CompTIA Network+ OSI Model Practice Questions: Addressing

5 free, exam-style CompTIA Network+ OSI Model (N10-009) practice questions covering Addressing. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. Which of the answers listed below refers to a unique, 48-bit identifier also known as physical network address?

A.SSID
B.IP
C.GUID
D.MAC✓ Correct

Explanation: A MAC (Media Access Control) address is a unique 48-bit identifier assigned to network interfaces for communications at the data link layer.

Q2. Which OSI layer is responsible for MAC addressing?

A.Data Link layer✓ Correct
B.Network layer
C.Session layer
D.Application layer

Explanation: MAC addressing operates at Layer 2, the Data Link layer.

Q3. Which OSI layer is responsible for IP addressing and routing?

A.Network layer✓ Correct
B.Presentation layer
C.Data Link layer
D.Application layer

Explanation: The Network layer uses logical addresses such as IPv4 and IPv6 to route packets.

Q4. Which OSI layer adds source and destination IP addresses?

A.Network layer✓ Correct
B.Session layer
C.Physical layer
D.Application layer

Explanation: IP addressing is part of Layer 3, the Network layer.

Q5. Which OSI layer adds source and destination MAC addresses?

A.Data Link layer✓ Correct
B.Transport layer
C.Session layer
D.Presentation layer

Explanation: Ethernet source and destination MAC addresses are Layer 2 fields.