Network mapping involves identifying and documenting the devices and pathways in a network. This typically includes gathering private and public IP addresses, banner grabbing, and performing tracerouting to understand the network's structure and communication routes. Collecting employee information is not part of manual network mapping as it does not directly relate to the physical or logical layout of the network.
The Internet Printing Protocol (IPP) is related to printers and can be associated with SNMP (Simple Network Management Protocol), which is used for managing devices on IP networks including printers. If John suggests removing IPP printing capability as a countermeasure, it is likely to prevent SNMP enumeration. SNMP enumeration involves querying the SNMP service for information about network devices, and removing IPP printing can help mitigate this risk.