考试的时候经常需要穿越PIX，那么必须作影射，多数要涉及到端口，说说常用的 FTP-data                                 TCP 20 FTP                                          TCP21 SSH                                          TCP 22 Telnet                                      TCP 23 DNS                                          TCP 53  UDP 53 DHCP Source                            UDP 68 DHCP Destination                     UDP 67 TFTP                                         UDP 69 HTTP                                         TCP 80 SCEP                                         TCP 80 HTTPS/SSL                                TCP 443  UDP 443 NTP                                           UDP 123 WINS                                         UDP 137 138 139

SNMP                                         UDP 161
SNMP Trap                                 UDP 162