Final answer:
The network the user is connected to is most likely operating on the 802.11b standard, as it has a maximum speed of 11 Mbps and their WLAN card is limited to that speed despite being capable of more.
Step-by-step explanation:
If a user with a 802.11n WLAN card is only able to connect at 11 Mbps with full signal strength, the standard implemented on the network is most likely 802.11b. The 802.11b standard has a maximum throughput of 11 Mbps, which matches the speed that the user is experiencing. While the 802.11n card is capable of higher speeds, the network speed will be limited by the slowest part of the network, in this case, the router operating on the older 802.11b standard.