Which of the following descriptions of virtual interfaces is incorrect?

Question

Options

• AMutual access between virtual systems is achieved through virtual interfaces
• BThe link layer and protocol layer of the virtual interface are always UP
• CThe virtual interface of the root system is Virtual-if1
• DThe format of the virtual interface is "Virtual-if+interface number"

• A
  10% (2)
• B
  5% (1)
• C
  81% (17)
• D
  5% (1)

Explanation

Option C is incorrect because the root system's virtual interface is Virtual-if0, not Virtual-if1. Interface numbering starts at 0 for the root/default system; Virtual-if1 and higher are assigned to non-root virtual systems.

Why the distractors are wrong:

• A is correct - virtual interfaces are precisely the mechanism that enables inter-virtual-system communication on the same physical device.
• B is correct - unlike physical interfaces, virtual interfaces have no physical medium dependency, so both the link layer and protocol layer remain persistently UP.
• D is correct - "Virtual-if" followed by an integer is the standard naming format (e.g., Virtual-if0, Virtual-if1, Virtual-if2).

Memory tip: Think of the root system as "ground zero" - it always gets Virtual-if0. Just as root in a filesystem is the starting point (not point 1), the root virtual system starts at interface number 0.

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