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Huawei H12-821_V1.0 Exam - Topic 5 Question 100 Discussion

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?
C) SMTP
A) FTP
B) SIP
D) H.323
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.

Huawei H12-821_V1.0 Exam - Topic 5 Question 100 Discussion

Actual exam question for Huawei's H12-821_V1.0 exam
Question #: 100
Topic #: 5
[All H12-821_V1.0 Questions]

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?

Show Suggested Answer Hide Answer
Suggested Answer: C

Comprehensive and Detailed Step-by-Step

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.


HCIA-Datacom Study Guide, Chapter: Firewall ASPF Configuration

Huawei Multi-Channel Protocol Handling

by Tina at Jul 01, 2026, 02:02 AM

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Rodolfo
I practiced a question like this before, and I think SMTP is the correct answer since it handles emails on a single channel.
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Joanne
5 days ago
H.323 definitely uses multiple channels, but I'm a bit confused about the specifics of SIP and how it compares to SMTP.
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Gwen
10 days ago
I think SMTP is the one that doesn't need ASPF since it's a single-channel protocol, right?
upvoted 0 times
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Anna
15 days ago
I remember studying that FTP and SIP both use multiple channels, but I'm not entirely sure about SMTP.
upvoted 0 times
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