Mobility is a key requirement nowadays. Both within a company (wireless) and externally. A key differentiation that has to be kept in mind is whether the company has control over the device or not, if it is a real BYOD then other measures have to be taken then when the company is owner of the device and the necessary security solutions can be installed.
Wireless access is a key requirement for all networks today. A wireless network has to be secure and the authentication to access specific parts of the network is extremely important. Today, security in a wireless network is often better than the security in a fixed network.
A good remote access solution uses strong authentication and provides access based on the security solutions that are installed and active on the device.