$ORACLE_HOME/bin/adapters

Oracle 8.x

Installed Net8 Tranport Protocols are:
IPC
TCP/IP
BEQueath
SSL
RAW
Installed Net8 Naming Adapters are:
TNSnames.ora
OracleNames
Hostname Installed
Oracle Advanced Security option/Security products are:
Oracle Security Server Authentication Adapter

Oracle 9.2.x

Installed Oracle Net transport protocols are:
IPC
BEQ
TCP/IP
SSL
RAW
Installed Oracle Net naming methods are:
Local Naming (tnsnames.ora)
Oracle Directory Naming
Oracle Host Naming
Oracle Names Server Naming
Installed Oracle Advanced Security options are:

Oracle 10.2.x

Installed Oracle Net transport protocols are:
IPC
BEQ
TCP/IP
SSL
RAW
SDP/IB

Installed Oracle Net naming methods are:
Local Naming (tnsnames.ora)
Oracle Directory Naming
Oracle Host Naming

Installed Oracle Advanced Security options are:
RC4 40-bit encryption
RC4 56-bit encryption
RC4 128-bit encryption
RC4 256-bit encryption
DES40 40-bit encryption
DES 56-bit encryption
3DES 112-bit encryption
3DES 168-bit encryption
AES 128-bit encryption
AES 192-bit encryption
AES 256-bit encryption
MD5 crypto-checksumming
SHA-1 crypto-checksumming
Kerberos v5 authentication
RADIUS authentication