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350-401 Practice Question: Which two statements about IP Source Guard are…
Which two statements about IP Source Guard are true? (Choose two.)
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
✓
IP Source Guard uses the DHCP snooping binding table to validate the source IP address of packets received on a port.
IP Source Guard (IPSG) is a security feature that filters IP traffic on untrusted Layer 2 ports based on the DHCP snooping binding table or static IP source bindings. It can be configured with or without port security. IPSG is typically applied on access ports facing end devices. Option C is incorrect because IPSG can be used with both static and DHCP-assigned IP addresses. Option D is incorrect because IPSG filters traffic at Layer 3 (IP), not Layer 2. Option E is incorrect because IPSG does not require 802.1X authentication; it can operate independently.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
IP Source Guard uses the DHCP snooping binding table to validate the source IP address of packets received on a port.
Why this is correct
Correct because IPSG relies on the DHCP snooping database to determine allowed source IPs.
- ✓
IP Source Guard can be configured with port security to provide additional MAC address filtering.
Why this is correct
Correct because IPSG and port security can be combined to enforce both IP and MAC address filtering.
- ✗
IP Source Guard only works with DHCP-assigned IP addresses, not static IP addresses.
Why it's wrong here
Incorrect because static IP source bindings can be manually configured to support static IPs.
- ✗
IP Source Guard filters traffic based on the destination MAC address.
Why it's wrong here
Incorrect because IPSG filters based on source IP address, not destination MAC.
- ✗
IP Source Guard requires 802.1X authentication to be enabled on the port.
Why it's wrong here
Incorrect because IPSG can operate without 802.1X; it only needs DHCP snooping or static bindings.
Visual reference
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
Go deeper
Related to this question
Learn chapter
Network Access Control and AAA
Key term
L2 Security Features
L2 Security Features are network security mechanisms that operate at Layer 2 of the OSI model to protect local network traffic from threats like MAC spoofing, ARP attacks, and unauthorized access.
Key term
Cisco TrustSec
Cisco TrustSec is a security architecture that uses identity-based access control and encryption to protect network traffic, rather than relying only on IP addresses and VLANs.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.