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Question

Difficulty: MediumNetworking Ports and Protocols

A systems administrator is configuring firewall access control lists to enable direct file sharing between Windows workstations and a centralized storage server located on a separate subnet. The network environment operates without legacy NetBIOS transport layers. Which port must be permitted through the firewall to allow native Server Message Block (SMB) communication over TCP?

  1. TCP 445Answer
  2. B
    TCP 139
  3. C
    TCP 389
  4. D
    UDP 67

Answer

TCP port 445 is used for direct, native Server Message Block (SMB) communications over IP without NetBIOS encapsulation.
Modern operating systems use direct SMB over TCP port 445 for sharing files and network resources across subnets, bypassing the legacy NetBIOS Session Service.

Step-by-Step Solution

1
Identify the protocol requested in the scenario
The scenario specifies native Server Message Block (SMB) direct file sharing without legacy NetBIOS transport.
Modern networks route SMB directly over TCP/IP without needing NetBIOS Session Service layer encapsulation.
2
Map the protocol to its standardized TCP/IP port
Direct SMB over TCP uses port 445.
TCP port 445 is the standard port for direct-host SMB traffic.

Key Concept

Server Message Block (SMB) Port Assignment
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Topics

Networking Ports and Protocols

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