Telematics Chapter 6: Network Layer - Freie Universität Berlin

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Routing Link State Routing Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer 6.190
Link State Routing ● Every router ● determines its neighbors and their addresses ● HELLO packets ● measures the distances to the neighbors ● ECHO packets ● sends these information in a packet to all other routers ● Link State Advertisement (LSA) ● computes on the basis of all the received LSAs from other routers the shortest paths to the other routers (e.g. with the Dijkstra algorithm) ● This is repeated regularly. Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer 6.191
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Telematics Chapter 6: Network Layer
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Design Issues Connection principles
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Layers in the Network Application P
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Two Fundamental Philosophies ● Co
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Connection-Oriented Communication C
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Routing ● Most important function
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Routing - Connectionless Univ.-Prof
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Routing - Comparison Issue Connecti
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The Optimality Principle A subnet A
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Internet Univ.-Prof. Dr.-Ing. Joche
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On the Way to Today's Internet Stru
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ARPANET A node consists of ● an I
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Evolution by ARPANET Very fast evol
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TCP/IP ● Developed 1974: ● Tran
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From the ARPANET to the Internet
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Evolution of the Internet Univ.-Pro
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Internet ● What does it mean: “
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The classical TCP/IP Protocol Suite
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Internet Protocol (IP) Univ.-Prof.
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Internet Protocol (IP) ● IP: conn
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The IP Header (1) ● Version (4 bi
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Fragmentation ● A too large or to
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Internet Protocol (IP) Addressing U
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IP Addresses 192.168.13.x 192.168.1
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IP Addressing: Examples The represe
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IP Addresses are scarce… ● Prob
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IP Subnets ● Within an IP network
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IP Subnets: Computation of the Dest
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IPv6 Univ.-Prof. Dr.-Ing. Jochen H.
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IPv6 ● Why changing the protocol,
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IPv6: Characteristics ● Address s
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IPv6 Header ● Packet size require
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IPv6 Path MTU Discovery ● Path MT
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IPv6 Extension Headers ● Optional
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IPv6 Extension Headers ● Two exte
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IPv6 Addresses (RFC 4291) ● IPv6
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IPv6 Addresses: Representation of a
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IPv6 Addresses: Representation of a
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IPv6 Addresses: Address Types ● G
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IPv6 Addresses: Address Types ● M
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Transition from IPv4 to IPv6 ● IP
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Transition from IPv4 to IPv6 ● Tr
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Network Address Translation (NAT) U
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Network Address Translation (NAT)
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NAT Variants ● Disadvantages of s
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Problems with NAPT ● NAPT works w
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Auxiliary Protocols ARP, RARP, DHCP
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Auxiliary Protocols ● IP serves o
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Delivery of IP Packets ● Address
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Address Resolution Protocol (ARP) O
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Dynamic Host Configuration Protocol
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Dynamic Host Configuration Protocol
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How to realize Multicast with IPv4?
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Internet Group Management Protocol
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Multicast Groups: Example Network w
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Internet Control Message Protocol (
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ICMP: Header ● ICMP message field
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ICMP: Applications ● Some very po
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Some Tools Univ.-Prof. Dr.-Ing. Joc
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Some Tools: Route ● Route ● Dis
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Some Tools: Traceroute ● Tracerou
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Some Tools: Pathping (2) Computing
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Internet Layer ● Raw division int
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Routing in the Internet ● The Int
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Routing in a Sub-Network ● Sub-ne
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Routing Algorithms: Graph abstracti
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Routing Algorithms: Taxonomy static
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Static Routing ● Source Routing
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Static Routing ● Flooding Princip
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Page 141 and 142: Probabilistic Routing ● Router de
Page 143 and 144: Routing: Shortest Path ● Static v
Page 145 and 146: Shortest Path: Dijkstra (1) ● Alg
Page 147 and 148: Shortest Path: Dijkstra (3) A 2 6 B
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Page 157 and 158: Distance Vector Routing ● Problem
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Page 161 and 162: Distance Vector Routing: Example A
Page 163 and 164: Distance Vector Routing: Example B
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Page 167 and 168: Distance Vector Routing: Example Fr
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Page 171 and 172: Distance Vector Routing: Connection
Page 179 and 180: Distance Vector Routing: The Bounci
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Page 183 and 184: Distance Vector Routing: Count to I
Page 185 and 186: Distance Vector Routing: Count to I
Page 187 and 188: Routing Routing Information Protoco
Page 189: Information Exchange 1.) Exchange o
Page 193 and 194: Link State Routing ● Second step:
Page 195 and 196: Packet Buffer for Router B ● Four
Page 197 and 198: Route Enquiry ● Fifth step: Decis
Page 199 and 200: Routing Tables ● Problem: extensi
Page 201 and 202: Hierarchical Routing Region 1 1A 3A
Page 203 and 204: Open Shortest Path First (OSPF) ●
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Page 207 and 208: Intermediate System to Intermediate
Page 209 and 210: Border Gateway Protocol (BGP) ● G
Page 211 and 212: Size of BGP routing tables (bgp.pot
Page 213 and 214: Average AS path length Univ.-Prof.
Page 215: Summary ● TCP/IP reference model
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Telematics Chapter 6: Network Layer - Freie Universität Berlin

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