Which statement below is correct regarding VLANs?

A.
A closed VLAN configuration is the least secure VLAN configuration.

B.
A VLAN is less secure when implemented in conjunction with private port switching.

C.
A VLAN is a network segmented physically, not logically.

D.
A VLAN restricts flooding to only those ports included in the
VLAN.

Explanation:
A virtual local area network (VLAN) allows ports on the same or
different switches to be grouped so that traffic is confined to
members of that group only, and restricts broadcast, unicast, and
multicast traffic.
Answer “A VLAN is a network segmented physically, not logically” is incorrect, because a VLAN is
segmented logically, rather than physically.
Answer “A VLAN is less secure when implemented in conjunction with private port switching” is
incorrect.

When a VLAN is implemented with private port, or single-user,
switching, it provides fairly stringent security because broadcast
vulnerabilities are minimized.
Answer “A closed VLAN configuration is the least secure VLAN configuration” is incorrect, as a
closed VLAN authenticates a user to an access control list on a central
authentication server, where they are assigned authorization
parameters to determine their level of network access. Sources:
Catalyst 5000 Series Installation Guide (Cisco Systems) and Virtual
LANs by Mariana Smith (McGraw-Hill, 1998).