LPIC-1 System Architecture Practice Question
Which hardware component uses a unique address to identify itself on the network at the data link layer?
⚠ Common exam trap
A common mix-up: candidates confuse the MAC address with the IP address because both are used for network identification, but the question specifically asks for the data link layer, where only the MAC address (not the IP address) operates.
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
✓
MAC address
The MAC address (Media Access Control) is a unique 48-bit identifier burned into the network interface controller (NIC) by the manufacturer. It operates at Layer 2 (data link layer) of the OSI model, enabling devices on the same local network segment to communicate directly using protocols like Ethernet or Wi-Fi.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IP address
Why it's wrong here
IP addresses operate at the network layer.
- ✓
MAC address
Why this is correct
MAC addresses are used for communication within a local network segment.
- ✗
Hostname
Why it's wrong here
Hostnames are resolved by DNS, not data link layer.
- ✗
Port number
Why it's wrong here
Port numbers operate at the transport layer.
Quick reference
Access Control Model Comparison
| 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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.