Option A is incorrect, the administrative mode is correctly set -> A trunk will form if either of the interfaces is set to "dynamic desirable," or both are set to "dynamic desirable."
Option B is incorrect, the question clearly states that the problem is with "tagged" packets, native VLAN uses untagged frames.
Option D is incorrect, even if we manually set the port to operate as a trunk, a trunk link will form only if the ports use the same encapsulation protocol (ISL, or DOt1q.)
The operational mode will switch from "static access" to the "static trunk" when both interfaces use the same encapsulation protocol.
as a complement:
switchport mode access: Puts the interface (access port) into permanent nontrunking mode and negotiates to convert the link into a nontrunk link. The interface becomes a nontrunk interface, regardless of whether the neighboring interface is a trunk interface.
ref: https://www.ciscopress.com/articles/article.asp?p=2181837&seqNum=8
The exhibit is from two interfaces configured with non-matching trunking encapsulations, so they are not forming a trunk, as per Operational Mode: static access. In this condition, issuing a switchport mode trunk on both switches as per answer D will just have the effect of blocking the port on SW2 because of inconsistent port type. Change the encapsulation to dot1q on SW2 and the trunk will form.
Just lab it as follows to reproduce the problem.
SW1
interface Fa0/1
switchport trunk encapsulation dot1q
SW2
interface Fa0/1
switchport trunk encapsulation isl
Just can't believe how much time and effort we're putting to figure out how a "thing" that is not the valid configuration anymore. I mean who is using "negotiation" on trunks? If it's going to be a trunk, it's "configured" as trunk. Can't really believe...
C is right
D trunk will come up but spaning tree will block the port , will be no communication between devices behind the switches due to the tagging protocols mismatch
The output shows static access because the trunk has not formed. The only working scenario is C. With D, the port on SW2 will be blocked for inconsistent port type.
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