The Sony VAIO T 11 SVT1121B2EW has an 802.11a WiFi standard which is better than most comparable spec notebook PCs that have been available for around the same time as it. Most notebook PCs of this spec and age have an 802.11n WiFi standard. This Sony notebook PC also have an 802.11b and 802.11g WiFi standard.
This notebook PC's Wi-Fi standard (802.11a) is in fact the worst Wi-Fi standard amongst all notebook PCs of a comparable age and spec to the VAIO T 11 SVT1121B2EW.
An 802.11n WiFi standard is the best Wi-Fi standard across comparable types of notebook PC.