0 introduction - Introduction Dr Shengquan Wang Some slides...

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Introduction Dr. Shengquan Wang Some slides are modified from Computer Networking: A Top Down Approach, 6th edition. Jim Kurose, Keith Ross. Addison-Wesley, March 2012.
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Cool” Internet of Things (IoTs) 2 A Nest Learning Thermostat reporting on energy usage and local weather A 2012 internet refrigerator from LG Digital variable speed-limit sign Source:
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Big” internet servers Google Amazon Facebook Canvas 3
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Q: What is the key difference for a networking system such as Internet in comparison with a single-computer system? A: Networking 4
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Including Network services Network physical structure 5
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Network services Users’ view -- providing services to applications: Web, VoIP, email, games, e-commerce, social nets … Developers’ view -- providing programming interface to applications: allows sending and receiving app programs to “connect” to Internet provides service options, analogous to postal service 6
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Network physical structure 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) 7 Home network Institutional network Mobile network Global ISP Regional ISP
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A closer look at network structure network edge: hosts: clients and servers servers often in data centers 8 access networks, physical media: wired links wireless links network core: interconnected routers network of networks
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Connecting end systems to edge router residential access nets enterprise access nets (school, company) wireless access nets 9
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Residential access networks DSL or cable modem router Ethernet Wi-Fi 10 wireless access point wireless laptops router/ firewall cable modem to/from cable headend Ethernet
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Enterprise access networks typically used in companies, universities … 10 Mbps, 100Mbps, 1Gbps, 10Gbps transmission rates end systems typically connect into Ethernet switch 11 Ethernet switch institutional mail, web servers institutional router institutional link to Internet
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Wireless access networks Wireless LANs: within building (100 ft) 802.11b/g (WiFi): 11, 54 Mbps transmission rate Wide-area wireless provided by cellular operator, 10’s km between 1 and 10 Mbps 3G, 4G 12 to Internet to Internet
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Facts: They are so many network components (millions) in Internet. Q: Given millions of network components, how to connect them together? Analogy: how to build a road system? A: Information highway 13
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Network of networks End systems at network edge connect to Internet via access networks Access networks in turn must be interconnected via network core.
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