The Internet Protocols

1
The Internet Protocols

• COMT 539

2
Protocol Overview
E-Mail HTTP (WWW) Remote
Login File Transfer
TCP UDP
IP ICMP ARP RARP
(Auxiliary Services)
X.25 Packet Layer
Ethernet, X.25, HDLC etc.
3
Network Hierarchy
Backbone
Gateway
4
Connection Types in TCP/IP
Transport Layer
TCP Connection Oriented UDP Connection-less
Connection-less
Network Layer
Data Link Layer and Physical Network
Depends on the network
5
IP Header
Version
Header Len
Class of Service
Total Length
Identification
D
M
Fragment Position
Timeout
Protocol
Header Checksum
Source Address
Destination Address
6
UDP Header
Source Port
Destination Port
Length
Checksum
7
TCP Header
Source Port
Destination Port
Sequence Number
Acknowledgement Number
Window (flow cntrl)
misc Flags
Checksum
Urgent
Options
8
IP Addresses are 32 bits long, originally using
one of three formats
9
Address Notation

• Dotted Decimal
• 192.149.89.61/24 1100 0000 1001 0101 0101
  1001 0011 1101 C0 95
  59 3D
• 132.235.75.17/24
• The Network
• 192.149.89.0
• Broadcast on that network
• 192.149.89.255