It is uncommon for an organisation to have multiple wireless networks, some even segregated for different users within a small working area. In the past, a wired ethernet connection is mandatory for speed & reliability of the connection. However, with the advancements in wireless networking technology, similar speed & reliability can also be achieved without any compromises. This has enabled a more productive working environment where the employees can move around freely while always being connected to the network.
It is also uncommon for certain wireless network configurations to be overlooked when there are far too many to be maintained. Each and every wireless networking within the organisation needs to be at the same level of high security. An insecure wireless network can easily allow an attacker into the organisational intranet. From there, the attacker can potentially make his way to the other network subnets to conduct their attacks.