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

An attack surface is the total sum of vulnerabilities that can be exploited to carry out a security attack. Attack surfaces can be physical or digital. The term attack surface is often confused with the term attack vector, but they are not the same thing. The surface is what is being attacked; the vector is the means by which an intruder gains access.