200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ1199

Network Fundamentals

For which two purposes does the Ethernet protocol use physical addresses?

Choose two
  • A to uniquely identify devices at Layer 2
  • B to allow communication with devices on a different network
  • C to differentiate a Layer 2 frame from a Layer 3 packet
  • D to establish a priority system to determine which device gets to transmit first
  • E to allow communication between different devices on the same network
  • F to allow detection of a remote device when its physical address is unknown
Explanation

Ethernet physical addresses, meaning MAC addresses, are Layer 2 identifiers assigned to network interfaces so devices on a local Ethernet network can be uniquely identified and frames can be delivered to the correct device on the same network segment. They do not provide communication across different networks, which is the role of Layer 3 logical addressing and routing.

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