Explanation
Resource exhaustion is a type of denial-of-service attack; however, it can also be used to evade detection by security defenses. A simple definition of resource exhaustion is "consuming the resources necessary to perform an action." Cisco CyberOps Associate CBROPS 200-201 Official Cert Guide

Explanation
Session data provides information about the five tuples; source IP address/port number, destination IP address/port number and the protocol What is Connectivity Data? According to IBM - Connectivity data defines how entities are connected in the network. It includes connections between different devices, and VLAN-related connections within the same device https://www.ibm.com/docs/en/networkmanager/4.2.0?topic=relationships-connectivity-data

Social engineering attacks are techniques that exploit human psychology and behavior to manipulate or deceive people into performing actions or divulging information that can compromise the security of the organization. An example of a social engineering attack is receiving an email from human resources requesting a visit to their secure website to update contact information. This could be a phishing attempt to trick the user into clicking on a malicious link or entering their credentials on a fake website that looks like the legitimate one. Reference:= Cisco Cybersecurity Operations Fundamentals - Module 6: Security Incident Investigations