Zyxel N4100 - Manual (Page 9)

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If your ISP gave you a user name, password and IP address(es),
select
PPTP .
2. Enter a unique name (up to 32 printable 7-bit ASCII characters) as
the ESSID to identify the N4100 in the wireless LAN.
Select a channel (range of radio frequencies) that is not being used
by other wireless devices in the area.
Select a security type and enter a key for data encryption. If you set
Security to Disabled, any one within range can access your network
wirelessly.
WPA or WPA2 provides user authentication and data encryption.
Data encryption of WPA or WPA2 is stronger than WEP's. The pre-
shared key is case-sensitive ASCII characters (including spaces and