ISC2 CC Network Security Practice Question

In the OSI model, which layer uses MAC addresses to forward frames and supports VLANs?

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

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Layer 2 - Data Link

Layer 2 (Data Link) uses MAC addresses and switches; VLANs operate at this layer.

Answer analysis

For each option: why learners choose it and why it is or isn't the right answer here.

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Layer 2 - Data Link
Why this is correct
Correct. MAC addressing, switching, and VLANs are Layer 2 functions.
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Layer 4 - Transport
Why it's wrong here
Transport layer uses ports and handles segments.
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Layer 3 - Network
Why it's wrong here
Network layer uses IP addresses, not MAC addresses.
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Layer 1 - Physical
Why it's wrong here
Physical layer handles bits, not frames or MAC addresses.

Visual reference

Quick reference

Model	Acronym	Who Controls Access?	Best For
Discretionary Access Control	DAC	Resource owner	Small teams, file shares
Mandatory Access Control	MAC	System / security labels	Classified govt / military
Role-Based Access Control	RBAC	Administrator (via roles)	Enterprise environments
Attribute-Based Access Control	ABAC	Policy engine (user + resource attributes)	Fine-grained, dynamic policies
Rule-Based Access Control	RuBAC	System rules / ACLs	Firewall rules, network ACLs

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