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VLANs and trunking.

 

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Q10. Which is true regarding VLANs?

A. VLAN technology uses VLAN switches (layer 2) which is a substitute for routing technology which uses routers.

B. A VLAN has same collision domain

C. A VLAN has same broadcast domain

D. VLANs are less secure with respect to simple switch or Hub networks.

  Correct Answer: C

 

Explanation:

A VLAN is a group of devices on one or more logically segmented LANs. All devices working on a VLAN will have same broadcast domain. Like routers, switches (Layer 2) have the ability to provide domain broadcast segmentation called a VLAN. Using VLAN technology, you can group switch ports and their connected users into logically defined communities of interest. A VLAN operating on a Catalyst switch limits transmission of unicast, multicast, and broadcast traffic to only the other ports belonging to that VLAN, thereby controlling broadcasts.

The benefits of VLANS include:

1. Easy Administration resulting in reduced administration costs,

2. Increased Security due to broadcast control, if you are using simple hub, you can observe traffic corresponding to any node by simply inserting a Network analyzer.

3. Grouping based on functional requirements irrespective of physical location of nodes,

4. Simplify moves, adds, changes,

5. Distribution of traffic thereby using the network bandwidth more efficiently.

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