poster4 - Chapter 5 Network Layer JonathanC.L.Liu,Ph.D.

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1 Chapter 5 Network Layer Jonathan C.L. Liu, Ph.D. Department of Computer, Information Science and Engineering (CISE), University of Florida
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3 Store-and-Forward Packet Switching The environment of the network layer  protocols. fig 5-1
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4 Implementation of Connectionless Service
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5 Implementation of Connection-Oriented Service
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6 5-4
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10 Shortest Path Routing
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11 Link State Routing Each router must do the following: Discover its neighbors, learn their network  address. Measure the delay or cost to each of its  neighbors. Construct a packet telling all it has just  learned. Send this packet to all other routers. Compute the shortest path to every other  router.
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12 Distance Vector Routing
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13 Distance Vector Routing (2) The count-to-infinity problem.
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14 Hierarchical Routing Hierarchical routing.
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15 Multicast Routing (a) A network. (b) A spanning tree for the leftmost router. (c) A multicast tree for group 1. (d) A multicast tree for group 2.
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16 Routing for Mobile Hosts A WAN to which LANs, MANs, and  wireless cells are attached.
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17 Routing for Mobile Hosts (2) Packet routing for mobile users.
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18 Routing in Ad Hoc Networks Military vehicles on battlefield. No infrastructure . A fleet of ships at sea. All moving all the time Emergency works at earthquake . The infrastructure destroyed . A gathering of people with notebook  computers. In an area lacking 802.11.
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19 Asynchronous Transfer Mode (ATM)
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20 Logical Connections VCC (Virtual Channel Connection): a  logical connection analogous to virtual  circuit in X.25 VPC (Virtual Path Connection): a bundle  of VCCs with same endpoints
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21 Figure 5.2
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22 Advantages of Virtual Paths Simplified network architecture Increased network performance and  reliability Reduced processing and short connection  setup time Enhanced network services
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23 VCC Uses Between end users Between an end user and a network entity Between 2 network entities
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24 VPC/VCC Characteristics Quality of Service (QoS) Switched and semi-permanent virtual  channel connections Cell sequence integrity Traffic parameter negotiation and usage  monitoring (VPC only) virtual channel identifier  restriction within a VPC
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poster4 - Chapter 5 Network Layer JonathanC.L.Liu,Ph.D.

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