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VPN (Virtual Private Network)
A connection that provides the functionality of a privately owned network while using the internet.
Compares the ID code or account number in transaction data with similar data in the master file to verify that the account exists.
"A digit computed from the other digits in a number (i.e. an ID number, or credit card number)"
"Sums a field that contains dollar values, such as the dollar amount of all sales for a batch of sales transactions."
"Sums a nonfinancial numeric field, such as the total of the quantity ordered field in a batch of sales transactions."
When the system displays a document with highlighted blank spaces and waits for the data to be entered.
Checks the accuracy of input data by using it to retrieve and display other related information.
"Contains the file name, expiration date, and other identification data at the beginning of a file."
Concurrent Update Controls
Protect records from errors that occur when two or more users attempt to update the same record simultaneously.
Verifying that there are the proper number of bits set to the value 1 in each character received.
When the sending and receiving systems perform the same check and compare to verify accuracy.
Enabling a system to continue functioning in the event that a particular component fails.
Uninterruptible Power Supply (UPS)
"Provides protection in the event of a prolonged power outage, using battery power to enable the system to operate lone enough to back up critical data and safely shut down."
Recovery Point Objective (RPO)
Represents the maximum length of time for which a company is wiling to risk the possible loss of transaction details.
Maintaining two copies of the database at two separate data centers at all times and updating both copies in real-time as each transaction occurs.
"A copy of a database, master file, or software that will be retained indefinitely as an historical record, usually to satisfy legal and regulatory requirements."
Recovery Time Objective (RTO)
Represents the time following a disaster by which the organization's information system must be available again.
"An empty building that is prewired for necessary telephone and internet access, plus a contract with one or more vendors to provide all necessary computer and other office equipment within a specified period of time."
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