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CCNA™ Challenge Question
Implementing a Virtual LAN:
| a) |
decreases security on the network. |
| b) |
simplifies moves, adds, and changes. |
| c) |
groups ports or end-users into a common collision domain. |
| d) |
increases the likelihood of a broadcast storm. |
| e) |
is a technology that operates at Layer 3 of the OSI model. |
Answer
| b) |
simplifies moves, adds, and changes. |
Explanation
A VLAN is a logical grouping of switch ports or end-users that share a broadcast domain that has been defined
at Layer 2. Cisco's position on VLANs is that their deployment simplifies adds, moves, and changes of
end-systems within a network -- specifically in relation to the administration required when an end-user
changes locations within a building or campus environment. VLANs increase security on the network and can
simplify the process of security policy management when implemented properly. The risk of broadcast storms on
a network decreases because of the segmentation function of a VLAN; however, caution must be exercised when
VLAN 1 is permitted access to all trunk links in the network.
For more information on the problems that can occur when VLAN 1 is permitted on all trunk links in a
network, refer to the CertificationZone CCNA VLANs tutorial.
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