Refer to the exhibit. The trunk between Gig1/0/1 of switch SW2 and Gig1/0/1 of switch SW1 is not operational. Which action resolves this issue?

Question

Exhibits

Options

• AConfigure both interfaces to nonegotiate and ensure that the switches are in different VTP
• BConfigure both interfaces in dynamic auto DTP mode and ensure that the switches are in the
• CConfigure both interfaces in dynamic auto DTP mode and ensure that the switches are in different
• DConfigure both interfaces in dynamic desirable DTP mode and ensure that the switches are in the

• A
  4% (2)
• B
  16% (8)
• C
  10% (5)
• D
  70% (35)

Explanation

Explanation

Option D is correct because when both interfaces are set to dynamic desirable, each switch actively attempts to negotiate a trunk link, meaning at least one side is initiating the trunk formation - this satisfies the DTP negotiation requirement. Both switches must also be in the same VTP domain (or have one switch with a null VTP domain) for the trunk to successfully form.

Why the distractors are wrong:

• Option A (nonegotiate) fails because setting both sides to nonegotiate disables DTP entirely, meaning neither side will actively form a trunk - you would need to manually set both ports to static trunk mode (switchport mode trunk) for this to work.
• Option B & C (both dynamic auto) fail because dynamic auto is a passive mode - it waits for the other side to initiate negotiation. When both sides are passive, neither initiates, so no trunk is formed.

Memory Tip: Think of "desirable = desires a trunk" - it actively reaches out. Two "auto" (passive) ports are like two shy people waiting for the other to say hello - nothing happens! At least one side must want to initiate. Also remember: same VTP domain = trunk compatibility.

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