Which of the following logically virtualizes an OSI networking model Layer 3 address domain?
- a VRF instance
- a VIC
- a VDC
A virtual routing and forwarding (VRF) instance logically virtualizes an Open Systems Interconnection (OSI) networking model Layer 3 address domain. VRFs enable a router to maintain multiple, simultaneous routing tables. Therefore, VRFs can be configured on a single router to serve multiple Layer 3 domains instead of implementing multiple hardware routers.
A virtual device context (VDC) does not logically virtualize an OSI networking model Layer 3 address domain. A VDC logically virtualizes a Cisco Nexus 7000 Series switch. A VDC is a single virtual instance of physical switch hardware. By default, the control plane of the Cisco Nexus 7000 Series switch is configured to run a single VDC. It is possible to configure multiple VDCs on the same hardware. A single VDC can contain multiple virtual local area networks (VLANs) and VRF instances.
A virtual port channel (vPC) does not logically virtualize an OSI networking model Layer 3 address domain. A vPC enables ports from multiple switches to be combined into a single port channel bundle. Conventional port channels, which are typically used to create high-bandwidth trunk links between two switches, require that all members of the bundle exist on the same switch. vPCs enable virtual domains that are comprised of multiple physical switches to connect as a single entity to a fabric extender, server, or other device.
A virtual interface card (VIC) does not logically virtualize an OSI networking model Layer 3 address domain. A VIC is a Cisco device that can be used to create multiple logical network interface cards (NICs) and host bus adapters (HBAs). VICs such as the Cisco M81KR send Fibre Channel over Ethernet (FCoE) traffic and normal Ethernet traffic over the same physical medium.