OSPF and PDR, can only be called under the layer 3 interface of the device.

Question

Options

• ATRUE
• BFALSE
• C
• D

• A
  7% (2)
• B
  79% (23)
• C
  10% (3)
• D
  3% (1)

Explanation

B is correct because OSPF (and protocols like PIM-DR) are not restricted solely to standard Layer 3 physical interfaces - they can also be enabled on logical and virtual interfaces such as loopback interfaces, VLAN interfaces (SVIs), subinterfaces, and tunnel interfaces. The blanket claim that these protocols can only operate under a "Layer 3 interface" is therefore false.

Why A is wrong: Selecting TRUE would mean accepting an overly narrow restriction that doesn't reflect how modern network operating systems implement routing protocols. Real-world configurations routinely apply OSPF to loopbacks and virtual interfaces, which are not traditional physical Layer 3 interfaces.

Memory tip: Think of the word "only" as a red flag in networking exam questions. OSPF is flexible by design - if you remember that it runs on loopbacks (a common exam example), you'll instantly recall that the "only Layer 3 physical interface" restriction is false.

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