In intrusion detection systems, a 'Signature' is a set of rules used to detect typical intrusive activity. These rules help identify known patterns of attacks or breaches.

The 'DHCP (Dynamic Host Configuration Protocol)' is used to automatically assign IP addresses to devices on a network. It simplifies network management by dynamically allocating IPs to devices.

The primary function of the ALU (Arithmetic Logic Unit) is to 'execute instructions.' It performs arithmetic operations (addition, subtraction, etc.) and logical operations (AND, OR, etc.) as directed by the CPU.

The primary metric used in BGP for path selection is the 'AS Path Length.' BGP routers use this information to determine the best path to a destination network based on the number of Autonomous Systems (ASes) through which the route has traversed.

A "risk matrix" helps in 'prioritizing risks.' It categorizes risks based on their likelihood and impact, allowing organizations to focus their resources on mitigating the most critical risks first.

A 'Logic Bomb' is a type of malware that is programmed to execute malicious actions when a predefined condition is met, such as a specific time or event. It can cause harm or data loss.

Bluetooth Low Energy (LE) is optimized for low power usage and short-range communications, making it ideal for wearable devices, IoT, and other applications where power efficiency is crucial.

The method where certain portions of a dataset are intentionally left out of training to validate the model's performance is called "Cross-Validation." Cross-validation helps assess a model's generalization and performance on unseen data.

In NLP, 'Polysemy' refers to a situation where a word has multiple meanings, and the meaning depends on the context. This is a significant challenge in natural language understanding.

'Multitasking' is an operating system concept that allows multiple programs to run concurrently by 'sharing the same CPU time.' This enables users to switch between applications seamlessly.