Which two frames can be configured on an Ethernet flow point? (Choose two.)

An Ethernet Flow Point (EFP) is a logical subinterface within the Ethernet Virtual Connection (EVC) framework used to classify and direct traffic based on Layer 2 frame criteria. The primary classification method is based on the presence and value of VLAN tags. An EFP can be configured to match frames tagged with a specific 802.1Q VLAN ID using the encapsulation dot1q command. Additionally, an EFP can be configured to classify frames that are untagged (i.e., have no VLAN tag) using the encapsulation untagged command. These two options represent fundamental and distinct types of frames that an EFP can be configured to process.

B. with different type of service values: Type of Service (ToS) is a Layer 3 IP header field. EFPs are Layer 2 constructs and classify frames based on Layer 2 header information, not Layer 3.
C. with identical type of service value: This is incorrect for the same reason as option B. ToS is a Layer 3 field, and EFP classification operates at Layer 2.
D. with different class of service values: While an EFP can match on a specific Class of Service (CoS) value within a VLAN tag, this is a sub-classification of tagged frames, not a distinct frame type like tagged vs. untagged.

1. Cisco Systems, "Carrier Ethernet Configuration Guide, Cisco IOS XE Gibraltar 16.12.x".

Reference: Chapter: "Configuring Ethernet Virtual Connections", Section: "Configuring a Service Instance".

Details: This section documents the encapsulation command used under a service instance (EFP). It explicitly lists dot1q for matching frames "of a specific VLAN" and untagged for matching frames "with no tags" as primary configuration options.

2. Cisco Systems, "IP Routing: OSPF and BGP Configuration Guide, Cisco IOS XE Fuji 16.8.x".

Reference: Chapter: "Ethernet Virtual Connections", Section: "EVCs Overview".

Details: This document states, "An EFP is a logical demultiplexing point where a large physical interface (port) can be segmented into multiple logical interfaces for data-plane processing. An EFP is used to classify frames to a service instance based on the VLAN ID, a range of VLAN IDs, or for untagged frames." This directly supports that EFPs are configured for specific VLANs and for untagged frames.