CyberGuard SG570 Instalační příručka Strana 33
- Strana / 44
- Tabulka s obsahem
- KNIHY
- Firewall Tutorial 1
- Acknowledgements 3
- INTRODUCTION 4
- About this tutorial 4
- What is a firewall? 4
- Why do you need them? 4
- Security breaches cost you 5
- Other security measures 6
- Find out what your ISP offers 6
- Basic networking principles 9
- Different firewall scenarios 11
- Simple versus sophisticated 14
- How NAT works 14
- Packet filters 15
- Stateful packet filters 15
- Application proxies 16
- Subnetworks 18
- Subnet masks 18
- DHCP servers 19
- What are ports? 20
- STEP 10: DIY security audit 26
- Online testing facilities 26
- Security audit software 26
- Prepare your test scenario 30
- Run the test 31
- can you browse the web? 37
- Failover/load balancing 40
- Dual WAN ports 41
- Load balancing 41
- GLOSSARY 42
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