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Networking Fundamentals. Introduction and OSI model. OSI Model A Layered Approach To Manage Complexity. Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer. Introduction. Classifications. Classifications. LAN
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Networking Fundamentals Introduction and OSI model
OSI ModelA Layered Approach To Manage Complexity • Application Layer • Presentation Layer • Session Layer • Transport Layer • Network Layer • Data Link Layer • Physical Layer
Introduction Classifications
Classifications • LAN • Local Area Network • WAN • Wide Area Network • PAN • Personal Area Network • MAN • Metropolitan Area Network
Introduction Topologies
Topologies • Bus • Star • Ring • Mesh • Wireless • Hybrid
Introduction Network Models
Network Models • Client/Server • Peer-to-Peer
Introduction Protocols
Protocols • TCP/IP • FIR • ATM • LLDP • NetBIOS & NetBEUI • HTTP • FTP • SMTP
Introduction Devices
Devices • Media / Converters • NIC • Network Interface Card • Repeater • Hub • Gateway • Bridge • Switch • Router
Hub • Physical Layer • Box with lots of Ethernet connection sockets • Repeats messages to all connected nodes • Generates wasted traffic • Nodes must filter messages intended for them • Cheapest way to connect devices
Bridge • Data Link Layer • Single incoming and outgoing ports • Keeps MAC address tables for two LAN segments • Filters traffic using the MAC address
Switch • Connects all nodes to each other like a hub • Examines Ethernet messages for destination MAC address • Intelligently relays messages toward destination • More expensive than hubs • Can be combined with hubs
Router • Network Layer • A router connects to two different networks Ex: LAN to WAN (internet) • Routers maintain a so-called routing table to keep track of routes • Without routers the internet could not function • Uses the IP address to forward packets
Gateway • Application Layer down to network layer • Connect and translate data between networks with different protocols or architecture • For instance, allowing communication between TCP/IP clients and IPX/SPX or AppleTalk • A gateway links two systems that do not use the same: • Communication protocols • Data formatting structures • Languages • Architecture
Introduction Standards Groups
Standards Groups • IEEE • ISO • W3C • CERN • UL • EIA • TIA • ANSI
Standards Groups • IEEE Institute of Electrical and Electronics Engineers • ISO International Organization for Standardization • W3C World Wide Web Consortium • CERN European Organization for Nuclear Research • UL Underwriters Laboratories • EIA Energy Information Administration • TIA Telecommunications Industry Association • ANSI American National Standards Institute
Introduction OSI MODEL
OSI MODEL • Application • Presentation • Session • Transport • Network • Data Link • Physical Mnemonics to Remember Top Down: A Perfectly Simple Technology Narrowed Down Physically All People Seem To Need Data Processing All Pros Search Top Notch Donut Places Bottom Up: Programmers Like Networks That Seldom Postpone Anything* Programmers Dare Not Throw Salty Pretzels Away Please Do Not Throw Sausage Pizza Away Please Do Not Tell Sales People Anything People Don’t Need To See Paula Abdul People Desperately Need To See Pamela Anderson Paula Did Networking 'TilShe Passed Away * Uses L for Link layer rather than D for Data Link