What Does MAC Address Mean in 200-301?
Full form: Media Access Control Address
Also known as: Media Access Control Address, hardware address, physical address, burned-in address, BIA
Quick Definition
A 48-bit hardware identifier burned into every network interface card.
Full Definition
A MAC address is a 48-bit (6-byte) hardware address assigned to a network interface card (NIC) by its manufacturer. It is written in hexadecimal, separated by colons or hyphens (e.g., 00:1A:2B:3C:4D:5E). Switches use MAC addresses to forward frames within a local network. The first three bytes identify the manufacturer (OUI) and the last three are unique to the device.
Real-World Example
When SW1 receives a frame from PC1, it records PC1's MAC address against the port it arrived on in its MAC address table, so future frames destined for PC1 are sent only to that port.
Exam Trap — Don't Get Fooled
MAC addresses operate at Layer 2. Routers do not forward frames based on MAC addresses — they strip the Layer 2 header and use the Layer 3 IP address.
Related 200-301 Terms
A Layer 2/3 protocol that maps known IP addresses to unknown MAC addresses.
The set of all devices that receive a Layer 2 broadcast frame.
A network segment where two devices can cause a collision if they transmit simultaneously.
A logical segmentation of a switch network into separate broadcast domains.
Frequently Asked Questions
What does MAC Address mean on the 200-301 exam?
A MAC address is a 48-bit (6-byte) hardware address assigned to a network interface card (NIC) by its manufacturer. It is written in hexadecimal, separated by colons or hyphens (e.g., 00:1A:2B:3C:4D:5E). Switches use MAC addresses to forward frames within a local network. The first three bytes identify the manufacturer (OUI) and the last three are unique to the device.
How does MAC Address appear as a trap on the 200-301?
MAC addresses operate at Layer 2. Routers do not forward frames based on MAC addresses — they strip the Layer 2 header and use the Layer 3 IP address.
Can you give a real-world example of MAC Address?
When SW1 receives a frame from PC1, it records PC1's MAC address against the port it arrived on in its MAC address table, so future frames destined for PC1 are sent only to that port.
How important is MAC Address on the 200-301 exam?
MAC Address falls under the Network Fundamentals domain of the 200-301 exam. Understanding it in context with related terms like arp and broadcast-domain is essential for answering scenario-based questions correctly.