Privileged scanning, also known as credentialed scanning, is a type of vulnerability scanning that uses a valid user account to log in to the target host and examine vulnerabilities from a trusted user's perspective. It can provide more accurate and comprehensive results than unprivileged scanning, which does not use any credentials and only scans for externally visible vulnerabilities.

SNMP v3 adds cryptographic security to SNMP v2. SNMP v3 replaces the simple password sharing (as clear text) in SNMP v2 with a much more secure encoded security parameters.
HTTPS is HTTP with encryption and verification. The only difference between the two protocols is that HTTPS uses TLS (SSL) to encrypt normal HTTP requests and responses, and to digitally sign those requests and responses. As a result, HTTPS is far more secure than HTTP.
Telnet transfers the data in simple plain text. On other hand SSH uses Encrypted format to send data and also uses a secure channel. As SSH is more secure so it uses public key encryption for authentication.

Explanation
SIEM event correlation is an essential part of any SIEM solution. It aggregates and analyzes log data from across your network applications, systems, and devices, making it possible to discover security threats and malicious patterns of behaviors that otherwise go unnoticed and can lead to compromise or data loss.

laaS (Infrastructure as a Service) is a cloud model that provides clients with servers, storage, and networks but nothing else. It allows clients to have more control and flexibility over the configuration and management of their infrastructure resources, but also requires them to install and maintain their own operating systems, applications, etc.

Symmetric encryption is a means of protecting data using a secret key to encrypt (lock) and decrypt (unlock) it. The sender and recipient share the key or password to gain access to the information. The key can be a word; a phrase; or a nonsensical or random string of letters, numbers, and symbols.