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Difficulty: EasyCommon Ports and Protocols

A network technician needs to permit direct Server Message Block (SMB) file sharing traffic through an internal firewall between two subnets. Which protocol and default port combination must be allowed?

  1. TCP port 445Answer
  2. B
    UDP port 445
  3. C
    TCP port 21
  4. D
    UDP port 69

Answer

TCP port 445 must be allowed for direct SMB file sharing.
Server Message Block (SMB) enables direct file sharing over TCP port 445. It relies on TCP to guarantee reliable delivery and ordered sequencing of file data across network subnets.

Step-by-Step Solution

1
Identify the required network service and protocol.
The scenario specifies direct Server Message Block (SMB) file sharing.
SMB is the standard protocol for sharing files and printer resources across IP networks.
2
Determine the transport protocol and default port for direct SMB.
Direct SMB operates using TCP over port 445.
TCP provides reliable, connection-oriented data transfer essential for file operations, and port 445 is the standard IANA port for direct SMB over IP.

Key Concept

Server Message Block (SMB) default port and transport protocol
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Topics

Common Ports and Protocols

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