If you know what BAUD is, and BPS is, and that they are different, then you may be a geek.
If you know what 300, 1200, 2400, 9600, 19200 means, then you may be a geek.
If you know what Xmodem, Ymodem and Zmodem are, then you may be a geek.
If you know what CRC and checksum are/do, then you may be a geek.