easyMultiple SelectObjective-mapped
350-401 Practice Question: Which four statements about multicast group…
Which four statements about multicast group addresses and Layer 2 mapping are true? (Choose four.)
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
✓
The multicast MAC address is derived by placing the lower 23 bits of the multicast IP address into the OUI 01-00-5E.
Multicast IP addresses in the 224.0.0.0/4 range map to Layer 2 MAC addresses using the OUI 01-00-5E. The lower 23 bits of the IP address are placed into the last three bytes of the MAC address, with the 24th bit set to 0. This mapping is not unique, so multiple IP addresses can map to the same MAC (e.g., 224.0.0.1 maps to 01-00-5E-00-00-01, and 224.128.0.1 also maps to the same MAC). Statement A is correct because it describes the derivation. Statement B is correct because of the 23-bit mapping. Statement C is correct: 224.0.0.1 maps to 01-00-5E-00-00-01. Statement D is false because 224.0.0.0/24 is the local network control block used for link-local communication and is not routable across the internet. Statement E is correct: 01-00-5E-00-00-05 corresponds to 224.0.0.5 since the low 23 bits (0.0.5) match.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The multicast MAC address is derived by placing the lower 23 bits of the multicast IP address into the OUI 01-00-5E.
Why this is correct
Correct. The multicast MAC address is derived by placing the lower 23 bits of the multicast IP address into the OUI 01-00-5E.
- ✓
Multiple multicast IP addresses can map to the same multicast MAC address.
Why this is correct
Correct. Because only 23 bits of the 28-bit multicast IP address are used, multiple IPs can map to the same MAC.
- ✓
The multicast IP address 224.0.0.1 maps to the MAC address 01-00-5E-00-00-01.
Why this is correct
Correct. 224.0.0.1 has low 23 bits 0.0.1, resulting in MAC 01-00-5E-00-00-01.
- ✗
The multicast IP address range 224.0.0.0/24 is reserved for global scope and can be routed across the internet.
Why it's wrong here
Incorrect. The 224.0.0.0/24 range is reserved for link-local (local network control) multicast traffic and cannot be routed across the internet.
- ✓
The multicast MAC address 01-00-5E-00-00-05 corresponds to the IP address 224.0.0.5.
Why this is correct
Correct. The MAC 01-00-5E-00-00-05 has low 23 bits 0.0.5, which corresponds to IP address 224.0.0.5.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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