Many pieces of equipment or software come with built-in security features. "Vendor default security settings" means the 'out of the box' settings that these security features come with. For example, system administration or service accounts will ship from the manufacturer with a 'default password'. These default accounts and passwords are published and well known, and
System login account predefined in a manufactured system to permit initial access when the system is first put into service.
The practice of removing data segments. Commonly, when account numbers are truncated, the first 12 digits are deleted, leaving only the last 4 digits.
Communications: sending information over a network.
Information flowing between computers over a network. Traffic can be carrying email, files, web-pages, phone-conversations, or a wide variety of other things.
A non-member organization that performs transaction authorization and processing, account record keeping, and other day-to-day business and administrative functions for issuers and merchant banks.
A recorded time, showing when a particular thing happened. These are used in audit records and in trouble-shooting computer problems.
Systems that are not used for 'real work', but for testing solutions or programs. The idea is that if something goes wrong, the systems that are used for real work are not damaged or interfered with.
Making sure that various clocks are all showing the exact same time. Having synchronized clocks makes record-keeping and trouble-shooting simpler and more reliable.
Hardware or software that connects two or more networks, and allows computers to talk to each other.