driving forces for the evolution of Data Communication include Traffic Growth and Protocols/Standards.</p> Signup and view all the answers

<p>bit pattern, ASCII, Extended ASCII, Unicode, ISO</p> Signup and view all the answers

<ol> <li>Input information 2. Input data 3. Transmitted signal 4. Received signal 5. Output data 6. Output information</li> </ol> Signup and view all the answers

<p>Traffic Growth, Technology Trends, Everything over IP</p> Signup and view all the answers

<p>Around 120 kbps</p> Signup and view all the answers

<p>Faster and cheaper computing and communication, Optical fiber and high-speed wireless, Intelligent networks, Quality of service (QoS), Cloud computing</p> Signup and view all the answers

<p>A set of autonomous computers interconnected by a single technology</p> Signup and view all the answers

<p>The key elements of a protocol are: Syntax (structure or format of data), Semantics (meaning of each section of bits and what action to be taken), and Timing (when data should be sent and how fast they can be sent).</p> Signup and view all the answers

<p>A human protocol is an agreement between communication parties on how communication will proceed, while a computer network protocol defines the rules and formats that devices must follow to transmit data over a network. The examples given are a human protocol of greeting someone with &quot;Hi&quot; and waiting for a response, and a computer network protocol of a TCP connection request and response.</p> Signup and view all the answers

<p>Standards are essential in creating and maintaining an open and competitive market for equipment manufacturers and in guaranteeing national and international interoperability of data and telecommunications technology and processes.</p> Signup and view all the answers

<p>The key organizations involved in the development of Internet standards are the IETF (Internet Engineering Task Force) and the IEEE 802 LAN/MAN Standards Committee.</p> Signup and view all the answers

<p>The diagram shows that a Local Area Network (LAN) is connected to a Wide Area Network (WAN) through a router. The router acts as an intermediary, allowing the LAN to communicate with the WAN. This interconnection of different networks through routers is a fundamental aspect of the Internet, which is described as a 'network of networks'.</p> Signup and view all the answers

<p>The URL &quot;<a href="http://www.awl.com/kurose-ross">http://www.awl.com/kurose-ross</a>&quot; likely refers to a resource (e.g., a website) related to the Kurose-Ross textbook, which is a common reference in the field of computer networks and communications.</p> Signup and view all the answers

<p>A fully connected mesh topology is a network topology where every node is directly connected to every other node. This provides redundancy and fault tolerance, as data can take multiple paths. It would be suitable for mission-critical applications like air traffic control or financial trading systems where reliability is paramount.</p> Signup and view all the answers

<p>LANs cover small areas like a building or campus and are used to interconnect personal devices and resources. MANs span a city or town, interconnecting LANs and providing internet access. WANs cover vast geographic areas like countries or continents, linking smaller networks across long distances.</p> Signup and view all the answers

<p>Protocols are sets of rules that govern data communication in networks, ensuring compatibility between devices from different vendors. For example, the TCP/IP protocol suite defines standards for internetworking, with protocols like IP for addressing and routing, and TCP for reliable data transfer.</p> Signup and view all the answers

<p>Networks allow multiple users to access shared logical resources like databases, file servers, and applications, as well as physical resources like printers, storage devices, and specialized hardware like 3D printers or scientific instruments. This enables efficient utilization of expensive resources.</p> Signup and view all the answers

<p>Networks enable computers to interface with the physical world through sensors and actuators. Sensor data like webcam feeds, location tracking, and environmental monitoring is gathered over networks. Networks also control physical systems like door locks, manufacturing equipment, and autonomous vehicles.</p> Signup and view all the answers

<p>A PAN is a computer network that interconnects devices within a very small area, typically within a 10-meter radius of a person. PANs are useful for interconnecting wearable devices, smartphones, and personal computing devices without the need for a larger local or wide area network infrastructure.</p> Signup and view all the answers