Exam 200-301 topic 1 question 46 discussion

Physical address is MAC address

A & E are correct

important to identify devices in layer 2, and for the purpose of communicating

A. to uniquely identify devices at Layer 2 E. to allow communication between different devices on the same network are correct

A,E is correct

how shall i know what i need to choose 2 answers?

Specify that we need to choose 2, thank you

Ref: Ethernet Address - an overview | ScienceDirect Topics “… Transmission Control Protocol/Internet Protocol Packet Analysis … 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. …”

Are correct

A and E are correct but the question doesn't specify "Select two answers" A. to uniquely identify devices at Layer 2 - This is the most Accurate answer E. to allow communication between different devices on the same network - This is OK, but physical addresses is just the FIRST thing needed, not the ONLY thing needed to allow communication in the same broadcast network. So if the question does not specify "select two answers" I would go with A.

I think (F) is incorrect, because remote device means it belongs to other network, please correct me if someone knows thank you

F is not correct. F states that when physical address (MAC address) is not known, it use broadcast address of all Fs. Correct answers are AE as MAC addr are used on L2 and used for communication within the network (LAN).

AF is also correct. In a way, this Q has 3 answers: AEF