Symmetric encryption is a type of encryption that uses the same key to encrypt and decrypt data. Asymmetric encryption is a type of encryption that uses a pair of keys: a public key and a private key. The public key can be used to encrypt data, but only the private key can decrypt it, and vice versa. An advantage of symmetric encryption over asymmetric encryption is that it is faster and more efficient for encrypting large amounts of data, such as in sessions or bulk transfers. Asymmetric encryption is slower and more computationally intensive, but it is more secure and suitable for key exchange or digital signatures. Reference:= Cisco Cybersecurity Operations Fundamentals, Module 2: Security Monitoring, Lesson 2.3: Cryptography and PKI, Topic 2.3.1: Cryptography

CIA stands for confidentiality, integrity, and availability, which are the three main objectives of information security. Confidentiality means protecting the information from unauthorized access or disclosure. Integrity means ensuring the information is accurate and consistent, and preventing unauthorized modification or deletion. Availability means ensuring the information and systems are accessible and usable by authorized users when needed. References:
https://learningnetworkstore.cisco.com/on-demand-e-learning/understanding-cisco-cybersecurity-operations-fund (Module 2: Security Concepts, Lesson 2.1: Security Principles)

Preparation --> Detection and Analysis --> Containment, Erradicaion and Recovery --> Post-Incident Activity Detection and Analysis --> Profile networks and systems, Understand normal behaviors, Create a log retention policy, Perform event correlation. Maintain and use a knowledge base of information.Use Internet search engines for research. Run packet sniffers to collect additional data. Filter the data. Seek assistance from others.
Keep all host clocks synchronized. Know the different types of attacks and attack vectors. Develop processes and procedures to recognize the signs of an incident. Understand the sources of precursors and indicators.
Create appropriate incident documentation capabilities and processes. Create processes to effectively prioritize security incidents. Create processes to effectively communicate incident information (internal and external communications).
Ref: Cisco CyberOps Associate CBROPS 200-201 Official Cert Guide