FC0-U71 Tech Concepts and Terminology Practice Question
A network technician is troubleshooting a connectivity issue and needs to identify the destination MAC address of a frame. Which TWO of the following are true about MAC addresses? (Select TWO.)
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
✓
They are 48 bits in length
MAC addresses are 48-bit (6 bytes) and commonly represented in hexadecimal. They are assigned by manufacturers and are used at the data link layer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
They are 48 bits in length
Why this is correct
MAC addresses are 48 bits (6 bytes).
- ✗
They are assigned by the operating system
Why it's wrong here
MAC addresses are assigned by the manufacturer.
- ✓
They are typically written as 12 hexadecimal digits
Why this is correct
A 48-bit MAC address is 12 hex digits (e.g., 00:1A:2B:3C:4D:5E).
- ✗
They are represented in octal
Why it's wrong here
MAC addresses are represented in hexadecimal.
- ✗
They are used at the application layer
Why it's wrong here
MAC addresses operate at the data link layer (Layer 2).
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
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