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Systems II 1. Organization, literature, Internet, TCP / IP layer model, ISO / OSI layers Christian Schindelhauer Technical Faculty Computer Networks and Telematics Albert Ludwigs University Freiburg 1 Figure 1. Cisco forecasts 6.3 exabytes per month of mobile data traffic by 2015 Internet Verkehr Western Europe and Asia Pacific will account for over half of global mobile traffic by 2015, as Middle East and Africa will experience the highest CAGR of 129 percent, increasing 63-fold ov The emerging market regions (Central and Eastern Europe, Latin America, and Middle East an highest growth and will represent an increasing share of total mobile data traffic, from 12 perce to 20 percent by 2015. 2 Increase in Internet traffic 1 Ebit / s 100 Pbit / s Cisco: 966 Exabyte / y 2015 Internet traffic 10 Pbit / s 1 Pbit / s 100 Tbit / s 10 Tbit / s 1 Tbit / s 100 Gbit / s 10 Gbit / s 1 Gbit / s 100 Mbit / s 10 Mbit / s 1 Mbit / s 1990 1995 2000 2005 2010 2015 2020 3 The last mile 1 Tbit / s 100 Gbit Ethernet 100 Gbit / s 1 0 Gbit Ethernet 10 Gbit / s 1 Gbit / s Gbit Ethernet 4G LTE Euro-DOCSIS 3 Coax 100 Mbit Ethernet 100 Mbit / s 10 Mbit Ethernet 10 Mbit / s DOCSIS DSL 16000 HSDPA DSL 3000 UMTS 1 Mbit / s DSL 1000 EDGE ISDN 100 kbit / s 56 k Modem GPRS 10 kbit / s 1985 1990 1995 2000 2005 2010 2015 4 2020 Organization & sect;  Web page - http://cone.informatik.uni-freiburg.de/cone_teach/ cone_teach_current / systeme-II- ss2012 & sect;  Forum - http://archive.cone.informatik.uni-freiburg.de/forum3/ viewforum.php? f = 9 & sect;  Lectures - Tuesday, 10:00 - 12:00 ct, lecture hall 101-00-036 - Wednesday, 14:00 - 15:00 ct, lecture hall 101-00-036 5 exercises & sect;  HIS classification is valid - the group size was adjusted to the number of participants adjusted - Please update the assignment assignment - If the Wednesday appointment does not work • enter it in the forum thread & sect;  Group 1 Christian Sch & ouml; nwei & szlig; - Wednesday, 3 p.m. - 4 p.m., seminar room 051 - 00-006 & sect;  Group 2 Felix Thein - Wednesday, 3 p.m. - 4 p.m., seminar room 051 - 00-031 & sect;  Group 3 Jan Alexander - Wednesday, 3 p.m. - 4 p.m., seminar room 078 - 00-014 & sect;  Group 4 Wael AlSidawi - Wednesday, 3 p.m. - 4 p.m., lecture hall 051 - 03-026 6 exercises & sect ;  Appears every Wednesday on the website - processing voluntary - submission as PDF by Tuesday 11.59 p.m. (GMT + 1) of the following week - now enter in the HIS (deadline today) - via web interface • https: // hondo. informatik.uni-freiburg.de:13241/websys/websys? startup = student & amp; lecture = systemeiisommer2012 - basis for written exam & sect;  discussion on the day after submission & sect;  correction by the tutor - return one week after submission & sect;  pre-calculation of the tasks - by the students 7 peers -Review & sect;  Peer-Review procedure for the evaluation of the exercise - Each participant who would like to use his exercise in the exam must review five other submissions - Double-blind review: • No name or matriculation number on the exercise sheet - Submission and evaluation via web interface 8 Examination & sect;  Exam - Written on 04.09.2012, 10.00 am & sect;  Exam registration - takes place online via the HIS & sect;  Note deadlines! & sect;  Permitted resources - none except a selection of your own exercise submissions - these are provided in printed form for the exam • without corrections by the tutors • no program listings • only meaningful submissions • no plagiarized submissions 9 Media & sect;  PDF slides & auml; tze - before the lecture on the website & sect;  Record of previous years & sect;  Bibliography - same and on the website & sect;  Forum - on the website - for discussion - other organization & sect;  Best & Uuml ; Exercise submission on the website 10 Contents 1. Layer models 2. Multimedia 3. Security 4. The Internet 5. Application layer 6. Transport layer 7. Network layer 8. Medium access control Sub-Layer - MAC) 9th Security Layer (Data Link Layer) 10th Bit Transmission Layer (Physical Layer) 11 events in the area of ​​Networks Networks I = Systems II Every summer introduction to networks Ethernet Basics of the Internet Networks II = Communication Systems every winter WLAN, telephone networks, VoIP, etc. Specialization in networks e.g. Distributed Systems Summer / Winter Internships, projects, team projects e.g. Bachelor / Master seminars Network Algorithms Peer-to-Peer Networks Algorithms for Radio Networks Ad-Hoc Networks Wireless Sensor Networks Location-based service every winter depending on the chair, individually Research-related work every semester 12 Literature (II) & sect;  Book No. 1 for the lecture: - Computer Networking A Top-Down Approach Featuring the Internet, James F. Kurose, Keith W. Ross, Prentice Hall 13 Literature (I) & sect ;  Book No. 2 for the lecture - Computer Networks, Andrew S. Tanenbaum (Prentice Hall) - in German: Computeretzwerke (Taschenbuch) 14 Literature (III) & sect;  Book No. 3: - Data and computer Communications - William Stallings - Pearsons, PrenticeHall, 2007 15 Literature (IV) & ​​sect;  For more detailed information: - TCP / IP Illustrated, Volume - The Protocols, W. Richard Stevens, Addison-Wesley 16 Literature (V) & sect;  Fred Halsal, Data Communications, Computer Networ ks and Open Systems, Addison-Wesley, 1995 17 The stratification of the Internet - TCP / IPLayer Application Application Telnet, FTP, HTTP, SMTP (E-Mail), ... TCP (Transmission Control Protocol) Transport Transport UDP (User Datagram Protocol ) Network IP (Internet Protocol) + ICMP (Internet Control Message Protocol) + IGMP (Internet Group Management Protocol) connection Host-toNetwork LAN (e.g. Ethernet, Token Ring etc.) 18 TCP / IP layer model 1. Host-to-Network - not specified, depends on the LAN, e.g. Ethernet, WLAN 802.11b, PPP, DSL Ver 2. Network layer (IP - Internet Protocol) - Special packet format and protocol - Packet forwarding - Route determination & sect;  3rd transport layer - TCP (Transport Control Protocol) • Reliable bidirectional byte stream transmission service • Fragmentation, flow control, multiplexing - UDP (User Datagram Protocol) • Packet transfer to IP • unreliable, no flow control & sect;  4th application layer - numerous services such as TELNET, FTP, SMTP, HTTP, NNTP, ... 19 Example of the interaction from Stevens TCP / IP Illustrated 20 Data encapsulation from Stevens TCP / IP Illustrated 21 The ISO / OSI reference model 7. Application - data transfer, e-mail, terminal, remote login  6. Presentation - system-dependent display of the Data (EBCDIC / ASCII) & sect;  5. Session - setup, end, restart points & sect;  4. Transport (transport) - segmentation, avoidance of congestion & sect;  3. Switching (network) - routing & sect;  2. Backup (data link) - Checksums, flow control & sect;  1. Bit transmission (physical) - Mechanical, electrical aids 22 ISO / OSI - Layer 1 & sect;  Ak & uuml; fi - ISO: International Standards Organization - OSI: Open Systems Interconnections 1.Bit & uuml; Transmission (Physical) - Transmission of the pure bits - Technology (electronic / light) - Physical details (wavelength, modulation) 23 ISO / OSI - Layer 2 2. Security (Data Link Layer) - Correction of transmission errors - Data are divided into frames with control information & sect;  (e.g. Checksum) - Confirmation frames are sent back - Deleting duplicates - Compensating for fast senders - Slow receivers (flow control) - Solving problems during broadcasting • Access to shared medium = medium access control = MAC) 24 ISO / OSI - Layer 3 3rd network layer - Packet forwarding - Route determination / route selection of the packets (route detection) - Control of bottlenecks in the route selection - Billing of the packets (billing system) 25 ISO / OSI - Layer 4 4th transport layer - Subdivision of the data from the session layer into smaller units (packets) - As a rule, a transport connection is created for each connection that occurs - Possibly several transport connections for throughput optimization - Type of connection • error-free, Point-to-point (eg TCP) • error-prone, unidirectional (eg UDP) • multicasting (one to many) • broadcasting (e iner to all) - Multiplexing: To which connection does this packet belong - Flow control: How many packets can / should be sent (without overloading the network) 26 ISO / OSI - Layer 5 5th session layer - Definition of the session type , eg • File transfer, logging into a remote system - dialog control • If communication only alternates in one direction, the direction is controlled by the session layer - Token Management • If operations are not possible on both sides of the connection at the same time, this prevents this the session layer - synchronization • Checkpoints for resuming aborted operations (e.g. File transfer) 27 ISO / OSI layers 6 and 7 6th presentation layer - adaptation of encodings - e.g. character sets, names, address fields, forms, etc. 7th application layer - large variety of all possible functions, e.g. Virtual terminals • File transfer • E-mail • Video • Radio • Games ... 28 OSI versus TCP / IP (from Tanenbaum) 29 Hybrid model (from Tanenbaum) 30 Systems II 1. Organization, literature, Internet, TCP / IP layer model, ISO / OSI layers Christian Schindelhauer Technical Faculty Computer Networks and Telematics Albert Ludwigs University Freiburg 31
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