CompTIA Network+ (N10-009) — Question 138

Which of the following most likely requires the use of subinterfaces?

Answer options

• A. A router with only one available LAN port
• B. A firewall performing deep packet inspection
• C. A hub utilizing jumbo frames
• D. A switch using Spanning Tree Protocol

Correct answer: A

Explanation

Subinterfaces are typically used on routers to handle multiple VLANs over a single physical interface, which is the case for a router with only one available LAN port. The other options do not involve the creation of subinterfaces; firewalls, hubs, and switches operate differently and do not require this specific configuration.