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Transaction data consists of connection level, application-specific records generated from network traffic. It provides information about the source, destination, protocol, and application of each network connection. Transaction data can be used to identify anomalies, malicious activities, and user behaviors on the network. References := Cisco CyberOps Engineer

NetFlow provides a more efficient way of recording and analyzing network traffic patterns over an extended period of time compared to syslog messages, full packet capture, or firewall event logs. It collects metadata about traffic flows traversing the network devices which can be used for understanding normal baseline behavior as well as identifying anomalies. References := Cisco Certified CyberOps Associate Overview

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. References := Cisco Cybersecurity Operations Fundamentals, Module 2: Security Monitoring, Lesson 2.3: Cryptography and PKI, Topic 2.3.1: Cryptography

The /var/log/auth.log file contains information about authentication and authorization events on a Linux system, such as successful and failed logins, sudo commands, and SSH sessions. The output in the exhibit shows a failed login attempt from a user named “root” using SSH. References: https://www.cisco.com/c/en/us/td/docs/security/ise/2-4/admin_guide/b_ise_admin_guide_24/b_ise_admin_guide_24_new_chapter_01101.html

The purpose of command and control (C&C) for network-aware malware is to allow an attacker to remotely control compromised systems. This includes sending commands to the malware, receiving data from the infected host, and updating the malware to evade detection or enhance its capabilities.

The CBROPS course materials cover the topic of network-aware malware and the role of command and control servers in managing such malware

In this scenario, the threat actor refers to the individuals or entities responsible for the attack that resulted in a breach of assets and sensitive information. The receptionist received a threatening call but did not take action, leading to an actual breach within 48 hours. References: The explanation is inferred from general cybersecurity knowledge as specific details are not provided in the Cisco Cybersecurity documents linked.