Exam: 200-301: Cisco Certified Network Associate (CCNA) 0 Likes
For what two purposes does the Ethernet protocol use physical (CCNA 200-301)
For what two purposes does the Ethernet protocol use physical addresses?
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.
Solution
Correct answer: A) to uniquely identify devices at Layer 2 and E) to allow communication between different devices on the same network.
MAC addresses are used to uniquely identify devices on a local network segment, ensuring that data frames are correctly routed to the intended recipient. This is crucial for the operation of Ethernet networks, where devices communicate directly with each other without the need for routing through a central device.
In a LAN, each node is assigned a physical address, also known as a MAC/Ethernet address. This address is unique to each of the nodes on the LAN and is 6 bytes (48 bits) long, which is burned on the Ethernet card (also known as the network interface card). Ethernet is a byte-count protocol. A node on a LAN broadcasts a frame that is heard by all other nodes; only the node whose Ethernet address matches with the DA in the Ethernet frame copies the frame into its buffer.
Category: Network Access