What is required to route transit traffic in the Southbound hub?

Question

Options

• ANothing
• BPeering
• CVTI (VPN Tunnel Interface)
• DUser Defined Routes

• B
  4% (1)
• C
  93% (26)
• D
  4% (1)

Explanation

VTI (VPN Tunnel Interface) is required because it enables the hub to act as a transit point by creating a routable logical interface over the VPN tunnel - without it, the hub cannot forward traffic between connected spokes or branches. Option A is wrong because transit routing does not happen automatically; explicit configuration is needed for the hub to pass traffic it did not originate. Option B (Peering) is incorrect because peering connects networks at the same level and does not enable transit forwarding through a hub. Option D (UDRs) can influence where traffic goes after routing decisions are made, but they cannot substitute for the VTI that makes the tunnel interface routable in the first place.

Memory tip: Think "VTI = Virtual Transit Interface" - the word transit is literally baked into the name, reminding you it's the mechanism that lets traffic pass through the hub.

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