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200-301 · Question #151

Which three statements about MAC addresses are correct? (Choose three)

The correct answer is A. To communicate with other devices on a network, a network device must have a unique MAC D. A MAC address contains two main components, the first of which identifies the manufacturer of E. An example of a MAC address is 0A:26:B8:D6:65:90. MAC addresses are unique identifiers for network devices, consisting of a manufacturer OUI and a unique device ID, typically represented in hexadecimal format.

Submitted by satoshi_tk· Mar 5, 2026Network Fundamentals

Question

Which three statements about MAC addresses are correct? (Choose three)

Options

  • ATo communicate with other devices on a network, a network device must have a unique MAC
  • BThe MAC address is also referred to as the IP address
  • CThe MAC address of a device must be configured in the Cisco IOS CLI by a user with
  • DA MAC address contains two main components, the first of which identifies the manufacturer of
  • EAn example of a MAC address is 0A:26:B8:D6:65:90
  • FA MAC address contains two main components, the first of which identifies the network on which

How the community answered

(46 responses)
  • A
    87% (40)
  • B
    4% (2)
  • C
    2% (1)
  • F
    7% (3)

Why each option

MAC addresses are unique identifiers for network devices, consisting of a manufacturer OUI and a unique device ID, typically represented in hexadecimal format.

ATo communicate with other devices on a network, a network device must have a unique MACCorrect

Each network interface card (NIC) requires a unique MAC address to ensure proper Layer 2 communication and addressing within a local network segment.

BThe MAC address is also referred to as the IP address

The MAC address operates at Layer 2 (Data Link Layer), while the IP address operates at Layer 3 (Network Layer); they are distinct addressing schemes.

CThe MAC address of a device must be configured in the Cisco IOS CLI by a user with

MAC addresses are typically hard-coded into the network interface card (NIC) by the manufacturer and are not generally configured manually via the Cisco IOS CLI.

DA MAC address contains two main components, the first of which identifies the manufacturer ofCorrect

A MAC address is a 48-bit identifier, where the first 24 bits (the Organizationally Unique Identifier or OUI) identify the manufacturer, and the last 24 bits are a unique serial number assigned by that manufacturer.

EAn example of a MAC address is 0A:26:B8:D6:65:90Correct

MAC addresses are conventionally represented as six groups of two hexadecimal digits, separated by colons or hyphens, such as 0A:26:B8:D6:65:90 or 0A-26-B8-D6-65-90.

FA MAC address contains two main components, the first of which identifies the network on which

The second component of a MAC address identifies the specific device, not the network on which it resides; the network is identified by the IP addressing scheme.

Concept tested: MAC address structure, uniqueness, and representation

Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/network-interface-card/mac-address-overview

Topics

#MAC addresses#Ethernet addressing#Data Link Layer

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