Computer Science Test 5 Nddc Scholarship

To abort a process means to stop a program or command prematurely. This is usually done when a user notices an error or if the system becomes unresponsive. For example, pressing 'Ctrl+C' in many command-line environments sends an abort signal to the running process.

A web page is a specific document or resource of information that is suitable for the World Wide Web and can be accessed through a web browser. While a 'web site' is a collection of related web pages, a 'web page' refers to an individual file within that collection.

Technically, email protocols allow a message to be sent without a subject line. However, it is not recommended as many spam filters flag 'no-subject' emails as suspicious, and it makes it difficult for the recipient to identify the purpose of the message before opening it.

Bandwidth measures the capacity of a communication link. In digital networks, it is typically expressed in bits per second (bps). A higher bandwidth indicates a greater capacity to move data, which results in faster download and upload speeds for the user.

The Internet is a 'network of networks.' While the World Wide Web (WWW) is a popular service used to access documents via a browser, the Internet itself is the underlying infrastructure that supports a wide range of services, including email, file transfers (FTP), and real-time communication.

Downloading software that is explicitly marked as 'freeware' or 'open source' is a legal and ethical activity. In contrast, using abusive language, disrupting private conversations, or distributing malicious code like viruses violates the principles of 'netiquette' and digital law.

Communication satellites act as relay stations in space. They receive signals from a ground station (uplink), amplify them, and retransmit them back to a different location on Earth (downlink). This technology is essential for global television broadcasting, long-distance telephony, and satellite internet services.

Dynamic IP addressing (via DHCP) allows an ISP to pull from a pool of addresses and assign one to a user for the duration of their session. Once the user disconnects, the address returns to the pool to be used by someone else. This is more efficient than static addressing, where an address is permanently reserved for one user even when they aren't using it.

Automated systems operate using either open-loop control (where the output has no effect on the control action) or closed-loop control. In a closed-loop system, 'feedback' is used to compare the actual output with the desired result and make adjustments automatically—like a thermostat adjusting a heater to reach a specific temperature.

A Modem (MOdulator-DEModulator) converts the digital data from a computer into analog signals that can travel over copper telephone wires. It also performs the reverse process for incoming signals. This was the primary method for home internet access before the widespread adoption of fiber and high-speed cable.