Three Correct Statements About MAC Addresses

ADE.

A. To communicate with other devices on a network, a network device must have a unique MAC address

This statement is true. A Media Access Control (MAC) address is a unique identifier assigned to the network interface controller (NIC) of a network device. Every device on a network must have a unique MAC address, which is used by the network to identify and communicate with that device.

D. A MAC address contains two main components, the first of which identifies the manufacturer of the hardware and the second of which uniquely identifies the hardware

This statement is also true. A MAC address is a 48-bit hexadecimal number that is composed of two parts. The first 24 bits identify the manufacturer of the NIC, while the last 24 bits uniquely identify the hardware. This ensures that each device has a globally unique MAC address.

E. An example of a MAC address is 0A:26:B8:D6:65:90

This statement is also true. The MAC address provided is a valid example of a 48-bit MAC address. The first 24 bits (0A:26:B8) identify the manufacturer, while the last 24 bits (D6:65:90) uniquely identify the hardware.

B. The MAC address is also referred to as the IP address

This statement is false. A MAC address and an IP address are two different types of addresses used in computer networks. A MAC address is a unique identifier assigned to the NIC of a network device, while an IP address is a logical address used to identify the network and the host within the network.

C. The MAC address of a device must be configured in the Cisco IOS CLI by a user with administrative privileges

This statement is false. The MAC address is a unique identifier assigned to the NIC by the manufacturer, and it cannot be changed. However, some network devices allow for the MAC address to be changed through software or firmware. In Cisco IOS CLI, the command "mac-address-table" can be used to view the MAC address table of a switch, but it does not allow for the configuration of the MAC address.

F. A MAC address contains two main components, the first of which identifies the network on which the host resides and the second of which uniquely identifies the host on the network.

This statement is false. As mentioned earlier, a MAC address contains two main components: the first 24 bits identify the manufacturer, while the last 24 bits uniquely identify the hardware. The MAC address does not identify the network on which the host resides.