ISC2 CC Network Security Practice Question
An organization wants to ensure that only authorized devices can connect to the wired network. Which TWO methods can be used to enforce this?
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
Port security limits the number of MAC addresses on a switch port, and 802.1X requires authentication before granting network access. VLANs segment but do not authenticate, and firewalls filter traffic but not at the access level.
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 requires device authentication before access.
- ✗
Firewall rules
Why it's wrong here
Firewalls control traffic after access is granted.
- ✓
Port security
Why this is correct
Port security restricts MAC addresses on a port.
- ✗
NAT
Why it's wrong here
NAT translates IP addresses, not for access control.
- ✗
VLAN segmentation
Why it's wrong here
VLANs do not authenticate devices.
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
Introduction to Security Principles
Key term
Extensible Authentication Protocol
Extensible Authentication Protocol (EAP) is a flexible authentication framework used in network access control, particularly in wireless and point-to-point connections, that supports multiple authentication methods without requiring changes to the underlying protocol.
Key term
Organization
An Organization is a top-level container in Google Cloud that represents your company or entities and serves as the root node for all your cloud resources, policies, and access control.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 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 CC exam.