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1 UNIVERSITY OF CAGLIARI DIEE - Department of Electrical and Electronic Engineering Infrastrutture ed Applicazioni Avanzate nell Internet Elements of Modern Networking ACK: content taken from Foundations of Modern Networking, SDN, NFV, QoE, IoT, and Cloud, William Stallings, Addison Wesley 1
2 New trends: - data center networking (80% of traffic is internal) - IoT and fog networking
3 Access links: Gbps Backbone links: Gbps
4 Peering
5 Ethernet Predominant wired networking technology Has evolved to support data rates up to 100Gbps Distances from a few meters to tens of kilometers Has become essential for supporting personal computers, workstations, servers, and massive data storage devices in organizations large and small Ethernet in the home (PLC + PoE) Ethernet in the office (with WiFi): several speeds and cables Data centers (in the past InfiniBand/Fiber Channel)) Backplane Ethernet: copper jumper cables up to 100 Gbps Blade servers: server modules housed in a single chassis In WANs: alternative to T1 lines, SDH, and ATM 5
6 Standards IEEE 802 LAN standards committee group is responsible for issuing standards for LANs that are referred to commercially as Ethernet The Ethernet Alliance supports and originates activities that span from incubation of new Ethernet technologies to interoperability testing to demonstrations to education 7
7
8 100-Gbps Ethernet Market drivers for 100-Gbps Ethernet Data center/internet media providers To support the growth of Internet multimedia content and web applications, content providers have been expanding data centers Internet exchanges/isp core routing With the massive amount of traffic flowing through these nodes, these installations are likely to be early adopters of 100-Gbps Ethernet Metro video/service providers Video on demand has been driving a new generation of 10- Gbps Ethernet Enterprise LANs Continuing growth in convergence of voice/video/data and in unified communications is driving up network switch demands 10
9 Top of Rack (ToR)
10 Other rates 25 Gigabit Ethernet Consortium Includes Google and Microsoft Objective: reduce costs per Gbps between the NIC and ToR switch A single-lane 25-Gbps and dual-lane 50 Gbps link Work in progress for 400-Gbps Ethernet standard No timetable is yet in place, 1-Tbps in plan 2.5/5 Gbps: Multirate Gigabit BASE-T (MGBASE-T) MGBASE-T Alliance oversees outside of IEEE Mainly intended to support IEEE ac wireless Gaining acceptance where more than 1 Gbps of throughput is needed (such as to support mobile users in the office environment) 12
11 Enterprise Wi-Fi Approximately half of all enterprise network traffic Two trends Demand has increased with more and more employees preferring to use laptops, tablets, and smartphones to connect to the enterprise network (BYOD) The arrival of Gigabit Wi-Fi Standards IEEE wireless LAN committee develops the protocol and signaling standards The Wi-Fi Alliance creates test suites to clarify interoperability for commercial products that conform to various IEEE standards The term Wi-Fi (wireless fidelity) is used for products certified by the Alliance 13
12 Wi-Fi Data Rates (1997): 2 Mbps a (1999): 54 Mbps b (1999): 11 Mbps n (1999): 600 Mbps g (2003): 54 Mbps ad (2012): 6.76 Gbps ac (2014): 3.2 Gbps 14
13 3G/4G Cellular 3G: provide fairly high-speed wireless communication to support multimedia, data, and video in addition to voice Bandwidth, Data rate, Multirate 4G Ultra-broadband Internet access for a variety of mobile devices, including laptops, smartphones, and tablets High definition mobile TV, mobile video conferencing, and gaming services Designed to maximize bandwidth and throughput while also maximizing spectral efficiency Have the following characteristics: Based on an all-ip packet switched network Support peak data rates Dynamically share and use the network resources to support more simultaneous users per cell Support smooth handovers across heterogeneous networks Support high QoS for next-generation multimedia applications 15
14 5G Cellular Still some years away By 2020 the huge amounts of data traffic generated by tablets and smartphones will be augmented by an equally huge amount of traffic from the Internet of Things (which includes shoes, watches, appliances, cars, thermostats, door locks, and much more) Focus will be on: Building more intelligence into the network Meeting service quality demands by dynamic use of priorities Adaptive network reconfiguration Other network management techniques 16
15 Cloud Computing First became available in the early 2000s Particularly targeted at large enterprises Has spread to small and medium-size businesses and recently to consumers Apple s icloud was launched in 2012 and had 20 million users within a week of the launch Evernote launched in 2008 and approached 100 million users in less than six years In 2014 Google announced that Google Drive had almost a quarter of a billion active users 17
16 Cloud Computing Concepts The National Institute of Standards and Technology (NIST) defines the essential characteristics of cloud computing as: Broad network access Rapid elasticity Measured service On-demand self service Resource pooling Advantages Economies of scale Professional network management Professional security management Security (not always) Cloud networking 18
17 Evolution -> IoT 1 Information technology (IT) PCs, servers, routers, firewalls, and so on, bought as IT devices by enterprise IT people, primarily using wired connectivity Operation technology (OT) Machines/appliances with embedded IT built by non-it companies, such as medical machinery, SCADA, process control, and kiosks, bought as appliances by enterprise OT people and primarily using wired connectivity 2 3 Personal technology Sensor/actuator technology 4 Smartphones, tablets, and ebook readers bought as IT devices by consumers exclusively using wireless connectivity and often multiple forms of wireless connectivity Single-purpose devices bought by consumers, IT, and OT people exclusively using wireless connectivity, generally of a single form, as part of larger systems 19
18 Network Convergence Refers to the merger of previously distinct telephony and information technologies and markets You can think of this convergence in terms of a three-layer model of enterprise communications: Application convergence These are seen by the end users of a business Convergence integrates communications applications with business applications Enterprise services At this level, the manager deals with the information network in terms of the services that must be available to ensure that users can take full advantage of the applications that they use Infrastructure The network and communications infrastructure consists of the communication links, LANs, WANs, and Internet connections available to the enterprise A key aspect of convergence at this level is the ability to carry voice, image, and video over networks that were originally designed to carry data traffic 20
19
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