Computer Basics and Network Security

RAM is volatile memory, meaning it requires electrical power to maintain its data. When you turn a computer off, everything stored in the RAM is lost, while data in non-volatile memory like ROM remains intact.

A petabyte is a unit of digital information storage equal to 10 to the 15th power bytes, which is written as 1 followed by 15 zeros. This is equivalent to 1,000 terabytes or 1 million gigabytes.

Data transmitted over computer networks is broken down into small blocks called packets. These packets travel independently across the network and are reassembled into the original data once they reach their destination.

In digital information storage, a megabyte is approximately equal to 1 million bytes (specifically 1,048,576 bytes, or 1000^2 in decimal contexts).

Each 8-bit binary number represents an ASCII character code. Converting 01101000, 01100101, 01101100, 01101100, and 01101111 to decimal gives 104, 101, 108, 108, and 111. In ASCII, these numbers correspond to the letters h, e, l, l, and o, spelling out 'hello'.

ROM stands for Read-Only Memory, which is non-volatile storage used to store the computer's startup instructions (BIOS). Unlike RAM, the data stored in ROM cannot be easily modified or written to. The other options are simply made-up phrases.

RAM stands for Random Access Memory, which serves as the computer's primary volatile workspace. It temporarily holds data and programs currently in use by the CPU so they can be accessed quickly. Unlike ROM, RAM is volatile and loses its contents when the computer is powered off.

SQL stands for Structured Query Language, which is the standard programming language used to manage and manipulate relational databases. It allows users to perform tasks such as querying, updating, and inserting data. The other options use incorrect words like 'question' instead of 'query'.

Bus, star, and ring are all standard network topologies used to describe how devices are arranged and connected in a network. A square is a geometric shape and is not a recognized network topology. Therefore, square is the correct choice as it is not a topology.

An algorithm is best defined as a step-by-step procedure or set of rules designed to solve a specific problem or perform a computation. While it is a set of instructions, the key aspect of an algorithm is its structured, goal-oriented nature to solve problems. Simply calling it a collection of steps is too vague.

Merge, Bubble, and Insertion are all well-known sorting algorithms used to arrange data in a specific order. Binary, in this context, refers to Binary Search, which is a searching algorithm rather than a sorting algorithm. Therefore, Binary is the odd one out.

A virus, a DoS (Denial of Service) attack, and phishing are all well-known and common network threats. Since all three options listed are indeed network threats, 'None of the above' is the correct choice. Each of these poses a significant risk to network security and data integrity.

A brute force attack is a trial-and-error method where an attacker uses automated software to guess passwords or PINs repeatedly until the correct one is found. It relies on sheer computational power to break through security rather than exploiting system vulnerabilities. Physical violence is not what this technical term refers to.

A Denial of Service (DoS) attack works by flooding a targeted machine or network with superfluous requests in order to overload systems and prevent legitimate users from accessing services. Phishing and using trusted brands to steal info are forms of social engineering, not DoS attacks. Sharing details is a user behavior rather than an external cyberattack.

According to global cybersecurity reports from 2015, approximately one-third (1/3) of all computers and devices worldwide were affected by some form of malware. This high fraction highlights the widespread nature of digital security threats during that period. The other options represent incorrect proportions.

Malware is a broad term that stands for malicious software and encompasses many different types of threats. Worms, viruses, and rootkits are all specific categories of malware designed to infect, damage, or gain unauthorized access to systems. Therefore, all of the listed options are involved in malware.

The term malware is a portmanteau, which is a blend of the words 'malicious' and 'software'. It refers to any software specifically designed to disrupt, damage, or gain unauthorized access to a computer system. The other options are incorrect word combinations.