RSC Part I: Introduction
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1 RSC Part I: Introduction Redes y Servicios de Comunicaciones Universidad Carlos III de Madrid These slides are, mainly, part of the companion slides to the book Computer Networking: A Top Down Approach generously made available by their authors (see copyright below). The slides have been adapted, where required, to the teaching needs of the subject above. All material copyright J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 5 th edition. Jim Kurose, Keith Ross Addison-Wesley, April RSC Part I: Introduction Circuit switching vs packet switching Protocols and protocols stacks What is the Internet Network structure s and Internet Backbones Introduction 1-2 1
2 What s the Internet: nuts and bolts view PC server wireless laptop cellular handheld router access points wired links millions of connected computing devices: hosts = end systems running network apps communication links fiber, copper, radio, satellite transmission rate = bandwidth routers: forward packets (chunks of data) Mobile network Home network Global Regional Institutional network Introduction 1-3 What s the Internet: nuts and bolts view protocols control sending, receiving of msgs e.g., TCP, IP, HTTP, Skype, Ethernet Internet: network of networks loosely hierarchical public Internet versus private intranet Internet standards RFC: Request for comments IETF: Internet Engineering Task Force Mobile network Global Home network Regional Institutional network Introduction 1-4 2
3 What s the Internet: a service view communication infrastructure enables distributed applications: Web, VoIP, , games, e-commerce, file sharing communication services provided to apps: reliable data delivery from source to destination best effort (unreliable) data delivery Introduction 1-5 A closer look at network structure: network edge: applications and hosts access networks, physical media: wired, wireless communication links network core: interconnected routers network of networks Introduction 1-6 3
4 The network edge: end systems (hosts): run application programs e.g. Web, at edge of network client/server model peer-peer client host requests, receives service from always-on server client/server e.g. Web browser/server; client/server peer-peer model: minimal (or no) use of dedicated servers e.g. Skype, BitTorrent Introduction 1-7 Access networks and physical media Q: How to connect end systems to edge router? residential access nets institutional access networks (school, company) mobile access networks Keep in mind: bandwidth (bits per second) of access network? shared or dedicated? Introduction 1-8 4
5 Home networks Typical home network components: DSL or cable modem router/firewall/nat Ethernet wireless access point to/from cable headend cable modem router/ firewall Ethernet wireless access point wireless laptops Introduction 1-9 Internet structure: network of networks Introduction
6 Internet structure: network of networks roughly hierarchical at center: tier-1 s (e.g., Verizon, Sprint, AT&T, Cable and Wireless), national/international coverage treat each other as equals Tier-1 providers interconnect (peer) privately Tier 1 Tier 1 Tier 1 Introduction 1-11 Tier-1 : e.g., Sprint POP: point-of-presence to/from backbone peering. to/from customers Introduction
7 Internet structure: network of networks Tier-2 s: smaller (often regional) s Connect to one or more tier-1 s, possibly other tier-2 s Tier-2 pays tier-1 for connectivity to rest of Internet tier-2 is customer of tier-1 provider Tier-2 Tier-2 Tier 1 Tier 1 Tier 1 Tier-2 s also peer privately with each other. Tier-2 Tier-2 Tier-2 Introduction 1-13 Internet structure: network of networks Tier-3 s and s last hop ( access ) network (closest to end systems) Local and tier- 3 s are customers of higher tier s connecting them to rest of Internet Tier 3 Tier 1 Tier-2 Tier-2 Tier 1 Tier-2 Tier 1 Tier-2 Tier-2 Introduction
8 Internet structure: network of networks a packet passes through many networks! Tier 3 Tier-2 Tier 1 Tier-2 Tier 1 Tier-2 Tier 1 Tier-2 Tier-2 Introduction
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