CT 1505 Recent Developments in Networks Instructor: Dr. Najla Al-Nabhan Feb, 2015

Course Overview Course Code: CT 1505 Course Title: Recent Developments in Networks Course Co-requisite: CT1505Course Level: Fifth Credit Hours: 3(3+ 0) Lecture Time: Sunday 9:00 am- 12:00 pmSunday

Course Instructor Address Office Hours Office Number and Location RankName KSU.EDU.SA Sunday 12-3 Monday12-1 Office #: nd Flour, Bldg 1, Olishah Campus, KSU Assistant Professor Dr. Najla Al-Nabhan Course Website:

Course Syllabus  Aimed to impart  Facts of network technologies developments (historical background)  New and old network technologies;  Recent advanced network technologies;  Recent advancements indicators;  Life cycle of networking standards;  Future expectations;  User acceptance factors to recent developments;  Evaluation of recent applications.

Grading Overview  Homework Assignments: 10%  Quizzes: 15%  Class Participation: 5%  Mid-terms: 30%  Final Exam: 40%  One Quiz and/or tutorial per week, schedule will be announced soon

Course Textbook and References Main Course Reference:  Lectures & Assignments (reading, videos, homework)  Discussion Groups, Tutorials, Problem Solving, Debates, etc.  Selected papers and book chapters.  Additional Resources:  Text Book: Jim Kurose and Ross “Internetworking: A top-down Approach”  Technical reports and videos.

Lecture 1: Facts of network technologies developments (A historical background)

Computer Networks Computer networks? A group of interconnected computers -Represent a logical Result of the evolution of two of the most important scientific and technical branches of modern civilization – Computing and Telecommunications technologies.

From Batch Processing Toward Time-Sharing Queuing Theory 1.Centralized system based on mainframe 2.Multi-terminal System 3.Time sharing 1957

The Necessity: Time and Resource Sharing “ Time sharing tried to make it possible for research institutions to use the processing power of other institutions computers when they had large calculations to do that required more power, or when someone else's facility might do the job better ”

Networking History  Origins of Internet are hazy, visit for interesting readingwww.nethistory.info  Vint Cerf: “Internet Father “

Related Definitions and terminologies  The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to link several billion devices worldwide.  Packet switching is a digital networking communications method that groups all transmitted data – regardless of content, type, or structure – into suitably sized blocks, called packets.  The Advanced Research Projects Agency Network (ARPANET) is one of the world's first packet switching networks, the first network to implement TCP/IP, and was the main progenitor of what was to become the global Internet. (later DARPA)

Related Definitions and Concepts  ARBA network was initially funded by the Advanced Research Projects Agency (ARPA, later DARPA) within the U.S. Department of Defense for use by its projects at universities and research laboratories in the US.  The packet switching of the ARPANET, together with TCP/IP, would form the backbone of how the Internet works.

The ARPANET  Growth of the ARPANET (a) December (b) July  (c) March (d) April (e) September 1972.

Related Definitions and Concepts  The packet switching was based on concepts and designs by:  American engineer Paul Baran, scientist Donald Davies and Lawrence Roberts of the Lincoln Laboratory.  The TCP/IP communication protocols were developed for ARPANET by computer scientists Bob Kahn and Vint Cerf, and also incorporated some designs from Louis Pouzin.

Networking History  1961: Kleinrock - queuing theory shows effectiveness of packet-switching  1964: Baran -packet-switching in military applications for survivable networks  1967: ARPAnet conceived by Advanced Research Projects Agency  1969: First ARPAnet node operational  Prof. Kleinrock sends a message across from UCLA to Stanford  1972:  ARPAnet demonstrated publicly  NCP (Network Control Protocol) first host-host protocol  First program  ARPAnet has 15 nodes

Networking History...  1970: ALOHAnet satellite network in Hawaii (CSMA developed), later connects to ARPANet  1973: Bob Metcalfe’s PhD thesis proposes Ethernet (CSMA/CD developed)  1974: Cerf and Kahn - architecture for interconnecting networks: the word “Internet” makes its appearance from Cerf’s writings

Networking History...  Time sharing became difficult since different machines had different operating systems, versions and programs. However, these led to development of Internet  Reference Models  Vinton Cerf. Bob Kahn, and (…….) developed TCP/IP  Cerf and Kahn’s internetworking principles:  simplicity, autonomy - no internal changes required to interconnect networks  best effort service model  stateless routers  decentralized control define today’s Internet architecture

Networking History...  1978: TCP/IP v4 was released  Aimed to interconnect different kinds of networks  1979: ARPAnet has 200 nodes  1983: deployment of TCP/IP in ARPAnet  1983: SMTP protocol defined  1983: DNS defined for name-to-IP-address translation  1985: FTP protocol defined  1988: TCP congestion control  100,000 hosts connected to confederation of networks

Networking History...  Early 1990s: WWW  Hypertext  HTTP: Tim Berners-Lee develops WWW an Internet based hypermedia initiative, and specifies URLs, HTTP and HTML which became basis for today’s WWW  1994: Mosaic (Univ. of Illinois), later Netscape the major browsers until late 1990’s  late 1990’s: commercialization of the WWW, with introduction of HTTPS e- commerce is realized Late 1990’s:  50 million computers on Internet  100 million+ users  backbone links running at 1 Gbps

Hosts on the Web

Internet Users: By language

Internet Content: By language

Questions  Which appeared earlier than the other: WANs or LANs? Why?  Reference: EP pdf EP pdf  Summaries this video in Arabic and English 