1 / 40

Basic Concepts

Basic Concepts. Prof. Choong Seon HONG. Basic Concepts. Five general concepts provide the basis for the relationship between the communicating devices. Line configuration Topology Transmission mode Categories of Networks Internetworks. 2.1 회선구성 (Line configuration).

laurenb
Download Presentation

Basic Concepts

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Basic Concepts Prof. Choong Seon HONG

  2. Basic Concepts • Five general concepts provide the basis for the relationship between the communicating devices. • Line configuration • Topology • Transmission mode • Categories of Networks • Internetworks

  3. 2.1 회선구성 (Line configuration) ~ refers to the way two or more communication devices attach to a link ~ defines the attachment of communication devices to a link Line configuration Point-to-point Multipiont

  4. Line configuration (cont’d) • 점-대-점(Point-to-point) ~ provides a dedicated link between two devices. • 다중 점(Multipoint) : multidrop ~ is configuration in which more than two specific devices share a single link

  5. Link Line configuration (cont’d) • 점-대-점 회선 구성

  6. Link Line configuration (cont’d) • 점-대-점 회선 구성

  7. Line configuration (cont’d) • 점-대-점 회선 구성

  8. Line configuration (cont’d) • 다중 점 회선 구성

  9. 접속형태(Topology) ~ refers to the way a network is laid out, either physically or logically ~ defines the physical or logical arrangement of link in a network • A consideration when choosing a topology is the relative status of the devices to be linked. • peer-to-peer : the devices share the link equally(ring, mesh) • primary-secondary : one device controls traffic and the others must transmit through it (star, tree)

  10. 접속형태 분류(Categories of topology) Topology Mesh Star Bus Ring Tree

  11. 그물형 (Mesh) • Every device has a dedicated point-to-point link to every other device. • A fully connected mesh network therefore has n(n-1)/2 physical channels to link n devices.

  12. 그물형(cont’d) • Mesh topology

  13. Mesh (cont’d) • Advantages • The use of dedicated links guarantees that each connection can carry its data load. • Mesh topology is robust. • Privacy and security. • Point-to-point links make fault identification and fault isolation easy.

  14. 그물형 (cont’d) • Disadvantages ~ are related to the amount of cabling and the number of I/O ports • because every device must be connected to every other device, installation and reconfiguration are difficult • the sheer bulk of the wiring can be greater than the available space(in walls, ceiling, or floors) can accommodate • the hardware required to connect each link (I/O port and cable) can be prohibitively expensive

  15. 스타형 (Star : 성형) • Each device has a dedicated point-to-point link only to a central controller, usually called a hub

  16. Star (cont’d) • Star topology

  17. Star (cont’d) • Advantage • Each device needs only one link and one I/O port to connect it to any number of others (easy to install and reconfigure) • Robustness • if one link fails, only that link is affected

  18. 트리형 (Tree) • is a variation of a star • active hub(central hub) ~ contains a repeater, which is a hardware device that generates the received bit patterns before sending them out • passive hub ~ provides a simple physical connection between the attached devices

  19. Tree (cont’d) • Tree topology

  20. Tree (cont’d) • Advantage & Disadvantage • are generally the same as those of a star

  21. 버스형 (Bus) • is multipoint. One long cable acts as a backbone to link all the devices in the network • Nodes are connected to the bus cable by drop lines and taps • drop line ~ is a connection running between the device and the main cable • tap ~ is a connector either splices into the main cable or punctures the sheathing of a cable to create a contact with the metallic core

  22. Bus (cont’d) • Bus topology

  23. Bus (cont’d) • Advantages ~ include ease of installation • Disadvantages ~ include difficult reconfiguration and fault isolation

  24. 링형 (Ring) • Each device has a dedicated point-to-point line configuration only with the two devices on either side of it • Advantage ~ is relatively easy to install and reconfigure ~ fault isolation is simplified • Disadvantage • unidirectional traffic • break in the ring can disable the entire network --> needs dual ring

  25. Ring (cont’d) • Ring topology

  26. 혼합형(Hybrid topology)

  27. 2.3 전송모드(Transmission mode) ~ is used to define the direction of signal flow between two link devices • 단방향(Simplex) • is unidirectional, as on a one-way street (keyboard, monitor) • 반이중(Half-Duplex) • each station can both transmit and receive, but not at the same time • 전이중(Full-Duplex) • both stations can transmit and receive simultaneously

  28. Transmission Mode (cont’d) Transmission modes Simplex Half-duplex Full-duplex

  29. Transmission Mode (cont’d) • 단방향 (Simplex)

  30. Transmission Mode (cont’d) • 반이중(Half-Duplex)

  31. Transmission Mode (cont’d) • 전이중(Full-Duplex)

  32. 2.4 네트워크 분류 (Categories of Networks) • three primary categories • 근거리 통신망 (LAN) • 도시 통신망 (MAN) • 광역 통신망 (WAN) • size, ownership, distance it cover, physical architecture

  33. Categories of Networks (cont’d) Network Wide area network (WAN) Local area networks (LAN) Metropolitan area network (MAN)

  34. Categories of Networks (cont’d) • LAN(Local Area Networks) ~ is usually privately owned and links the devices in a single office, building or campus

  35. Categories of Networks (cont’d)

  36. Categories of Networks (cont’d) • MAN(Metropolitan Area Networks) ~ is designed to extend over an entire city

  37. Categories of Networks (cont’d) • WAN(Wide Area networks) ~ provides long-distance transmission of data, voice, image, and video information over large geographical areas that may comprise a country, a continent, or even the whole world

  38. Categories of Networks (cont’d) • WAN

  39. 2.5 네트워크간 네트워크 (Internetworks) ~ is an interconnection of networks by the use of internetworking device(router and gateway) • cf. • internet: an interconnection of networks • Internet: a specific worldwide network

  40. Internetworks (cont’d) • Internetwork (internet)

More Related