312-50V11 · Question #731
You have successfully gained access to your client's internal network and successfully comprised a Linux server which is part of the internal IP network. You want to know which Microsoft Windows works
The correct answer is C. 445. The question tests knowledge of well-known port numbers, specifically which port Windows uses for SMB file sharing. Port 445 is the answer.
Question
You have successfully gained access to your client's internal network and successfully comprised a Linux server which is part of the internal IP network. You want to know which Microsoft Windows workstations have file sharing enabled. Which port would you see listening on these Windows machines in the network?
Options
- A161
- B3389
- C445
- D1433
How the community answered
(24 responses)- A8% (2)
- C88% (21)
- D4% (1)
Why each option
The question tests knowledge of well-known port numbers, specifically which port Windows uses for SMB file sharing. Port 445 is the answer.
Port 161 is used by SNMP (Simple Network Management Protocol) for network device monitoring, not file sharing.
Port 3389 is used by RDP (Remote Desktop Protocol) for remote graphical desktop access, not file sharing.
Port 445 is used by Microsoft's SMB (Server Message Block) protocol, which provides Windows file and printer sharing functionality over TCP/IP networks. When a Windows machine has file sharing enabled, it listens on port 445 for incoming SMB connections from other hosts. This port replaced the older NetBIOS-based file sharing on port 139 and is the primary indicator of Windows file sharing exposure on a network.
Port 1433 is used by Microsoft SQL Server for database connections, not Windows file sharing.
Concept tested: Windows SMB file sharing port identification - port 445
Source: https://learn.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/troubleshooting-smb-windows
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