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Chapter 6, 9, 10, 11

Broadband communications telecommunications system that can exchange data very quickly
telecommunications process 1: sending equipment 2: signal 3: telecommunications device 4: medium 5: telecommunications device 6: receiving equipment
Communications protocol set of rules that governs the exchange of information over a communications channel
Circuit switching network / Packet switching network Creates a path that is committed for the duration of the communication. Traditional telephone network. / No fixed path. Data is broken into packets that transmit individually and can take various paths from sender to recipient. IP.
VPN Virtual Private Network uses the internet to connect multiple remote locations. Electronic Funds Transfer, ACH payments, Wire Transfers.
Switch Bridge Router Gateway physical device address to another device on same network. connects local area networks by using the same telecommunications protocol. Device that routes data packets across two or more networks. Device that serves as an entrance to another network.
Approaches to securing the transmission of confidential information WEP- Wired equivalent privacy WPA- Wi-Fi protected access DES- Data encryption standard AES- Advanced encryption standard
Client/server computing Saves on hardware and software support cost, minimizes traffic on the network, and security mechanisms are implemented directly. 2-5 year conversion process, difficult to control the environment, and leads to multi-vendor environment.
Microwave and Satellite Transmission line of sight; the straight line between the transmitter and receiver must be unobstructed. Microwave station in outer space.
Basic communications channel characteristics Simplex: doorbell Half-duplex: can transmit one at a time Full-duplex: same time
Bandwidth determines information-carrying capacity. The more bandwidth the more info can be exchanged at one time.
Guided Telecommunications Media Twisted pair wire- telephone service, speed and distance limitations. Coaxial cable- cleaner and faster, more expensive. Fiber-optic cable- high transmissions rates, expensive. Broadband over power lines- only internet, expensive and can interfere.
Telecommunications Medium Material that carries an electronic signal and serves as an interface between sending and receiving devices.
Computer Network communications media, devices, and software needed to connect two or more computer systems and/or devices.
Processing Strategies Centralized- single location. Decentralized- various remote locations. Distributed- remote locations but connected via a network.
File server systems file server sends user entire file. User can manipulate.
Benefits of Networks Shared resources, data, programs, i/o devices, mass storage devices, CPU services.
Categories of Networks Peer to peer. Client/server.
Methods of securing data transmission Encryption. Virtual Private Network (VPN)
Enterprise System supports running and management of a business.
Special Information Systems MIS/DSS TPS Data up to> info. Routine, decision support, input and output, complexity of analysis. TPS>MLML. Special Info>LMLM.
Objectives of a TPS Capture, process, update database. Accurate and complete. avoid fraud. timely responses and reports. reduce labor. improve customer service. competitive advantage.
Transaction processing methods and objectives Batch processing- payroll. Online transaction processing (OLTP)- ATM, timekeeping.
Transaction Processing Cycle Data Collection. Editing. Correction. Manipulation. Storage. Document production and reports.
ERP Enterprise Resource Planning- access to data, cost elimination, upgrade of technology. Expense and time, difficult change, risks in using one vendor.
Financial and Managerial Accounting and ERP Financial- use recorded financial transactions for decision making. Managerial- assess the profit.
Hosted Software Model for Enterprise Software Cloud concept & decrease total cost, faster, lower risk. Availability and reliability issues, data security issues, savings may be offset by vendors.
International Issues Different languages and cultures, varying laws and customs, multiple currencies.
TPS Audit prevents accounting irregularities and/or loss of data privacy. Meets the business need? What procedures and controls have been established? Being used properly? Accurate and honest?
Audit Trail Documentation that allows the auditor to trace any output from the computer system back to the source documents.
Decision Making Intelligence- identify and define potential problems or opportunities. Design- Develop alternative solutions to the problem. Choice- Select a course of action.
Problem Solving Implementation- put a solution into effect. Monitoring- Evaluate the implementation for effectiveness.
Programmed Decision Made using a rule, procedure, or quantitative method.
Created by: kirstieallie