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Answer :
When discussing Cisco TrustSec, it's important to understand how it integrates security group tags (SGTs) in network communications to enhance security posture and simplify policy enforcement. The statement that is true about Cisco TrustSec propagation is: 3. Inline tagging inserts the source SGT into an Ethernet frame.
Here's how it works:
Cisco TrustSec uses SGTs to categorize different types of network traffic based on their security policies. This helps in defining and enforcing security policies based on the type of user, device, or application traffic being sent and received.
Inline Tagging is a feature that tags packets inline as they move through a switch or router. This process involves inserting an SGT into an Ethernet frame so that the security policies tied to that SGT can be consistently enforced throughout the network.
Specifically, Inline Tagging inserts the source SGT into an Ethernet frame. The tagging occurs at the source switch or router interface, and this tag travels with the packet so that each network device understands the security context of that packet without having to make further queries.
Security Group Tagging Protocol (SXP) is another method often mentioned in this context. It's noteworthy that SXP is primarily used to propagate SGT-to-IP bindings between network devices when inline tagging or certain platforms do not support direct TrustSec tagging. However, inline tagging directly embeds the SGT in the data packets passing through.
In summary, Cisco TrustSec enhances network security by allowing for identity-based security using SGTs, and inline tagging directly incorporates these tags into the network frames to facilitate seamless policy enforcement.
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