EE450-U9-NetworkLayer-Nazarian-Summer11_1

EE450-U9-NetworkLayer-Nazarian-Summer11_1 - EE450 Computer...

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EE450 Computer Networks Network Layer Shahin Nazarian Summer 2011
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Shahin Nazarian/EE450/Summer 2011 Position of IPv4 in TCP/IP Protocol Suite 2
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Shahin Nazarian/EE450/Summer 2011 Position of IPv4 in TCP/IP Protocol Suite 3 (Reverse ARP) From the following diagram it can be seen that IP is the centerpiece of TCP/IP model
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Shahin Nazarian/EE450/Summer 2011 Position of IPv4 in TCP/IP Protocol Suite IP is a connection_______ 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 (it’s a best effort service) 4
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Shahin Nazarian/EE450/Summer 2011 Position of IPv4 (Cont.) IP layer relies on the Transport layer (only TCP) to take care of these problems On top of the connectionless IP, we have connectionless or connection-oriented in Transport layer: _____ is connectionless, _____ is connection-oriented 5
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Shahin Nazarian/EE450/Summer 2011 Network Layer at Source 6
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Shahin Nazarian/EE450/Summer 2011 Network Layer at Destination Network layer at destination makes sure the destination address on the packet is the same as the host address. If the packet is a fragment, it waits until all fragments have arrived, and then _________ them and delivers the reassembled packet to the ____________ layer What is the main difference between source’s and destination’s Network layer? There is no routing table consultation at ___________; both source and router consult with the routing table to find the next hop 7
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Shahin Nazarian/EE450/Summer 2011 Network Layer at Routers The Network layer at a router or L3 switch is responsible for routing the packet; when the packet arrives at the router or L3 switch it consults its routing table and finds the interface from which the packet must be sent The packet after some changes in the header (routing information updated) is passed to the Data Link layer again 8
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Packet format 9
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Packet format 10
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Service Type 11
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Time to Live (TTL) 12
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Protocol Bits Question: Eventually if the packet reaches destination, is the packet delivery a complete delivery? ___, it ____complete, because the ultimate destination is the application. Packet responsibility is delivery to the IP layer 13
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Protocol Bits (Cont.) 14
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Shahin Nazarian/EE450/Summer 2011 IPv4 – Checksum 15
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Shahin Nazarian/EE450/Summer 2011 Checksum Basics 16
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Shahin Nazarian/EE450/Summer 2011 Checksum – Wrapping 17
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Shahin Nazarian/EE450/Summer 2011 Checksum Using 1’s Complement 18
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Shahin Nazarian/EE450/Summer 2011 Checksum Using 1’s Complement 19 1 1 1 0
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Internet Checksum 20
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This note was uploaded on 08/27/2011 for the course EE 450 taught by Professor Zahid during the Summer '06 term at USC.

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EE450-U9-NetworkLayer-Nazarian-Summer11_1 - EE450 Computer...

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