350-601 Security Practice Question
Which THREE methods can be used to propagate Cisco TrustSec Security Group Tags (SGTs) across a network? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between discovery protocols (CDP/LLDP) and actual SGT propagation mechanisms; the trap here is assuming that any Cisco proprietary protocol can carry SGTs, when in fact only SXP, inline tagging, and VXLAN GBP are valid.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VXLAN with group-based policy
VXLAN with group-based policy (GBP) is a valid method for propagating SGTs because it embeds the SGT into the VXLAN Group Policy ID (GPID) field within the VXLAN header. This allows the SGT to be carried across an overlay network, enabling scalable, policy-based segmentation in a fabric environment without requiring inline tagging or SXP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VXLAN with group-based policy
Why this is correct
VXLAN can carry SGTs in the Group Policy ID (GPI) field.
- ✓
SXP (SGT Exchange Protocol)
Why this is correct
SXP is a widely used protocol for exchanging SGTs between TrustSec domains.
- ✓
802.1Q tag (inline tagging)
Why this is correct
SGTs can be embedded in the 802.1Q tag of Ethernet frames as inline tags.
- ✗
CDP (Cisco Discovery Protocol)
Why it's wrong here
CDP does not support SGT propagation; it's used for device discovery.
- ✗
LLDP
Why it's wrong here
LLDP is a standard neighbor discovery protocol, not for SGT propagation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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