Day 01/100 - Network Scanning Basics: Understanding TCP -sT with Nmap

Описание: NMAP
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0:00 - NMAP
0:10 - Basic Nmap Command Structure
0:20 - Basic TCP Scan with Nmap
0:30 - Three way handshake
0:40 - Example Output:
0:50 - Key Takeaways
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Nmap, short for "Network Mapper," is a powerful open-source tool used for network discovery and security auditing.
It is designed to discover hosts and services on a computer network, creating a "map" of the network's structure.
Nmap is widely used by network administrators, security professionals, and ethical hackers for various purposes, including network inventory, vulnerability assessment, and penetration testing.
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A TCP scan is one of the fundamental types of network scans, and it helps identify open ports on a target system.
Command:
nmap -sT target
Explanation:
nmap: Initiates the Nmap tool.
-sT: Specifies the TCP connect scan. This is a basic and straightforward scan type where Nmap attempts to establish a full TCP connection to each scanned port. It completes the three-way handshake (SYN, SYN-ACK, ACK) to determine the state of each port.
target: Represents the IP address or hostname of the target system.
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PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
443/tcp open https
PORT: The number of the open port.
STATE: The state of the port (e.g., "open" means the port is accessible).
SERVICE: The service associated with the open port (e.g., ssh, http, https).

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A TCP connect scan (-sT) is simple but effective for identifying open ports on a target system.
The output provides information about the state of each scanned port and the associated services.
Use the knowledge of open ports and services to assess the target's security and potential vulnerabilities.

Remember to always ensure that you have proper authorization before scanning any network or system. Unauthorized scanning can have legal consequences.


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