Huawei Certified Network Associate – Routing and Switching (HCNA-RS, legacy) — Question 64

Which of the following statements about Ethernet sub-interfaces is/are true?

Answer options

• A. The sub-interface ID must be the same as the VLAN ID.
• B. A sub-interface can be bound to multiple VLANs.
• C. The sub-interface cannot be configured with an IP address.
• D. The IP addresses for sub-interfaces must not be on the same network segment.

Correct answer: C

Explanation

The correct answer is C because sub-interfaces are designed to be configured with IP addresses, which is a fundamental characteristic of their operation. Options A and B are incorrect as they misrepresent the relationship between sub-interfaces and VLANs; a sub-interface ID does not have to match the VLAN ID, and it cannot be bound to multiple VLANs. Option D is misleading as sub-interfaces can indeed have IP addresses on the same network segment as long as they are on different subnets.