Textbook Notes (368,107)
Canada (161,650)
AFM 341 (30)
Brian Ma (12)
Chapter 12

AFM 341 Chapter 12: Chapter 12

5 Pages
Unlock Document

Accounting & Financial Management
AFM 341
Brian Ma

Chapter 12 Operating System (OS) - most important system software since it allows a computer to operate lol - Purpose o ensures integrity of system (translate high level languages to machine level languages? o control flow on multiprogramming and tasks of scheduling in computer o allocate computer resources to users and applications (provided controlled access to data?-->NOPE!) o manage interfaces of computer (What does that mean…?) - should be included as IT governance in coming up with policies and procedures (who can assess OS, resources – programs/files they can use, what they can do) Five fundamental control objectives of operating systems: 1. protect itself from users (user applications can’t gain control/damage OS) 2. protect users from each other (can’t access, destroy, corrupt data/programs of another user) 3. protect users from themselves (applications may have modules ?????- modules can’t destroy/corrupt another module) 4. protected from itself (OS is made up of modules – same as above) 5. protect from environment (power failure, etc. must be able to terminate activities to be recovered later) Database Systems - database: shared collection of related data that meets information needs of company - accountants need to understand database systems because they participate in designing internal control systems and improving business and IT processes - data warehouse: centralized collection of firm data stored for 5 to 10 years, useful for finding patterns and identifying trends - Operational databases: used for daily operations (only has data for the current year, updated when transactions happen) - data mining: process of searching for patterns in the data warehouse to make decisions (ex. predict customer buying behaviour) - data governance: handling data of a firm (data quality, data management, data policies, business process management, risk management) Local Area Networks - group of computers, printers, etc. connected to the same network over limited geographical range (ex. home office) - packet (small unit of data) is part of message/data set sent over networks - LAN devices = hubs, switches o hubs have multiple ports, when data arrives at one port is goes to other ones too! o switch provides path for each pair of connections on the switch by storing address info switching tables Wide area Networks (ex. Internet is the largest and widest) - link different sites, transmit info across geographically dispersed LANs, cover board geographic area - purpose o provide remote access to employees/customers o link two or more sites in a firm o provide corporate access to the internet - slower than LAN in transmitting information but offer guaranteed quality of service and security from point to point connection - uses routers and firewalls o router connects different LANs, software-based intelligent devices that examines IPs of sender and receiver to choose most efficient path in a network to communicate a message, can also divide and interconnect network segments/link two or more physically separate network segments o firewalls are a security system (hardware and software) that is built using routers, servers, and software; examines incoming and outgoing data packets to see if transmission should continue Virtual private network (VPN) - connects WANs by sending/getting encrypted packets - provides users with remote access to their firm’s network using the internet - cheaper than leased lines, but no guaranteed QoS - allow for dispersed productive workforce Wireless networks - comprised of access points + stations o access point: connects stations to a firm’s network o stations: wireless endpoint that has a wireless network interface card Security Objectives for Wired LANS and wireless LANs - confidentiality: only read by authorized party - integrity: intentional or unintentional changes to data in transmission - availability - access control Benefits of Wireless LANs Disadvantages to wireless LANs - mobility: online Attack radio link between station and access point or access, no cables to between two stations connect - eavesdropping (lurk and steal authentication info) - rapid deployment: - man-in-the middle (actively intercepts authentication time saved info between wireless clients and access points implementing networks since no - masquerading (pretend to be authorized user to gain physical cables access) - message modification (alters legitimate message) - message replay (retransmits the messages like they are the user) - misappropriation (steals or uses service even tho not authorized) - traffic analysis (lurk to identify communication patterns and users) - rogue access points (set up unsecure wireless network in same area with same name and intercepts messages)
More Less

Related notes for AFM 341

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.