An attacker scan for RPC services listing on a Unix/Linux host. This type
						of scan can be obtained via native operating system utilities or via port
						scanners like nmap. When performed by a scanner, an RPC datagram is sent to
						a list of UDP ports and the response is recorded. Particular types of
						responses can be indicative of well known RPC services running on a UDP
						port.1. Speed: Direct RPC scans that bypass portmapper/sunrpc are typically
							slow compare to other scan types2. Stealth: RPC scanning is not stealthy, as IPS/IDS systems detect
							RPC queries3. Open Port: Can only detect open ports when an RPC service
							responds4. Closed Port: Detects closed ports on the basis of ICMP diagnostic
							messages.5. Filtered Port: Cannot identify filtered ports6. Unfiltered Port: Cannot identify unfiltered ports