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Question 563 of 1,420
mediumDrag & DropObjective-mapped
350-401 Practice Question: Drag and drop the steps of IP Source Guard…
Drag and drop the steps of IP Source Guard binding and enforcement into the correct order, from first to last.
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Correct answer & explanation
✓
Switch learns IP-to-port binding from DHCP snooping
IP Source Guard first builds the binding from DHCP snooping, then installs a per-port ACL to permit only the bound IP, applies the ACL to the access port, checks all incoming IP traffic against the ACL, and drops any traffic with a source IP not in the binding.
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Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of IP Source Guard binding and enforcement into the correct order, from first to last.
medium- ✓ A.Enable DHCP snooping to populate binding table
- ✓ B.Enable IP Source Guard on the access interface
- ✓ C.Switch creates per-port VLAN ACL from binding
- ✓ D.Packet arrives and source IP is checked against binding
- ✓ E.Forward packet if IP matches or drop if mismatch
Why A: IP Source Guard relies on the DHCP snooping binding table. It is enabled on an interface, and then the switch creates a PVACL based on the binding. When a packet arrives, the source IP is checked against the binding; if it matches, the packet is forwarded; otherwise, it is dropped.
Last reviewed: Jun 18, 2026
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