Comms 3: Data Com PDF

COMMS 3: DATA COM Study online at https://quizlet.com/_evb9dr The quantities, characters, or symbols on which operations are performed by a computer, being stored and transmitted in the Data form o...

COMMS 3: DATA COM Study online at https://quizlet.com/_evb9dr The quantities, characters, or symbols on which operations are performed by a computer, being stored and transmitted in the Data form of electrical signals and recorded on magnetic, optical, or mechanical recording medi Process of transferring digital information between two or more Data communication points 1. Messsage 2. Sender What are the components of Data communication? 3. Receiver 4. Transmisssion line 5. Protocol Is the information to be communicated Message device that sends the data message. It can be a computer, work- sender sation, telephone, handset, video camera, and so on. device that receives the message receiver is the physical path by which a message travels from sender to a transmission medium receiver set of rules that govern the data communcation protocol refers to the form in whch data is stored, processed, and trans- Data representation mitted. is represented as a bit patter, a sequence of bits (0s or 1s). Different sets of bit patterns have been designated to represent Text text symbols. Also represented by bit patters. Hoever a code such as ASCII is not used to represent numbers. Is directly converted to a binary number number to simplify mathematical operations its simplest form, an image composed of matrix of pixels, where Images each pixel is a small dot. Refer to the recordinng or boradcasting of sound or music. It is Audio continuous, not discrete. Refers to the recodring or broadcasting of a picture or movie. Video Different sets of bit patters have designed to represent text sym- code bols, each set is called? The process of representing symbols is called? coding communication is unidirectional simplex each station can both transmit and receive but not at the same half-duplex time both stations can transmit and receive simultaneously full-duplex a set of services often referred to as nodes, connected by com- munication links. A node can be a computer, printer, or ay other Network device capable of sending/ or receving data generated by other nodes on the network. 1. Performance What are the three network criteria? 2. Reliability 3. Security It can be measured in many ways, including transit time and Performance response time. Is the amount of time required for a message to travell from one Transit time device to another Is the elapsed time between an inquiry and a response Response time measured by the frequency of failure, the time it takes a link to re- Reliability cover from a failure, and the networ's robustness in a catastrophe. 1/2  COMMS 3: DATA COM Study online at https://quizlet.com/_evb9dr issues include protecting data from unauthorized access, protect- ing data from damage and development, and implementing poli- security cies and procedures for recovery from reaches and data losses. provides a dedicated link between two devices point-to-point Also called multidrop, a connection is one in which more than two multipoint speficic devices shares a single link Refers to the way in which a network is laid out physically. Two or Physical topology more devices connect to a link; two or more links form a topology Types of network topology Bus, Ring, Star, Mesh, Tree, Hybrid One of the topology in which all the nodes are connected to a bus topology single cable The cable to which the nodes connect is called a backbone a network topology in which each node connects to exactly two other noes, forming a single continuous pathway for singals Ring topology through each node. a network topology in whch the infrastructure nodes connect di- rectly, dynamically and non-hierarchically to as many other nodes Mesh topolgy as possible and cooperate with one another integration of two or more different topolgies to form a resultant hybrid topolgy topology which has many advantages a hybrid network topology in which star networks are intercon- tree topology nected via bus networks. 1. Local area networks (LAN) Categories of Networks 2. Metropolitan Area network (MAN) 3. Wide area network (WAN) Is a computer network that interconnect computers within a limited local area network or LAN area applied to the interconnection of local area networks (LANs) in a Metropolitan Area Network or MAN city into a single larger network Is a network that exists over a large-scale geographical area and Wide area networks or WAN connects different smaller networks a global computer network providing a variety of information and communication facilities, consisting of interconnected networks Internet using standardized communication protocols. All nodes are individually connected to a central connection point Star topology 2/2