Nchapter 4 network layer pdf

Suppose a tcp message that contains 2048 bytes of data and 20 bytes of tcp header is passed to ip for delivery across two networks of the internet i. Build a simple network using the appropriate media. A top down approach 6th edition jim kurose, keith ross addisonwesley march 2012 network layer41 slides adopted from original ones provided by the textbook authors. Network layer 4 vc implementation a vc consists of. Notice that the bottom layer is identified as the first layer. Network layer 411 virtual circuits call setup, teardown for each call before data can flow each packet carries vc identifier not destination host address every router on sourcedest path maintains state for each passing connection link, router resources bandwidth, buffers may be allocated to vc dedicated resources predictable. Ipv6, mobility instantiation and implementation in the internet overview. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Part of the control communication between the data link layer and the network layer is the establishment. New vc number comes from forwarding table network layer 414. Chapter 4 network layer page has been moved chalmers. Common network layer protocols internet protocol version 4 ipv4 internet protocol version 6 ipv6 legacy network layer protocols novell internetwork packet exchange ipx appletalk connectionless network service clnsdecnet 6.

Network layer 44 network service model rthe network service model defines edgetoedge channel rthe most important abstraction provided by network layer. Wattenhofer 4 8 network layer service models network architecture internet atm atm atm atm service model best effort cbr vbr abr ubr bandwidth none constant rate guaranteed rate guaranteed minimum none loss no yes yes no no order no yes yes yes yes timing no yes yes no no congestion feedback no. Ip is a standard that defines the manner in which the network layers of two hosts interact. A top down approach 6th edition jim kurose, keith ross addisonwesley march 2012 network layer 41 slides adopted from original ones provided by the textbook authors. Network layer silvia giordano ica, epfl the transport layer relies on the services of the network layer, which provides a communication service between hosts. Network layer 4 2 network layer utransport segment from sending to receiving host uon sending side encapsulates segments into datagrams uon receiving side, delivers segments to transport layer unetwork layer protocols in everyhost, router urouter examines header fields in all ip datagrams passing through it network data link physical network. Presentation application session transport network data link physical layer 7 layer 6 layer 5 layer 4 layer 3 layer 2 layer. Network layer 411 ver length 32 bits data variable length, typically a tcp or udp segment 16bit identifier header checksum time to live 32 bit source ip address head. Network layer 47 virtual circuits call setup, teardown for each call beforedata can flow each packet carries vc identifier not destination host address everyrouter on sourcedest path maintains state for each passing connection link, router resources bandwidth, buffers may be allocated to vc sourcetodest path behaves much like telephone. Network layer 4 9 virtual circuits call setup, teardown for each call before data can flow each packet carries vc identifier not destination host address every router on sourcedest path maintains statefor each passing connection link, router resources bandwidth, buffers may be allocated to vc dedicated resources predictable. Network layer 49 atm atm atm vbr abr ubr guaranteed rate guaranteed minimum none yes no no yes yes yes yes no no no congestion yes no chapter 4. Network layer 44 ver length 32 bits data variable length, typically a tcp or udp segment 16bit identifier header checksum time to live 32 bit source ip address head. Picking which output link to use from the given input. New vc number comes from forwarding table network layer 4 14.

Entries in forwarding tables in routers along path packet belonging to vc carries a vc number. Understand principles behind network layer services. Were making these slides freely available to all faculty, students, readers. Explain how the data link layer supports communications across data networks. Network layer 411 datagram networks uno call setup at network layer urouters. There can be several paths to send a packet from a given source to a destination. Network layer supervises hosttohost packet delivery hosts could be separated by several physical networks datalink layer provides nodetonode delivery, transport layer provides processtoprocess delivery major basic network layer duties addressing. The first network has an mtu of 1024b, and the second has an mtu of. Explain how physical layer protocols and services support communications across data networks. Explain the role of the data link layer in supporting communications across data networks. Internet protocol datagram format ipv4 addressing icmp ipv6 4. Chapter 4 the network layer george washington university. Compare media access control techniques and logical. Ip is the standard for routing packets across interconnected networkshence, the name internet.

This characteristic is referred to as the maximum transmission unit mtu. In particular, the network layer moves transportlayer segments from one host to another. How will you routers work together to construct a forwarding table at each router containing an entry for every attached network. The most significant protocol at layer 3 also called the network layer is the internet protocol, or ip. Theyre in powerpoint form so you see the animations. A top down approach 6th edition jim kurose, keith ross addisonwesley march 2012 a note on the use of these ppt slides.

The primary responsibility of network layer is to send packets from the source network to the destination network using a perdetermined routing methods. A top down approach 6th edition if you use these slides e. Network layer 4 4 network layer rtransport segment from sending to receiving host ron sending side encapsulates segments into datagrams ron rcving side, delivers segments to transport layer rnetwork layer protocols in every host, router rrouter examines header fields in all ip datagrams passing through it network data link physical network data. Internet protocol mdatagram format mipv4 addressing micmp mipv6 r4. Chapter 1 introduction to networking and the osi model.

Internet protocol dt f t distance vector hierarchical routing 4. Wattenhofer 43 transport packet from sending to receiving hosts network layer protocols in every host, router three important functions. Ipv6, multicast instantiation, implementation in the internet. Network layer and ip protocol cse 32, winter 2010 instructor. Forwarding is the transfer of a packet from an incoming link to an outgoing link within a single router. It is an encapsulating protocol similar to the way ethernet is an encapsulating protocol. Between two hosts transport segment from sending to receiving host. Network layer 425 switching via memory first generation routers. A top down approach featuring the internet, 2nd edition. Compare media access control techniques and logical topologies used in networks. Network layer 5 virtual circuits call setup, teardown for each call beforedata can flow each packet carries vc identifier not destination host od everyrouter on sourcedest paths maintain the state for each passing connection transportlayer connection only involved two end systems link, router resources bandwidth, buffers may be. Your own interfaces ip addresses the prefixes assigned to your attached networks. Ip addresses are 32 bit long, hierarchical addressing scheme.