Question

What is the primary function of the MAC address?

• A. Identify devices on a network locally
• B. Define network topology
• C. Provide internet access
• D. Encrypt network traffic

Hint:

MAC addresses are for local delivery (like a person's name in a room), while IP addresses are for global delivery (like a full postal address). A router needs to know both to deliver a packet from the internet to your specific computer.

Answer 1

The Correct Option is A

A MAC (Media Access Control) address is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment.
It operates at the Data Link Layer (Layer 2) of the OSI model.
Its primary function is to provide a unique hardware address for a device on a local network (like an Ethernet or Wi-Fi network). When a switch forwards a frame, it uses the destination MAC address to send it to the correct physical port.
Let's analyze the options:
(A) Identify devices on a network locally: This is the correct primary function.
(B) Define network topology: Topology is the physical or logical arrangement of a network, not defined by MAC addresses.
(C) Provide internet access: This is managed by higher-level protocols and devices like routers using IP addresses.
(D) Encrypt network traffic: Encryption is handled by protocols at higher layers (e.g., SSL/TLS at the Session/Transport Layer or IPsec at the Network Layer).