Refer to the exhibit.
What information about the interfaces on the Main_Campus router is true?
A.
The LAN interfaces are configured on different subnets.
B.
Interface FastEthernet 0/0 is configured as a trunk.
C.
The Layer 2 protocol of interface Serial 0/1 is NOT operational.
D.
The router is a modular router with five FastEthernet interfaces.
E.
Interface FastEthernet 0/0 is administratively deactivated.
Explanation:
Interface fa0/0 breaks into sub-interfaces and Main_Campus router is connected with switch via
fa0/0 .Subinterfaces configured with different subnet mask so the seem switch has multiple vlans
and allows communication between these VLAN’s. For routing and inter-vlan we need to configure a
trunk port. So B will be the correct answer.
I do not understand how A is not a correct answer as well, anyone care to explain?
I think that the question is wrong, but TECHNICALLY speaking, based on the output we do not know exactly what the subnet mask is for each individual subinterface. Theoretically, all four subinterfaces could be located within the same VLAN subnet by using a 255.255.252.0 subnet mask. HOWEVER, if this were the case, why would subinterfaces be configured at all?
I think you are correct. The question is wrong and likely should’ve included a (Choose two)
If for some reason this shows up on the exam the same, know that the only thing that is a definite is that Fa0/0 MUST be a trunk. So which is more true, to assume that the subinterfaces are each in different VLANs or that the Fa0/0 link must be a trunk?
Also, the only other thing that I can think of is that the question refers “lan interfaces” which technically should only reference PHYSICAL interfaces. Remember that subinterfaces are logical interfaces and therefore are not a part of the “LAN segment.”
If this question is correct then this is a dumb trick question. I still think that you are correct in that A should also be an answer.
Also, I do believe that for the purposes of CCNA material, Cisco does not consider serial connections as LAN connections. This could also be their reasoning behind this answer; regardless B is correct because the interface is still a trunk. I believe it may be a poor trick question if they are really not regarding the serial connections as LAN interfaces.