A network engineer is configuring Cisco TrustSec and needs to ensure that the Security Group Tag is being transmitted between two devices. Where in the Layer 2 frame should this be verified?
The correct answer is 802.1 AE header. According to the Cisco TrustSec Configuration Guide, the SGT is embedded into the ethernet frame using the 802.1 AE header, which is also known as MACsec. This allows the SGT to be carried to the next hop ethernet neighbor without requiring any changes to the payload or the 802.1Q field. The CMD field is not a part of the Layer 2 frame, but a part of the Cisco TrustSec header that contains the SGT and other information.
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