CYBERTOOLS-2: Nmap Complete Guide

A few Important Nmap scans are as given below 

nmap -sS

only first step of the tcp handshake is done which is sending SYN and as a result you are a little undetectable.
The target can send back syn/ack which tells the port is open 
it can also send rsd which means port is closed
if no response then filtered
filtered port means either there is a packet filtering firewall or a normal firewall ....

nmap -sT
Does not require sudo privileges 
It performs scan using tcp packets
A total 3 way tcp handshake is done  
Will remain fingerprints and traces on the target and easily detectable.
Can take a little bit longer


nmap -sU
Since many service on internet run on tcp, udp is mostly ignored.
Which can be helpful to us.
This scan can be helpful to us but is a bit slow.
Requires root privileges


To see all other nmap scans see nmap's manual 
can be done using man command
man nmap
A screen grab for the upper command is as given below 
As well as port states and other details 

TARGET SPECIFICATIONS








HOST DISCOVERY






SCAN TECHNIQUES







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