ZyXEL Communications ZyWALL 5 Support Notes page 5

B10. What happens to my original system configurations after a
successful firmware upgrade to ZyNOS v4.01? ....................................261
B11. What's the downgrade procedure of ZyWALL 70 running
ZyNOS v4.01?...........................................................................................261
B12. Can I downgrade a ZyWALL 5 or ZyWALL 35 running ZyNOS
v4.01 back to ZyNOS v3.64 (or below)?.................................................261
C. Turbo Card FAQ............................................................................................261
C01. Can I insert the ZyWALL Turbo Card & wireless card
simultaneously into ZyWALL 5, ZyWALL 35 or ZyWALL 70? ..........261
C02. Except ZyWALL Turbo Card is a must when use AV+IDP service,
what exactly I can get benefit from it?...................................................262
C03. Do I must have a ZyWALL Turbo Card inserted if I upgraded to
ZyNOS v4.01? If not, when must I insert a ZyWALL Turbo Card into
my ZyWALL device? ...............................................................................262
D. Firewall FAQ.................................................................................................262
D01. What is a network firewall? ...........................................................262
D02. What makes ZyWALL secure? .....................................................262
D03. What are the basic types of firewalls?...........................................263
D04. What kind of firewall is the ZyWALL? ........................................263
D05. Why do you need a firewall when your router has packet
filtering and NAT built-in? .....................................................................264
D06. What is Denials of Service (DoS)attack?.......................................264
D07. What is Ping of Death attack? .......................................................264
D08. What is Teardrop attack? ..............................................................264
D09. What is SYN Flood attack? ............................................................265
D10. What is LAND attack? ...................................................................265
D11. What is Brute-force attack? ...........................................................265
D12. What is IP Spoofing attack?...........................................................265
D13. What are the default ACL firewall rules in ZyWALL? ..............265
D14. In ZyWALL, is DMZ behind NAT or not? ..................................266
D15. Can I use both public and private IP addresses on DMZ?..........266
D16. Why does traffic redirect/static/policy route be blocked by
ZyWALL?.................................................................................................266
D17. How can I protect against IP spoofing attacks? ...........................268
E. Security Service licenses FAQ ......................................................................269
E01. What is iCard?.................................................................................269
E02. Where can I buy the iCard and how much does it cost? .............269
E03. How many kinds of iCard does ZyXEL provide? ........................269
All contents copyright (c) 2006 ZyXEL Communications Corporation.
ZyWALL 5 Support Notes
5