What address uniquely identifies a system in an Ethernet network?

Correct option is B

In an Ethernet network, each device is uniquely identified by its MAC (Media Access Control) address, which is a hardware address assigned to the network interface card (NIC). It is a 48-bit address expressed in hexadecimal format.
Important Key Points:
1. The MAC address operates at the data link layer (Layer 2) of the OSI model.
2. It is a globally unique address assigned by the manufacturer and cannot be changed under normal conditions.
3. Ethernet frames use MAC addresses for source and destination identification within a local area network (LAN).
Knowledge Booster:
· IP Address: Identifies devices at the network layer for communication across different networks.
· Subnet Mask: Used for dividing an IP network into smaller subnets.
· Hostname: A human-readable name assigned to a device, not a hardware address.