ISC2 CC Network Security Practice Question
A university wants to provide guests with internet access through the same physical wireless infrastructure used by staff, but guests must not reach internal research servers. Staff must authenticate with institutional credentials. Which combination of controls best achieves this separation?
⚠ Common exam trap
The trap here is treating wireless encryption, such as WPA3-Personal, as equivalent to user authentication and network segmentation, when it only protects the radio link.
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
✓
Separate SSIDs mapped to different VLANs, with 802.1X for staff and a guest portal for visitors.
Separate SSIDs tied to separate VLANs provide the isolation, and using 802.1X for staff plus a guest portal for visitors supplies the differentiated authentication the university needs. Shared keys, MAC filtering, and a single personal-network SSID all fail to distinguish populations or to prevent guests from reaching internal research servers, so they cannot meet the stated requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A single pre-shared key for all users plus a captive portal.
Why it's wrong here
A shared pre-shared key gives every guest and staff member the same credential, so the network cannot distinguish populations or apply different access policies, and a leaked key compromises the whole wireless infrastructure. A captive portal adds a click-through page but does not provide per-user authentication or enforce that guests cannot reach internal research servers.
- ✗
MAC address filtering that allows only registered devices on the wireless network.
Why it's wrong here
MAC address filtering is trivially bypassed by spoofing and does not authenticate users, so it cannot verify institutional credentials or reliably separate guests from staff. It also creates heavy administrative overhead as devices change, and it provides no mechanism to prevent an allowed guest device from reaching internal research servers.
- ✓
Separate SSIDs mapped to different VLANs, with 802.1X for staff and a guest portal for visitors.
Why this is correct
Separate SSIDs mapped to distinct VLANs create logical isolation between guest and staff traffic on shared hardware, and 802.1X authenticates staff against institutional credentials while a guest portal handles visitors. Together these controls enforce the requirement that guests reach only the internet and cannot access internal research servers, while staff retain authenticated access.
- ✗
WPA3-Personal on a single SSID with a rotating password posted at reception.
Why it's wrong here
A single SSID with a shared rotating password still treats all users identically once they know the password, so guests and staff share the same network segment and access rights. WPA3-Personal encrypts the wireless link but does not perform per-user authentication or enforce that visitors are barred from internal research systems.
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 Security Foundations
Key term
802.1X
802.1X is a network access control standard that authenticates devices before they are allowed to connect to a wired or wireless network.
Key term
MAC filtering
MAC filtering is a security practice that allows or denies network access to devices based on their unique Media Access Control (MAC) address.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official ISC2 exam blueprint
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