A penetration tester performs OS fingerprinting on the target server to identify the operating
system used on the target server with the help of ICMP packets.
While performing ICMP scanning using Nmap tool, message received/type displays “3 – Destination Unreachable[5]” and code 3.
Which of the following is an appropriate description of this response?
A.
Destination port unreachable
B.
Destination host unavailable
C.
Destination host unreachable
D.
Destination protocol unreachable
A
Ans is A
TYPE-3 (Destination Unreachable) codes
0 Net Unreachable
1 Host Unreachable
2 Protocol Unreachable
3 Port Unreachable
4 Fragmentation Needed and Don’t Fragment was Set
5 Source Route Failed
6 Destination Network Unknown
7 Destination Host Unknown
8 Source Host Isolated
9 Communication with Destination Network is
Administratively Prohibited
10 Communication with Destination Host is
Administratively Prohibited
11 Destination Network Unreachable for Type of Service
12 Destination Host Unreachable for Type of Service
13 Communication Administratively Prohibited [RFC1812]
14 Host Precedence Violation [RFC1812]
15 Precedence cutoff in effect [RFC1812]