350-701 Endpoint Protection and Detection Practice Question
Exhibit
Refer to the exhibit. interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ip verify source ip dhcp snooping limit rate 10 ip dhcp snooping trust ! interface GigabitEthernet0/2 switchport mode access ip verify source ip dhcp snooping limit rate 5 ! ip dhcp snooping vlan 10 ! ip source binding 0050.7966.6801 vlan 10 192.168.1.10 interface GigabitEthernet0/2
Refer to the exhibit. A network administrator configured IP Source Guard and DHCP Snooping on a switch. A host connected to GigabitEthernet0/2 with MAC address 0050.7966.6801 has been assigned IP 192.168.1.10 via DHCP. The host now tries to use IP 192.168.1.20. What will happen?
⚠ Common exam trap
Cisco often tests the misconception that IP Source Guard allows traffic from a trusted host or that it dynamically updates bindings via ARP, when in fact it strictly enforces the DHCP snooping binding table and drops any non-matching traffic.
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
✓
The switch drops all traffic from the host with source IP 192.168.1.20.
IP Source Guard uses DHCP snooping binding table to enforce IP-to-port mapping. When the host at GigabitEthernet0/2 with MAC 0050.7966.6801 attempts to use IP 192.168.1.20 instead of its DHCP-assigned IP 192.168.1.10, the switch compares the source IP of the packet against the binding table. Since 192.168.1.20 is not bound to that port and MAC, the switch drops all traffic from that host with source IP 192.168.1.20, preventing IP spoofing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The switch drops all traffic from the host with source IP 192.168.1.20.
Why this is correct
IP Source Guard filters traffic based on the binding table; unmatched source IPs are dropped.
- ✗
The switch sends an ARP probe to verify the IP is unused, then updates the binding.
Why it's wrong here
IP Source Guard does not perform ARP probes; it drops mismatched traffic.
- ✗
The switch updates the binding table to allow 192.168.1.20.
Why it's wrong here
The binding table is not dynamic; it requires DHCP or manual entry.
- ✗
The switch allows the traffic because the host is trusted on that port.
Why it's wrong here
The port is not trusted; trust is only on G0/1. The binding table restricts allowed IPs.
Visual reference
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-701 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-701 exam.