The ThinkPad Edge E431 has a better Wi-Fi standard than most laptops that were released more than two years ago. This portable PC has an 802.11n WiFi standard, whereas most similar spec notebook PCs that were released more than two years ago have an 802.11b WiFi standard. This Lenovo laptop also has an 802.11g WiFi standard.
This portable PC's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard amongst all laptops that have been available for a similar time to the ThinkPad Edge E431.
An 802.11a WiFi standard is the worst Wi-Fi standard amongst comparable types of portable PC.