CREST Practitioner Security Analyst (CPSA) Practice

Which type of local area network (LAN) shares total bandwidth among all connected stations?

1. Switched Media LAN

2. Shared Media LAN

3. Wireless LAN

4. IPv4 LAN

The correct answer is: Shared Media LAN

In a local area network (LAN), a shared media LAN is characterized by the fact that all connected devices share a common communication medium, meaning that the total available bandwidth is divided among all stations on the network. This type of network architecture typically utilizes technologies such as coaxial cables or hubs, where each device competes for bandwidth access. Because the capacity is shared, the bandwidth available to each station decreases as more devices are connected. In contrast, a switched media LAN operates differently by using network switches, which connect devices while providing a dedicated point-to-point connection. This results in individual bandwidth allocation to each connection, enhancing performance and reducing competition for resources among devices. Wireless LANs, while they can also share bandwidth, often incorporate techniques to manage access, yet they still generally allow for overlapping connections within a shared medium concept. Finally, the term IPv4 LAN refers to a network using the IPv4 addressing scheme and does not pertain to the mechanics of bandwidth sharing. Therefore, the defining feature of shared media LANs is the collective sharing of bandwidth, making this the correct choice.