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34 votes
34 votes

A host is connected to a Department network which is part of a University network. The University network, in turn, is part of the Internet. The largest network in which the Ethernet address of the host is unique is

  1. the subnet to which the host belongs
  2. the Department network
  3. the University network
  4. the Internet

5 Answers

Best answer
62 votes
62 votes

Answer is D, Ethernet address is nothing but MAC Address which is present on NIC and it is unique for every network device (a single system might have multiple network cards and each can have its own MAC address).

PS: We can never say Ethernet address is unique only in a network -- because it is independent of the network a device is connected to. That is, if we move a device from one network to another, MAC address remains same. Of course we can do spoofing, but this is not relevant to the asked question.

edited by
19 votes
19 votes
The answer should be (D) since a specific LAN technology - Ethernet is mentioned here, so MAC addresses will be specifically taken as physical address which is unique in the entire world.!

If in general LAN Address was mentioned, then we would have had to take Physical Address concept, which only needs to be unique within the network, so answer would have been A in that case.
4 votes
4 votes

Answer is D.

Because the Ethernet address will be unique for every host.

Answer:

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