Technology Questions and Answers

Answer: C

Full duplex allows both devices to transmit and receive at the same time.

A telephone is full duplex. Half duplex allows both directions but only one at a time, as with a walkie-talkie, and simplex only one direction at all, as in broadcasting.

Answer: D

Computer security is increased by passwords, firewalls and antivirus software together.

Each addresses a different threat: passwords control who gets in, the firewall controls what traffic reaches the machine, and antivirus software catches malicious code that arrives another way.

Answer: A

Cache is the fastest memory.

It sits between the processor and main memory, holding recently used data, and is built of static RAM on the processor die itself. Access takes a few clock cycles against tens or hundreds for main memory.

Answer: A

It is not true that data stays permanently written in RAM.

RAM is volatile: its contents vanish the moment power is removed. The other statements hold - it can be read and written, accessed randomly, and retains data while the computer is on.

Answer: D

FTP stands for File Transfer Protocol.

It is one of the oldest internet protocols, defined in 1971, and uses two connections - one for commands and one for the data itself. It sends credentials in plain text, so SFTP and FTPS have largely replaced it.

Answer: D

SQL is related to databases.

Structured Query Language is the standard means of defining, querying and updating a relational database. It is declarative: you state what data you want rather than how to fetch it.

Answer: D

A compiler belongs to programming languages.

It translates source code written in a high-level language into machine code, checking the syntax and optimising as it goes, and produces an executable that runs without the compiler present.

Answer: D

Modem bus is not a bus in a computer system.

The three buses are the address bus, carrying the location; the data bus, carrying the contents; and the control bus, carrying the timing and read/write signals.

Answer: B

Red Hat Linux is an operating system.

It is a distribution of Linux aimed at enterprise use, packaging the kernel with GNU tools, a package manager and long-term support. Red Hat's business model is selling support rather than the software itself.

Answer: B

The NOT gate is also called an inverter.

It has one input and one output and simply reverses the value: 0 becomes 1 and 1 becomes 0. With AND and OR it forms a functionally complete set from which any logic circuit can be built.