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Difficulty: MediumNetworking Ports and Protocols

A help desk technician is configuring a third-party email application on a corporate laptop. The company security administrator mandates that all email retrieval must be encrypted using SSL/TLS and must maintain real-time folder synchronization across multiple user devices. Which network port and protocol combination must be permitted through the network firewall to support this configuration?

  1. TCP 993Answer
  2. B
    TCP 995
  3. C
    TCP 143
  4. D
    UDP 67

Answer

TCP port 993 (IMAPS) must be permitted to allow encrypted email retrieval with multi-device folder synchronization.
The correct answer specifies TCP port 993 because IMAPS provides encrypted SSL/TLS communication while ensuring server-side email storage and multi-device state synchronization as required by corporate security policy.

Step-by-Step Solution

1
Identify the synchronization requirements specified in the scenario
The requirement specifies multi-device state and folder synchronization, indicating IMAP rather than POP3.
IMAP keeps emails on the server so changes sync across devices, whereas POP3 downloads and typically deletes messages from the server.
2
Determine the required security level for the protocol
The policy requires SSL/TLS encryption, identifying the protocol as IMAPS.
Standard unencrypted IMAP operates on TCP 143, whereas IMAPS adds TLS/SSL protection.
3
Map IMAPS to its standard default port number
IMAPS defaults to TCP port 993.
TCP 993 is the standard IANA-assigned port for encrypted IMAP traffic.

Key Concept

Secure Mail Protocols and Port Assignment (IMAPS)
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Topics

Networking Ports and Protocols

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