H12-821_V1.0 Exam Dumps | Typically, a protocol that occupies two ports during communication is called a multi-channel protocol.

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Question 14/140

Typically, a protocol that occupies two ports during communication is called a multi-channel protocol.
For such protocols, the ASPF function must be enabled on the firewall to ensure smooth setup of the data channel and reduce the risk of attacks. Which of the following protocols is not a multi-channel protocol?

A. FTP

B. SIP

C. SMTP

D. H.323

Correct Answer: C

Comprehensive and Detailed Step-by-Step Explanation:
* Multi-Channel Protocols:
* Multi-channel protocols use separate channels for control and data communication, requiring application-specific packet filtering (ASPF) to track sessions.
* Examples:
* FTP (A): Uses separate control and data channels.
* SIP (B): Uses multiple ports for signaling and media.
* H.323 (D): A VoIP protocol using multiple channels.
* Single-Channel Protocol:
* SMTP (C): A single-channel protocol for email communication, which does not require ASPF.
References:
* HCIA-Datacom Study Guide, Chapter: Firewall ASPF Configuration
* Huawei Multi-Channel Protocol Handling

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