EE450-U9-NetworkLayer-Nazarian-Spring10

EE450-U9-NetworkLayer-Nazarian-Spring10 - University of...

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Unformatted text preview: University of Southern California University of Southern California Viterbi School of Engineering Viterbi School of Engineering EE450 omputer Networks Computer Networks etwork Layer Network Layer Shahin Nazarian Spring 2010 Position of IPv4 in TCP/IP Protocol Suite The Internet Protocol version 4 ( The Internet Protocol version 4 ( IPv4 IPv4 ) is the delivery ) is the delivery mechanism used by the TCP/IP protocols mechanism used by the TCP/IP protocols n TCP/IP there are different MAC protocols and In TCP/IP, there are different MAC protocols and technologies, i.e., different Physical and Link layers ne approach could have been to create a different One approach could have been to create a different IP for each of those technologies However in TCP/IP there is only one IP protocol; IP does not care about the bottom two layer technologies and protocols and can run over all of hem, e.g., Ethernet, wireless, ATM, FR, T1, Cable, them, e.g., Ethernet, w reless, M, F , , able, or any other MAC protocol or technology Layers 1 and 2 are hidden Shahin Nazarian/EE450/Spring 2010 2 Position of IPv4 in TCP/IP Protocol Suite From the following diagram it can be seen that IP is the centerpiece of TCP/IP model (Simple Mail Simple Mail Transfer Protocol Transfer Protocol) (Trivial File (Trivial File Transfer Protocol Transfer Protocol) (Simple Network (Simple Network Management Protocol Management Protocol) (Bootstrap (Bootstrap Protocol Protocol) (Stream (Stream Control Transport Protocol) Control Transport Protocol) (Reverse ARP) (Internet (Internet Group Group anagement anagement (Internet (Internet Control Control essage essage Management Management Protocol Protocol) Message Message Protocol Protocol) Shahin Nazarian/EE450/Spring 2010 3 Position of IPv4 in TCP/IP Protocol Suite IP is a connectionless protocol, i.e., no connection is set up across the network before transmission IP is hence unreliable, in the sense that there is no guarantee for reliable delivery, error-free delivery, ordered delivery, or even delivery at all! It basically gives no guarantee (its a best effort service) IP layer relies on the Transport layer (only TCP) to take care of these problems n top of the connectionless IP we have connectionless or On top of the connectionless IP, we have connectionless or connection-oriented in Transport layer: UDP is connectionless, TCP is connection-oriented Shahin Nazarian/EE450/Spring 2010 4 Network Layer at Different Nodes Network layer at source is responsible for creating a packet from the data coming from another protocol, such as Transport layer protocol or a routing protocol It is also responsible for checking its routing table to find the routing information, such as the outgoing interface of the packet or the the physical address of the next physical address of the next node node Note that Large packets are fragmented Network layer at destination makes sure the destination address...
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EE450-U9-NetworkLayer-Nazarian-Spring10 - University of...

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