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02 module internet concept overview

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Objectives ,[object Object],[object Object],[object Object],[object Object]
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
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Distribution Layer Characteristics Distributed Layer
Core Layer Characteristics Core Layer ,[object Object],[object Object]
OSI Model Overview Application (upper) Layers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],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
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],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 ,[object Object],[object Object],[object Object],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 ,[object Object],[object Object],[object Object],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 ,[object Object],[object Object],1 2 3 4 1 2
Switch ,[object Object],[object Object],Memory Switches
Physical Ethernet 802.3 EIA/TIA_232 V.35 Frame Relay Network Data Link IP, IPX 802.2 HDLC Network Layer Functions ,[object Object],[object Object],[object Object]
Network Layer Functions Network Layer End Station Packet Source address IP Header Destination address Data 172.15.1.1 ,[object Object],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.) ,[object Object],[object Object],[object Object]
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 ,[object Object],[object Object],[object Object],[object Object]
 
Network Devices Domains Bridge Switch Router Hub Collision Domains: Broadcast Domains: 1 4 4 4 1 1 1 4

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02 module internet concept overview

  • 1.
  • 2. Floor 2 Server Farm Floor 1 Campus Remote Telecommuter ISDN Branch Office Defining the components of a Network(cont.)
  • 3. Network Structured Defined By Hierarchy Core Layer Distribution Layer Access Layer
  • 4. Access Layer End station entry pint to the network Access Layer Characteristics
  • 5.
  • 6.
  • 7.
  • 8. Application Presentation Session Transport Data Link Network Physical EXAMPLES Telnet HTTP ASCII, EBCDIC JPEG Operating System / Application Access Scheduling Role of Application Layers
  • 9.
  • 10. 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
  • 11. 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
  • 12.
  • 13. Host 10 Base 2__ Thick Ehernet 10 Base 2__ Thick Ehernet Hub Hosts 10 Base T _ Twisted Pair Physical Layer :Ethernet/802.3
  • 14.
  • 15. Hubs: One Collision Domain More end stations means more collisions CSMA/CD is used
  • 16. 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
  • 17. 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
  • 18.
  • 19.
  • 20.
  • 21.
  • 22. 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
  • 23.
  • 24. Routers: Operate at the Network Layer Broadcast control Connects to WAN services Traffic management Multicast control Multicast Path determination
  • 25. Telecommuter Mobile User Branch Office Main Office Internet Using Routers to Provide Remote Access Modem or ISDN TA
  • 26.
  • 27.  
  • 28. Network Devices Domains Bridge Switch Router Hub Collision Domains: Broadcast Domains: 1 4 4 4 1 1 1 4