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Which of the following most likely requires the use of subinterfaces?
Correct Answer: A
* Introduction to Subinterfaces: * Subinterfaces are logical interfaces created on a single physical interface. They are used to enable a router to support multiple networks on a single physical interface. * Use Case for Subinterfaces: * Subinterfaces are commonly used in scenarios where VLANs are implemented. A router with a single physical LAN port can be configured with multiple subinterfaces, each associated with a different VLAN. * This setup allows the router to route traffic between different VLANs. * Example Configuration: * Consider a router with a single physical interfaceGigabitEthernet0/0and two VLANs, 10 and 20. interface GigabitEthernet0/0.10 encapsulation dot1Q 10 ip address 192.168.10.1 255.255.255.0 ! interface GigabitEthernet0/0.20 encapsulation dot1Q 20 ip address 192.168.20.1 255.255.255.0 * Theencapsulation dot1Qcommand specifies the VLAN ID. * Explanation of the Options: * A. A router with only one available LAN port:This is correct. Subinterfaces allow a single physical interface to manage multiple networks, making it essential for routers with limited physical interfaces. * B. A firewall performing deep packet inspection:Firewalls can use subinterfaces, but it is not a requirement for deep packet inspection. * C. A hub utilizing jumbo frames:Hubs do not use subinterfaces as they operate at Layer 1 and do not manage IP addressing. * D. A switch using Spanning Tree Protocol:STP is a protocol for preventing loops in a network and does not require subinterfaces. * Conclusion: * Subinterfaces provide a practical solution for routing between multiple VLANs on a router with limited physical interfaces. They allow network administrators to optimize the use of available hardware resources efficiently. References: * CompTIA Network+ guide detailing VLAN configurations and the use of subinterfaces (see pageRef 9†Basic Configuration Commands).