Configure Ethernet Flow Point Frames on Cisco Service Provider VPN Services

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In a Service Provider network, an Ethernet flow point (EFP) is a reference to an Ethernet port on a service provider edge router. It is used to provide Ethernet virtual connections (EVC) that carry traffic between customer sites over a service provider's network. An EFP can be configured to apply various functions to the Ethernet frames that traverse it, including VLAN tagging, Quality of Service (QoS) classification, policing, and shaping.

Of the options given, the following two frames can be configured on an Ethernet flow point:

A. Frames of a specific VLAN: An EFP can be configured to apply VLAN tagging to frames that traverse it. VLAN tagging enables the EFP to identify the VLAN to which a frame belongs and segregate traffic into different VLANs.

D. Frames with different class of service (CoS) values: An EFP can be configured to classify incoming frames based on their CoS values. CoS is used to differentiate traffic based on its priority level. This enables the EFP to prioritize traffic based on its criticality and provide differentiated QoS to different traffic classes.

B, C, and E are incorrect:

B. Frames with different type of service (ToS) values: ToS is an outdated field in the IP header that is used to indicate the priority level of IP packets. However, ToS is not used in Ethernet frames, so it cannot be configured on an EFP.

C. Frames with identical type of service value: Identical ToS values are not relevant to Ethernet frames, so this option is incorrect.

E. Frames with no tags: An EFP can be configured to apply VLAN tagging to frames that traverse it. If an EFP is configured to apply VLAN tagging, it will add a VLAN tag to all frames that traverse it, even if the frames were not originally tagged. Therefore, frames with no tags are not an option that can be configured on an EFP.