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350-401 Practice Question: Drag and drop the steps of MAB (MAC…
Drag and drop the steps of MAB (MAC Authentication Bypass) fallback flow into the correct order, from first to last.
Answer choices
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Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Host connects; switch detects link up
MAB is a fallback method when 802.1X fails: the switch detects the host MAC, sends a RADIUS Access-Request with the MAC as username/password, ISE checks the MAC against its database, and then either grants access (placing the port in the authorized VLAN) or denies it.
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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Network Access Control and AAA
Key term
MAB Authentication
MAB Authentication is a network access control method that grants or denies device access to a network by checking the device's MAC address against a list of approved addresses.
Key term
RADIUS vs TACACS+
RADIUS and TACACS+ are two network protocols used to verify user identities and control access to network devices and services, with different approaches to security and flexibility.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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