HUAWEI Question of the Week 1

Question: Networks Heaven has initially configured all ports of a switch to be the member of VLAN 10. What will be the effect if switch ports are added to a new VLAN i.e., VLAN 12.


A.  An addition collision domain will be created.

B.  More bandwidth will be required that was needed previously.

C.  IP addresses will be wasted by adding a VLAN.

D.  An additional broadcast domain will be created.

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D.  An additional broadcast domain will be created.

Number of collision domains = Number of Ports on a switch
Number of Broadcast domains = Number of Vlans on a switch

VLAN stands for Virtual Local Area Network. It is a technology to break down a single broadcast domain into multiple broadcast domains. This technology divides a Physical LAN into more Logical LANs. VLAN technology is used to solve the problem that switches can’t limit broadcast within the LAN. BY default, all ports are member of VLAN 1 and this is the reason that broadcast message will be received and processed by every port.

A VLAN can be thought of as a broadcast domain.  The broadcast or flooded traffic originated from a particular VLAN will be flooded out ports belonging to that VLAN, including trunk ports. This is why hosts within a VLAN normally communicate while communication cannot be achieved between VLANs directly.