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    02  module internet concept overview 02 module internet concept overview Presentation Transcript

    • Objectives
      • On completion of this chapter , you will be able to perform the following tasks:
      • Describe how data traffic is exchanged between source and destination devices
      • Identify the roles and functions of a hub, switch, and router, and where they best fit in the network
      • Select the appropriate Cisco equipment for a given set of network requirements
    • Floor 2 Server Farm Floor 1 Campus Remote Telecommuter ISDN Branch Office Defining the components of a Network(cont.)
    • Network Structured Defined By Hierarchy Core Layer Distribution Layer Access Layer
    • Access Layer End station entry pint to the network Access Layer Characteristics
      • Access Layer
      • Aggregation Point
      • Router traffic
      • Broadcast / Multicast
      • Domains
      • Media Transiation
      • Security
      • Possible point for remote access
      Distribution Layer Characteristics Distributed Layer
    • Core Layer Characteristics Core Layer
      • Fast transport to enterprise services
      • No packet manipulation
    • OSI Model Overview Application (upper) Layers
      • Reduces complexity
      • Standardizes interfaces
      • Facilitates modular engineering
      • Ensures interoperable technology
      • Accelerates evolution
      • Simplifies teaching and learning
      Data Flow Layers Application Presentation Session Transport Network Data Link Physical 7 6 5 4 3 2 1
    • Application Presentation Session Transport Data Link Network Physical EXAMPLES Telnet HTTP ASCII, EBCDIC JPEG Operating System / Application Access Scheduling Role of Application Layers
      • Reliable Or Unreliable delivery
      • Error correction before retransmit
      • Provide logical addressing which routers use for path determination
      • Combine bits into bytes and bytes into frames
      • Access to media using MAC address
      • Error detection not correction
      • Move bits between devices
      • Specifies voltage , wire speed and pin-out cables
      Role of Data Flow Layers EXAMPLES TCP UDP SPX IP IPX 802.3/802.2 HDLC WIA/TIA-232 V.35 Application Presentation Session Transport Network Data Link Physical 7 6 5 4 3 2 1
    • Application Presentation Session Transport Network Data Link Physical Data Data Upper layer data Upper layer data TCP Header Data IP Header LLC Header MAC Header 0101110101001000010 Encapsulation Data PDU Bits Frame Packet Segment
    • Application Session Presentation Transport Data Link Network P hysical Upper Layer Data Upper Layer Data TCP+Upper Layer Data IP+TCP+Upper Layer Data MAC Header TCP Header LLC Hdr+IP+TCP+Upper Layer Data LLC Header IP Header 0101110101001000010 De-Encapsulation Data
    • Physical Layer Functions
      • Signaling Type
      • Connector
      • Media Type
      Defines Physica l Ethernet 802.3 V.35 EIA/TIA-232
    • Host 10 Base 2__ Thick Ehernet 10 Base 2__ Thick Ehernet Hub Hosts 10 Base T _ Twisted Pair Physical Layer :Ethernet/802.3
    • Physical
      • All devices in the same collisions domain
      • All devices in the same broadcast domain
      • Devices share the same bandwidth
      Hubs operate at Physical Layer A B C D
    • Hubs: One Collision Domain More end stations means more collisions CSMA/CD is used
    • Data Link Layer Functions 802.2 HDLC Data Link Defines Physical source and destination address Higher layer protocol (Service Access Point) associated with frame Network topology Frame sequencing Flow control Connection-oriented or connectionless Physical Ethernet 802.3 EIA/TIA_232 V.35 Frame Relay
    • Data Link Layer Functions 0000.0c xx.xxxx 8 Preamble Dest Add Source Add Length Data FCS 6 6 2 Variable 4 Ethernet II uses “Type “ here and does not use 802.2 IEEE assigned Vender assigned MAC Layer -802.3 # Bytes
    • OR Data Link Switches and Bridges Operate at Data Link Layer
      • Each segment has its own collision domain
      • All segments are in the same broadcast domain
      1 2 3 4 1 2
    • Switch
      • Each segment has its own collision domain
      • Broadcasts are forwarded to all segments
      Memory Switches
    • Physical Ethernet 802.3 EIA/TIA_232 V.35 Frame Relay Network Data Link IP, IPX 802.2 HDLC Network Layer Functions
      • Interconnects multiple data links
      • Defines paths through network
      • Defines logical source and destination addresses associated with a specific protocol
    • Network Layer Functions Network Layer End Station Packet Source address IP Header Destination address Data 172.15.1.1
      • Logical Address
      Network Node
    • 172.16.122.204 255.255.0.0 10101100 00010000 01111010 11001100 11111111 11111111 00000000 00000000 172 16 122 204 255 255 0 0 Host Network Layer Functions(cont.) Network Address Mask Binary Address Binary Mask
    • Routing Table NET INT Metric Routing Table INT NET Metric 1 2 4 E0 S0 S0 0 0 1 1 2 4 S0 S0 E0 1 0 0 1.1 1.2 1.0 E 0 S 0 1.3 2.1 2.2 4.3 S 0 E 0 4.0 4.1 4.2 Network Layer Function (cont.)
      • Logical addressing allows for hierarchical network
      • Configuration required
      • Uses configured information to identify paths to networks
    • Routers: Operate at the Network Layer Broadcast control Connects to WAN services Traffic management Multicast control Multicast Path determination
    • Telecommuter Mobile User Branch Office Main Office Internet Using Routers to Provide Remote Access Modem or ISDN TA
    • Transport TCP UDP SPX Network IP IPX Transport Layer Functions
      • Distinguished between Upper Layer applications.
      • Establishes end-to-end connectivity between applications.
      • Defines flow control.
      • Provides reliable or unreliable services for data transfer.
    •  
    • Network Devices Domains Bridge Switch Router Hub Collision Domains: Broadcast Domains: 1 4 4 4 1 1 1 4