The ABCs of Tcp/Ip

by Held; Gilbert

• ISBN13: 9780849314636
• ISBN10: 0849314631
• Edition: 2nd
• Format: Nonspecific Binding
• Copyright: 2002-10-29
• Publisher: Auerbach Public

Summary

The TCP/IP protocol suite is changing dynamically to reflect advances in technology and can be considered to represent the "protocol for the new millenium." The ABCs of TCP/IP reflects these advances and includes new coverage on: Secure Web transactions Practical subnetting examples Security threats and countermeasures IPSec ICMP utilization and threats This comprehensive reference provides professionals with an overview of the TCP/IP suite and details its key components. While many books on the subject focus on the details and minutae of TCP/IP, this book covers applications, methods, concepts, and economics associated with the TCP/IP stack. It illustrates how to leverage investments in TCP/IP and how to economize network operations. The ABCs of TCP/IP examines: the manner by which various protocols and applications operate, addressing issues, security methods, routing, network design constraints, testing methods, troubleshooting, management issues, and emerging applications. It also includes separate chapters focusing on security threats and methods useful for overcoming these threats. About the Author: Gilbert Held is an award-winning author and lecturer. Mr. Held is the author of over 40 books and 400 technical articles covering personal computers and computer communications. Some his recent titles include Building a Wireless Office and The ABCs of IP Addressing, published by Auerbach Publications. Mr. Held can be reached via email at [e-mail].

Table of Contents

Overview	p. 1
Applications	p. 2
Current Applications	p. 2
Electronic Mail	p. 2
File Transfers	p. 4
Remote Terminal Access	p. 7
Web Surfing	p. 7
Emerging Applications	p. 10
Audio and Video Players	p. 10
Voice-over-IP	p. 11
Virtual Private Networking	p. 14
Book Preview	p. 14
The Protocol Suite	p. 15
The Standards Process	p. 15
The Internet Protocol and Related Protocols	p. 16
Transport Layer Protocols	p. 16
Applications and Built-In Diagnostic Tools	p. 16
Routing	p. 17
Security Threats	p. 17
Enhancing Security	p. 17
Emerging Technologies	p. 17
The Protocol Suite	p. 19
The ISO Reference Model	p. 19
OSI Reference Model Layers	p. 20
Data Flow	p. 24
The TCP/IP Protocol Suite	p. 24
The Network Layer	p. 24
The Transport Layer	p. 26
The Application Layer	p. 27
Data Flow and Header Utilization	p. 27
Internet Governing Bodies and the Standards Process	p. 31
Internet Governing Bodies	p. 31
Internet Evolution	p. 32
The IAB and IETF	p. 33
The IANA	p. 34
Request for Comments	p. 34
The Standards Process	p. 35
RFC Details	p. 36
Accessing RFCs	p. 36
Best Current Practice	p. 42
The Internet Protocol and Related Protocols	p. 43
The Internet Protocol	p. 44
Datagrams and Segments	p. 44
Datagrams and Datagram Transmission	p. 44
Routing	p. 45
The IP Header	p. 45
IP Addressing	p. 57
Overview	p. 58
The IP Addressing Scheme	p. 59
Class A Addresses	p. 62
Class B Addresses	p. 63
Class C Addresses	p. 65
Class D Addresses	p. 65
Class E Addresses	p. 67
Dotted Decimal Notation	p. 68
Basic Workstation Configuration	p. 69
Reserved Addresses	p. 73
The WINIPCFG Utility	p. 74
Subnetting	p. 76
Multiple Interface Addresses	p. 82
Address Resolution	p. 84
Ethernet and Token Ring Frame Formats	p. 84
LAN Delivery	p. 85
Address Resolution Operation	p. 85
Proxy ARP	p. 87
RARP	p. 87
ICMP	p. 88
Overview	p. 88
The ICMP Type Field	p. 89
The ICMP Code Field	p. 89
Examining Message Types and Code Field Values	p. 90
ICMP Vulnerabilities	p. 97
The Transport Layer	p. 99
TCP	p. 99
The TCP Header	p. 100
Source and Destination Port Fields	p. 100
Sequence and Acknowledgment Number Fields	p. 107
Hlen Field	p. 108
Code Bits Field	p. 108
Window Field	p. 109
Checksum Field	p. 110
Urgent Pointer Field	p. 110
Options	p. 111
Padding Field	p. 112
Connection Establishment	p. 112
Connection Function Calls	p. 112
The Three-Way Handshake	p. 114
The TCP Window	p. 116
TCP Timers	p. 120
UDP	p. 121
The UDP Header	p. 121
Operation	p. 123
Applications	p. 123
Applications and Built-in Diagnostic Tools	p. 125
The DNS	p. 125
Purpose	p. 126
The Domain Name Structure	p. 126
The Name Resolution Process	p. 129
DNS Records	p. 135
Diagnostic Tools	p. 137
Ping	p. 137
Traceroute	p. 141
PathPing	p. 144
Nslookup	p. 146
Finger	p. 152
Routing and Routing Protocols	p. 155
Network Routing	p. 156
Routing in a Global System	p. 156
Routing Table Update Methods	p. 162
The Routing Information Protocol	p. 162
Illustrative Network	p. 162
Dynamic Table Updates	p. 163
Basic Limitations	p. 166
RIP Versions	p. 167
The Basic RIPv1 Packet	p. 168
RIPv2	p. 170
OSPF	p. 172
Overview	p. 172
Path Metrics	p. 173
The Link State Database	p. 174
Database Update	p. 174
Constructing the Shortest Path	p. 176
Initialization Activity	p. 176
Router Types	p. 178
Message Types	p. 178
Common Message Header	p. 179
Operation	p. 180
Configuring Cisco Routers	p. 181
Configuring RIP	p. 181
Examining RIP Routing Tables	p. 182
Configuring IGRP	p. 182
Configuring OSPF	p. 184
Summary	p. 186
Security Threats	p. 187
Password Cracking	p. 187
Internet Availability	p. 188
Cracking Methods	p. 188
Password Creation Policy	p. 190
File and Print Sharing	p. 192
Enabling	p. 192
Establishing Access Controls	p. 192
Viruses and Worms	p. 193
Types of Viruses	p. 194
Scanning	p. 196
Network Attacks	p. 199
Using Whois	p. 199
Hacker Search Techniques	p. 203
Ping Sweeps	p. 203
Ping Attack	p. 203
Directed Broadcast	p. 205
UDP Echo	p. 205
Buffer Overflows	p. 206
Enhancing Security	p. 207
Router Access Considerations	p. 208
Router Control	p. 208
Direct Cabling	p. 208
Telnet and Web Access	p. 209
Router Access Lists	p. 212
Rationale for Use	p. 212
Types of Access Lists	p. 215
New Capabilities in Access Lists	p. 220
Applying a Named Access List	p. 226
Configuration Principles	p. 227
Limitations	p. 227
Firewalls	p. 228
Installation Location	p. 228
Basic Functions	p. 229
IPSec	p. 232
Protocols	p. 233
Modes	p. 233
AH Header Format	p. 235
ESP Header and Trailer	p. 236
Operations	p. 238
Emerging Technologies	p. 239
Virtual Private Networking	p. 239
Benefits	p. 240
Limitations	p. 242
Other Issues to Consider	p. 244
Setting Up Remote Access Service	p. 245
Mobile IP	p. 247
Overview	p. 249
Operation	p. 249
Voice-over-IP	p. 250
Constraints	p. 251
Networking Configurations	p. 254
IPv6	p. 256
Overview	p. 256
Address Architecture	p. 256
TCP/IP Protocol Reference Numbers
ICMP Type and Code Values	p. 265
Internet Protocol (IP) Protocol Type Field Values	p. 271
Port Numbers	p. 275
Index	p. 309
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