In the context of IoT Information Security, what does 'Non-Repudiation' mean?
Non-repudiation (often achieved via digital signatures and public key cryptography) provides proof of the origin and integrity of data so that the sender cannot claim they did not send it.
What is the function of a 'Gas Sensor' such as MQ-2 or MQ-135 in IoT environmental monitoring?
The MQ series of gas sensors (like MQ-2 for LPG/smoke, MQ-135 for air quality/CO2) detect gaseous chemical concentrations and output corresponding analog signals.
Which term describes a network of interconnected physical devices embedded with electronics, software, sensors, actuators, and connectivity to exchange data?
This is the classic, formal definition of the Internet of Things (IoT).
Which protocol provides secure, encrypted end-to-end communication channels for IoT transport layer connectivity over TCP?
TLS (Transport Layer Security) encrypts communication channels over TCP, preventing eavesdropping and message tampering (used in MQTT-TLS / MQTTS and HTTPS).
Which encryption protocol variant is specifically adapted for UDP-based constrained IoT communication (such as CoAP)?
DTLS (Datagram Transport Layer Security) provides security equivalent to TLS but is designed for datagram (UDP-based) communication protocols like CoAP.