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350-701 Practice Question: Which TWO are valid methods for implementing…
Which TWO are valid methods for implementing Network Admission Control (NAC) in a Cisco environment?
⚠ Common exam trap
Cisco often tests the distinction between NAC enforcement mechanisms (like 802.1X and MAB) and Layer 2 security features (like DAI, IP source guard, and DHCP snooping), causing candidates to confuse port security or DHCP snooping with actual admission control methods.
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
✓
802.1X authentication
802.1X authentication is a valid NAC method because it enforces port-based access control by requiring end devices to authenticate via EAP (Extensible Authentication Protocol) before gaining network access. It integrates with a RADIUS server (e.g., Cisco ISE) to validate credentials and dynamically assign VLANs or ACLs based on policy, making it a core NAC technology.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
802.1X authentication
Why this is correct
802.1X is a standard for network access control.
- ✗
Dynamic ARP Inspection (DAI)
Why it's wrong here
DAI prevents ARP spoofing, not NAC.
- ✗
IP source guard
Why it's wrong here
IP source guard prevents IP spoofing, not NAC.
- ✗
DHCP snooping
Why it's wrong here
DHCP snooping is a security feature for DHCP, not NAC.
- ✓
MAC Authentication Bypass (MAB)
Why this is correct
MAB is used for devices that cannot perform 802.1X.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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