TCP-IP - Networking - Lecture Slides, Slides of Computer Networks

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Overview of TCP/IP

Reference

• Highly Recommended:
  • TCP/IP White Paper by Microsoft

Chapter Modules

• TCP/IP Overview and Layers
• TCP/IP Related Protocols
• TCP/IP Ports and Windows API

MODULE 1

Overview of TCP/IP

Layers of TCP/IP Reference Model

• There are four layers of the TCP/IP reference model

(DARPA model as named by the US Government

Agency)

• The ISO-OSI reference model is composed of seven layers
• The next slide shows the mapping of the ISO/OSI

model to the TCP/IP model

• Note that the ISO/OSI model is more widely used

and accepted

ISO-OSI Seven Layer Model Recalled

Layer 7 Application Layer 6 Presentation Layer 5 Session Layer 4 Transport Layer 3 Network Layer 2 Data Link Layer 1 Physical Source: http://starter.sdsu.edu/remote/demo/osi-tcp.html

Layer Reference to Protocol Recalled

Application Application FTP, Telnet, SMTP, HTTP.. Presentation Session Transport Host-to-Host TCP, UDP Network Internet IP, ICMP Data Link (^) Network Access Ethernet, Token-Ring ... Physical Source: http://starter.sdsu.edu/remote/demo/osi-tcp.htmldocsity.com

Source: TCP/IP White Paper by Microsoft

Layer Properties

• In the following slides, the following is described for each layer
  • Layer function
  • Core protocols
  • Relationship to ISO/OSI model

Network Interface Layer

• Responsible for sending and receiving TCP/IP

packets on the network medium (physical)

• Applicable LAN technologies
  • Ethernet, Token Ring, FDDI etc.
• Applicable WAN technologies
  • X.25 (old), Frame Relay, ATM etc.
• Note that some technologies such as ATM and FDDI

may be used at both the WAN and the LAN levels

Relationship to OSI Model

Data Link Layer Physical Layer Network Interface Layer

Internet Layer

• Packaging
• Addressing
• Routing

More on Address Resolution Protocol (ARP)

NIC ID

AA.BB.CC.DD

NIC ID

AB.BD.CD.DE

Resolves, for example, IP addresses to the corresponding MAC level hardware address by for instance broadcasting.

IP

HAW

Relationship to ISO Model

Network Layer Internet Layer