1a Net. Intro_

1a Net. Intro_ - 1a. Introduction to Networking (03/30) 1....

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1 1a. Introduction to Networking (03/30) 1. Communication Link 2. General Definition 3. Example of Computer Communication Systems 4. Networking a. Telephone Network b. Computer Networks c. Cable Television d. Wireless Networks . 5. Communication Standards a. System Interconnection 6. OSI/RM 7. Layer Descriptions 8. The TCP/IP Reference Model a. Protocol Hierarchies b. Internet Layer c. Transport Layer d. Application Layer e. Host-to-Network Layer 9. Packet Switching and Circuit Switching
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2 1. Communication Link Input Device 1 2 3 4 5 6 Input Information Input Data or Signal Transmitted Signal Received Signal Output Information Output Data or Signal Transmitter Tr ansmission Medium Receiver Output Device 2 1 3 4 5 6 Source System Destination System Data Communication Link
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3 Communication Networks 6 +4
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4 b. Computer or Data Communication Networks Data packets Packet switching + Rules of operations (protocols) =The ARPANET -single packet format and addressing scheme. Through the ARPANET was evolved into the Internet. ARPANET architecture was formalized layered model of OSI The packet switching technique in networks is based on Multiplexing and/or Multiple Access methods of computer interconnections. Multiplexing: TDM; FDM (WDM / DWDM) Multiple Access: Ethernet Network. Token Ring Network. Fiber Distributed Data Interface - UCLA, Birthplace of Internet
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5 Model of the information system Clients Server Network Broadcast links. Point-to-point (unicast) links
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6 LAN , MAN, WAN three characteristics: (1) their size, (2) their transmission technology, (3) their topology. A B Ethernet Token Ring IEEE 802.3 IEEE 802.5 LAN Protocols
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7 Wide Area Network (WAN) Subnet: communication aspects Router (Switch) Host (Server) application aspects Metropolitan Area Networks (MAN) MAN represents as a interconnected LANs by point-to-point communication links. The interconnection is controlled by switches, Client Links LAN
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8 d. Wireless Networks . The first packet-switched wireless network- in 1971- Alohanet, interconnected computers on four islands in a star topology : A first approximation wireless network- three main categories: 1. Components interconnection . Short-range radio. Bluetooth network . 2. Wireless LANs permitting per-to-per communications. LANs called IEEE 802.11 , can operate at bit rates up to about 50 Mbps over distances of tens of meters . 3. Wireless WANs . The radio network used for cellular telephones is an example of a low-bandwidth wireless wide area system. This system has already gone through three generations : a. The first- analog and voice only. b. The second- digital and for voice only. c. The third- digita l and is for both voice and data . Cellular systems operate below 1 Mbps , but the distances between the base station and the computer or telephone is measured in kilometers.
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9 Shared wireless access network connects end system to router via base station “access point” wireless LANs: - 802.11b: - 50 Mbps, tens of meters wireless WAN - Cellular systems - < 1Mbps, several km base station mobile hosts router Wireless access networks
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10 5.
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This note was uploaded on 04/05/2010 for the course CS M117 taught by Professor Dzhanidze during the Spring '09 term at UCLA.

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1a Net. Intro_ - 1a. Introduction to Networking (03/30) 1....

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