Which of the following port types allows only FabricPath VLAN traffic?
- a trunk port
- a core port
- an access port
- an edge port
Of the available choices, only a Cisco FabricPath core port allows only FabricPath virtual local area network (VLAN) traffic. Cisco FabricPath uses Open Systems Interconnection (OSI) networking model Layer 3 routing combined with Layer 2 switching to construct a unified and scalable Layer 2 fabric. Although Cisco FabricPath defines two types of ports, only core ports are considered to be part of the FabricPath network. Core ports forward Ethernet frames encapsulated within a FabricPath header. In addition, core ports are always trunk ports that include an Institute of Electrical and Electronics Engineers (IEEE) 802.1Q VLAN tag. Only FabricPath VLANs are allowed on core ports.
Classic Ethernet VLAN traffic is allowed on an edge port. An edge port is a Cisco FabricPath component port that does not operate as part of the FabricPath network. Instead, edge ports send only normal Ethernet frames as part of a classic Layer 2 switched network. An edge port can be configured as either an access port or an IEEE 802.1Q trunk port.
Although all core ports are trunk ports, not all trunk ports are core ports. Therefore, a trunk port could carry either FabricPath VLAN traffic or classic Ethernet VLAN traffic depending on the circumstances and configuration. Trunk ports enable switches to transmit and receive data on multiple VLANs over the same link.
An access port carries either FabricPath VLAN traffic or classic Ethernet VLAN traffic, depending on the circumstances and configuration. An access port is a switch port that typically connects to an end device, such as a server or workstation. Access ports transmit and receive data on a single VLAN. Core ports cannot be access ports.