Refer to the exhibit. An engineer must configure Cisco Catalyst SD-WAN connectivity between an on-premises data center and AWS. The GigabitEthernet0 interface is used for public Internet…

Question

Exhibit

Options

• Ainterface GigabitEthernet0.221
• Binterface GigabitEthernet0.221 ip unnumbered GigabitEthernet0.221
• Cinterface GigabitEthernet0.221 encapsulation dot1Q 221
• Dinterface GigabitEthernet0.221

• A
  10% (3)
• B
  6% (2)
• C
  81% (25)
• D
  3% (1)

Explanation

The command interface GigabitEthernet0.221 encapsulation dot1Q 221 is required to complete the subinterface configuration. In Cisco devices, when configuring a subinterface for use with a specific VLAN (such as for AWS Direct Connect), you must specify the IEEE 802.1Q encapsulation and VLAN ID. Here, .221 in the interface name indicates subinterface for VLAN 221, so the correct encapsulation command is necessary for proper Layer 2 and Layer 3 connectivity to AWS Direct Connect. Without this command, the subinterface will not be able to process or tag VLAN 221 traffic correctly, resulting in loss of connectivity.

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