Broader Perspective

1
Broader Perspective

• A Multiprotocol World

2
Other TCP/IP-IP Standards

• Even if you use TCP/IP-OSI, you will not always
  use HTTP, TCP, and IP at the top layers
• There are any other TCP/IP protocols for the
  application, transport, and internet layers
• Application layer protocols for e-mail, etc.
• Also multiple transport and internet layer
  protocols not always TCP and IP

3
Other TCP/IP-IP Standards

• Even if you use TCP/IP-OSI, you will not always
  use PPP and modems at the data link and physical
  layers
• Many other subnet standards
• Ethernet and other subnet standards for LANs
• Many WAN standards

4
Other TCP/IP-IP Standards

• Viewing TCP/IP broadly
• Each layer, in other words, can use any of
  several TCP/IP-OSI protocols
• Dont confuse the standards of webserver access
  from home using a telephone line and modem (HTTP,
  TCP, IP, PPP, and serial ports, modems, etc.)
  with TCP/IP-OSI standards in general

5
You Will Not Always Use TCP/IP-OSI Standards

• You almost always will use OSI standards for the
  data link and the physical layers
• However, at higher layers, you may use Non-TCP
  protocols
• IPX/SPX in some Novell NetWare file servers
• SNA for mainframes
• AppleTalk for Macintoshes
• NetBEUI for servers on some small LANs

6
Living in a Multiprotocol World

• There are many standards architectures
• Each has different layering
• Each has multiple standards at each layer
• This book will focus on TCP/IP-OSI and some
  specific TCP/IP-OSI standards only because not
  all standards can be covered
• We live in a multiprotocol world