Which of the following virtual devices can be defined without a dedicated physical interface?

Question

Options

• AExternal Virtual Router
• BVirtual System
• CVirtual Switch
• DInternal Virtual Router
• EVirtual System in Bridge Mode

• A
  2% (1)
• C
  91% (43)
• D
  2% (1)
• E
  4% (2)

Explanation

A Virtual Switch is a purely software-defined Layer 2 forwarding construct that can be instantiated and configured without binding to a dedicated physical interface at creation time - it exists as a logical entity until interfaces are optionally assigned later.

Why the distractors are wrong:

• A (External Virtual Router) and D (Internal Virtual Router): Both virtual router types require physical or logical interfaces to be assigned in order to perform routing functions; without interfaces, they have no traffic paths to manage.
• B (Virtual System): A virtual system (vsys) must have dedicated physical interfaces or subinterfaces explicitly assigned to it to segment traffic and operate as a standalone logical firewall.
• E (Virtual System in Bridge Mode): Bridge mode requires physical interfaces on both sides of the bridge - it is inherently interface-dependent to pass Layer 2 traffic transparently.

Memory tip: Think "Switch = Software-only" - of all the virtual device types, only the Virtual Switch is a pure software construct that doesn't demand a physical interface to be defined (unlike routers and virtual systems, which need interfaces to fulfill their routing/segmentation purpose).

No community discussion yet for this question.