FC0-U71 Tech Concepts and Terminology Practice Question
A network technician is configuring a device and needs to enter a MAC address. Which of the following is a valid MAC address in hexadecimal notation?
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
✓
3A:4B:5C:6D:7E:8F
MAC addresses are 12 hexadecimal digits (0-9, A-F), typically displayed in pairs separated by colons, e.g., 3A:4B:5C:6D:7E:8F. Option A uses letters beyond F (G, H, I, J, K, L) which are not hex digits. Option B has only 6 digits (AB:CD:EF), which is too few. Option D uses Z, Y, W which are not valid hex digits. Only option C meets the requirements: 12 hex digits using only 0-9 and A-F.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
1G:2H:3I:4J:5K:6L
Why it's wrong here
Contains non-hex characters G, H, I, J, K, L.
- ✗
AB:CD:EF
Why it's wrong here
MAC addresses have 6 pairs (12 hex digits), not 3.
- ✓
3A:4B:5C:6D:7E:8F
Why this is correct
Valid MAC address with hex digits.
- ✗
0X:1Z:2Y:3X:4W:5V
Why it's wrong here
Contains non-hex characters Z, Y, X, W, V.
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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Same concept, more angles
5 more ways this is tested on FC0-U71
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer is configuring a device and needs to enter a MAC address. Which notational system is typically used for MAC addresses?
hard- ✓ A.Hexadecimal
- B.Octal
- C.Decimal
- D.Binary
Why A: MAC addresses are usually represented in hexadecimal (base-16) notation, e.g., 00:1A:2B:3C:4D:5E.
Variation 2. A technician is troubleshooting a network issue and needs to view the MAC address of a device. Which notational system is the MAC address most likely represented in?
medium- A.Octal
- B.Decimal
- C.Binary
- ✓ D.Hexadecimal
Why D: MAC addresses are typically represented in hexadecimal (base-16) format, e.g., 00:1A:2B:3C:4D:5E.
Variation 3. 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.)
medium- ✓ A.They are 48 bits in length
- B.They are assigned by the operating system
- ✓ C.They are typically written as 12 hexadecimal digits
- D.They are represented in octal
- E.They are used at the application layer
Why A: 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.
Variation 4. A technician needs to identify a network interface on a device. Which notational system is most commonly associated with MAC addresses?
easy- ✓ A.Hexadecimal
- B.Binary
- C.Octal
- D.Decimal
Why A: MAC addresses are typically written in hexadecimal (base 16) notation, using digits 0-9 and letters A-F.
Variation 5. A network technician is analyzing a hexadecimal IP address representation. Which TWO of the following are common uses of hexadecimal notation? (Select TWO).
medium- A.It uses digits 0-9 and letters A-F.
- ✓ B.It is used for memory addresses and MAC addresses.
- C.Each hexadecimal digit represents 4 bits.
- D.It is a base-8 system.
- ✓ E.It is used to represent colour codes in HTML.
Why B: In the context of IP address representation, hexadecimal notation is used for memory addresses and MAC addresses (option B) and for HTML color codes (option E). Options A and C, while generally true about hexadecimal, are not specifically about its use in IP address representation. Option D is false because hexadecimal is base-16, not base-8.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 practice question is part of Courseiva's free CompTIA 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 FC0-U71 exam.