Which of the following is a broadcast domain created by a switch?

Which of the following is a broadcast domain created by a switch?

A.
VLAN

B.
MAN

C.
DMZ

D.
VPN

Explanation:
A VLAN is a broadcast domain created by a switch. Each broadcast domain connected to interfaces
of the switch is known as a separate VLAN. A VLAN should be configured when a LAN has lots of
traffic or more than 200 devices. It is also required when groups of users need more security or
when a group of users has the same type of work and needs to be on the same broadcast domain.

Answer D is incorrect. A Virtual Private Network (VPN) is a computer network that is implemented
in an additional software layer (overlay) on top of an existing larger network for the purpose of
creating a private scope of computer communications or providing a secure extension of a private
network into an insecure network such as the Internet.
The links between nodes of a Virtual Private Network are formed over logical connections or virtual
circuits between hosts of the larger network. The Link Layer protocols of the virtual network are said
to be tunneled through the underlying transport network.

Answer C is incorrect. A demilitarized zone (DMZ) is a physical or logical subnetwork that contains
and exposes external services of an organization to a larger network, usually the Internet. The
purpose of a DMZ is to add an additional layer of security to an organization’s Local Area Network
(LAN); an external attacker only has access to equipment in the DMZ, rather than the whole of the
network. Hosts in the DMZ have limited connectivity to specific hosts in the internal network, though
communication with other hosts in the DMZ and to the external network is allowed. This allows
hosts in the DMZ to provide services to both the internal and external networks, while an
intervening firewall controls the traffic between the DMZ servers and the internal network clients. In

a DMZ configuration, most computers on the LAN run behind a firewall connected to a public
network such as the Internet.

Answer B is incorrect. Metropolitan Area Network (MAN) represents a network that connects two
or more LANs in the same geographic area. A network connecting two different buildings or offices
in the same city is an example of a MAN. The LANs involved in a MAN are connected to one another
through high-speed connections such as T1, SONET, SDH, etc. A MAN is a hybrid of a LAN and a
WAN. A WAN provides low to medium speed access, whereas a MAN provides high-speed access.