C is correct
D. To uniquely identify a device on the Internet.
The statement in option D is incorrect because a MAC address is not used to uniquely identify a device on the Internet. The MAC address is only used within the local network (LAN) and is not routable over the internet. When data is transmitted over the Internet, it is encapsulated in packets that contain both the source and destination IP addresses, not MAC addresses.
While all devices have an MAC address, each is only used within the Layer 2 broadcast domain to identify where the device is (i.e. the network interface). Anything outside of the L2 broadcast domain (your vlan/network) needs an IP address to route data end to end. In this case, the source and destination IP address within a packet never change, but the MAC address is used to get to the next hop router, then changed to get to the next in line, until it reaches the destination.
C is the correct answer:
Each client that needs to exchange data on an Ethernet network needs to have a unique MAC address so that the data is directed to the proper destination device. The MAC address is burned into the network interface card (NIC) and is also called the burned-in address (BIA) or the physical address of the device.
Jackson Chris; Gooley Jason; Iliesiu Adrian; Malegaonkar Ashutosh. Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide (p. 493). Pearson Education. Edición de Kindle.
For more information, where you all can find out that a MAC address can be duplicated, read the next answer:
https://superuser.com/questions/968340/how-is-uniqueness-of-mac-addresses-enforced
D because the question is not asking about the layer 2 communication, but about the uniqness of the mac addresss.. which will be unique for all internet devices on internet... if that make sense :)
A and B does not make sense.
- The MAC address SHOULD be unique around the world, that covers the internet, even if it is L2, in a L3/L2 network, and we know that the L2 devices will not have contact outside their domain, the MAC should be unique. So this is the reason why I believe the correct answer should be D
D is wrong. MAC address doesn't propagate to the internet and you could have a duplicate MAC address and will not have any issue as long as they are not in the same LAN segment.
Correct answer is C
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