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Zorluk: Çok zorNetworking Ports and Protocols

A network administrator is troubleshooting an issue where corporate mobile users cannot synchronize incoming mail folders across multiple endpoints when connected to the internal Wi-Fi network. Outbound traffic filtering logs show that connections to the remote mail server on TCP port 993 are being blocked by the network firewall, whereas outbound connections on TCP port 465 and TCP port 995 are explicitly permitted. The enterprise mail architecture requires secure connection establishment and real-time multi-device folder state synchronization. Which of the following firewall configuration changes should the administrator make to resolve the issue while preserving the required email synchronization features?

  1. Add a firewall rule to permit outbound traffic on TCP port 993 for IMAPS.Cevap
  2. B
    Reconfigure the mobile client profiles to retrieve email using TCP port 995.
  3. C
    Modify the existing firewall rule to permit outbound UDP port 993 traffic.
  4. D
    Change the incoming mail client settings to connect via TCP port 110 with TLS encryption.

Cevap

Add a firewall rule to permit outbound traffic on TCP port 993 for IMAPS.
The correct action is to permit outbound traffic on TCP port 993. IMAP (Internet Message Access Protocol) is specifically designed to synchronize mail states and folder structures across multiple devices. Secure IMAP (IMAPS) uses TCP port 993 to establish encrypted sessions between client endpoints and the mail server.

Adım Adım Çözüm

1
Analyze the technical requirements for email synchronization.
The requirement specifies real-time multi-device folder synchronization, which requires IMAP rather than POP3.
POP3 downloads messages locally to a single client, whereas IMAP maintains folder states centrally across multiple devices.
2
Identify the standard secure port for the required protocol.
IMAPS (IMAP over SSL/TLS) uses TCP port 993.
Security policy requires encrypted communication, making implicitly secure IMAPS on TCP 993 the correct choice.
3
Evaluate firewall logs against the identified protocol and port requirements.
Firewall logs confirm TCP port 993 traffic is currently blocked.
Permitting outbound TCP port 993 traffic directly restores IMAPS connectivity without compromising security or feature requirements.

Anahtar Kavram

Email Protocols and Port Mapping (IMAP vs POP3, Secure Ports)
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Konular

Networking Ports and Protocols

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