1 / 7

Internet Protocol: Connectionless Datagram Delivery

Internet Protocol: Connectionless Datagram Delivery. Chapter 7. Introduction. An internet is an abstraction of physical networks because it provides the same functionality: Accepting packets and delivering them Conceptual layers of internet services. Applications. Reliable Transport Service.

hosea
Download Presentation

Internet Protocol: Connectionless Datagram Delivery

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Internet Protocol:Connectionless Datagram Delivery Chapter 7

  2. Introduction • An internet is an abstraction of physical networks because it provides the same functionality: • Accepting packets and delivering them • Conceptual layers of internet services Applications Reliable Transport Service Connectionless Packet Delivery Service

  3. Connectionless Delivery System • Service is defined as unreliable, best-effort, connectionless packet delivery system • Unreliable because delivery is not guaranteed • the packet may be lost, duplicated, delayed, or delivered out of order • the service will not detect such conditions, nor will it inform the sender or receiver - how will they know? • Connectionless because each packet is treated independently from all others • Best-effort because bad things are not done intentionally

  4. Purpose of the Internet Protocol • IP provides • the basic unit of data transfer used in a TCP/IP internet, and the format of all data • IP software which performs the routing, the path over which data is sent • a set of rules for unreliable packet delivery: how packets are processed, how and when error messages are generated, when packets can be discarded

  5. What is a Datagram? • The basic unit of information passed across a TCP/IP internet IP datagram : internet = frame : physical network • A datagram is separated into header and data areas (like a frame) as shown in Figure 7.2 • The datagram header contains IP addresses • The frame header contains hardware addresses • See Figure 7.3

  6. Summary • IP formally specifies the format of internet packets, called datagrams • The IP datagram header contains • source and destination IP addresses • fragmentation information, precedence, and a checksum for the header • may contain options: • record routing, timestamps

  7. For Next Time • Read Chapter 8 • What else?

More Related