Chapter 1 Securing Your Internetwork 1
Introduction to Internetworking Security 2
Why the Change of Heart Toward Network Security? 2
Differentiating Security Models and Attacks 3
Hackers and Attack Types 5
What Do Hackers Do? 5
Attack Types 6
Types of Defenses 8
Education 8
Application Security 8
Physical Security 9
Firewalls, Proxy Servers, and NAT 9
Designing a Site Scenario 11
Ensuring Host Security 13
Characteristics of Network Security 15
Availability 16
Integrity 17
Confidentiality 17
Customizing Access Control 18
Authentication 19
Authorization 20
Accounting 21
Network Communication in TCP/IP 21
Application Layer 23
Transport Layer 23
TCP 23
TCP Connection 25
UDP 26
Internet Layer 27
IP 27
ICMP 27
ARP 28
Network Layer 28
Security in TCP/IP 28
Cryptography 29
Symmetric Cryptography