Computer Networks รศ.ดร.อน นต ผลเพ ม. Assoc. Prof. Anan Phonphoem, Ph.D. Kasetsart University, Bangkok, Thailand
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1 Jan May 2018 Computer Networks รศ.ดร.อน นต ผลเพ ม Assoc. Prof. Anan Phonphoem, Ph.D. Computer Engineering Department Kasetsart University, Bangkok, Thailand 1
2 Data Communication Review Communication Concept Physical Connectivity Layering Concept Data Link Protocols LAN 2
3 How can the communication happen? 3
4 Data Communication Hi Hi How How are are you you doing? doing? Hi Hi How are you doing? doing? Computer User
5 Data Communication Components 1 Message Hi How are you doing? 2 Sender 5 Protocol 3 Receiver 4 Medium 5
6 Networks Set of Devices Media Links 6
7 Networks Set of Devices Media Links 7
8 Data Communication Review Communication Concept Physical Connectivity Layering Concept Data Link Protocols LAN 8
9 Line configuration Defines the attachment of communication devices to a link A link A physical communication pathway 2 possible configurations Point-to-point Multipoint 9
10 Point-to-point Link Satellite dish Satellite dish 10
11 Multipoint Link 11
12 Topology The way a network is physically or logically layout 2 or more devices connected to a link 2 or more links form a topology 12
13 Mesh Topology Each device has a dedicated point-to-point link total links = n(n-1)/2 13
14 Star Topology Each device has a dedicated point-to-point link to a central controller (Hub) PWR M100M ACTACT UPLINK COLCOL SWITCH
15 Tree Topology A variation of star PWR 10M100M ACTACT UPLINK COLCOL SWITCH PWR 10M100M ACTACT UPLINK COLCOL SWITCH PWR 10M100M ACTACT UPLINK COLCOL SWITCH
16 Bus Topology Each node connects to the Bus (a long cable running as a backbone) Terminator 16
17 Ring Topology Each device has a dedicated point-to-point with its neighbors 17
18 Ring Physical Topology IBM 8272 Token Ring LAN Switch
19 PWR M100M ACTACT COLCOL SWITCH UPLINK Hybrid Topologies PWR 10M100M ACTACT UPLINK COLCOL SWITCH
20 Transmission mode The direction of signal flows between two linked devices Three types of transmission modes Simplex Half-duplex Full-duplex 20
21 Data Communication Review Communication Concept Physical Connectivity Layering Concept Data Link Protocols LAN 21
22 Computer Communication Model Modularity Well-defined interfaces Well-defined functions and protocol 22
23 Transmit a letter 23
24 Layered Architecture User User Support Applications Allow interoperability Transport Ensure reliable data transmission Network Support Moving data Physical connections Network 24
25 Layering Concept 1. Interfaces between layers (Physical) 2. Peer-to-Peer process (Logical) 25
26 1. Interfaces between layers (Physical) 5 4 Above 3 2 Below 1 26
27 2. Peer-to-Peer process (Logical)
28 Open Systems Interconnection (OSI) Model User User Support Transport Network Support Network 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data Link 1 Physical 28
29 OSI Model 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data Link 1 Physical User service Translate format, encrypt Session manage, checkpoints Reliable end-to-end (whole message) Packet end-to-end (across network) Node-to-node (same network segment) Physical 29
30 OSI model It s just a model 7 Application 6 Presentation TCP/IP Applications 5 Session 4 Transport 3 Network 2 Data Link 1 Physical TCP/ UDP IP Data Link Physical 30
31 TCP/IP Protocol Suite (Internet Model) Applications Transport Network Data Link Physical User service and interface Process delivery + Error (TCP/UDP) Reliable end-to-end (whole message) Move packets from source to destination Packet end-to-end (across network) Provide frames Node-to-node (same network segment) Transmission bit streams (mechanical and electrical spec) 31
32 Direct connection 5 Application 5 Application 4 Transport 3 Network 2 Data Link 1 Physical 4 Transport 3 Network 2 Data Link 1 Physical 32
33 Connection via intermediate nodes Link Link 5 Application 4 Transport 3 Network 2 Data Link 1 Physical Network 5 Application 4 Transport 3 Network 2 Data Link 1 Physical 33
34 Data Flow in a station Hello 5 Application 5 Hello 4 Transport 3 Network Hello 4 5 Hello Encapsulation 2 Data Link 1 Physical Hello T
35 Data Communication Review Communication Concept Physical Connectivity Layering Concept Data Link Protocols LAN 35
36 TCP/IP Protocol Suite 5 Application 4 Transport 3 Network 2 Data Link 1 Physical Physical characteristics of interface Stream of Bits (e.g., ) Line config. (e.g., point-to-point) Topology (e.g., bus, star) Transmission mode (e.g., half-duplex, full-duplex) Encoding Error detection (and correction) 36
37 TCP/IP Protocol Suite 5 Application 4 Transport 3 Network 2 Data Link Line Discipline Flow Control Error Control 1 Physical 37
38 Data Link Control Line Discipline Who Should send data and When? Flow Control How much data may be sent? Error Control How can errors be Detected and correct? 38
39 Data Link Control Line Discipline ENQ / ACK Poll / Select Flow Control Error Control 39
40 Line Discipline: ENQ/ACK 40
41 Line Discipline:Poll/Select Primary-secondary communication Multipoint Discipline 41
42 Data Link Control Line Discipline Flow Control Error Control a set of procedures used to restrict the amount of data that the sender can send Stop-and-wait (one frame at a time) Sliding window (several frames at a time) 42
43 Stop-and-wait 43
44 Sliding window 44
45 Data Link Control Line Discipline Flow Control Stop-and-wait ARQ Error Control Sliding window ARQ Go-back-n Selective-reject 45
46 Stop-and-wait ARQ: Lost data frame 46
47 Sliding Window Go-back-n: Damaged data frame 47
48 Sliding Window Selective-reject: Damaged data frame 48
49 Data Communication Review Communication Concept Physical Connectivity Layering Concept Data Link Protocols LAN 49
50 Local Area Networks Project 802 Ethernet Token Ring FDDI 50
51 OSI Model and Project 802 LLC: Logical Link Control MAC: Medium Access Control 51
52 IEEE 802 LAN Std. Family 802 Overview and Architecture Network Management Logical Link Control (LLC) CSMA/CD - Ethernet Conformance Test Methodology for IEEE Token Passing Bus Token Ring Metropolitan Area Network (MAN) : DQDB Broadband LAN Fiber Optic Isochonous LAN Integrated Service Security Wireless LAN Demand Priority Wireless PAN Broadband Wireless Access (Wireless MAN) Resilient Packet Ring Radio Regulatory 52
53 IEEE 802 LAN Std. Family Layer CSMA/CD Logical Link Control (LLC) Token Bus Token Ring Wireless LAN MAC PHY Layer 2 Data Link Layer 1 Physical 53
54 3 Generations of Ethernet 54
55 802.3 MAC Frame Preamble + SFD Flag in HDLC 55
56 Ethernet Address Unicast Address (for source and Destination) Broadcast Address Multicast Address range of E to E-7F-FF-FF 00-E0-00-AB FF-FF-FF-FF-FF-FF E
57 Ethernet Address: hands-on Show the followings: # interfaces your Ethernet Address Your network card company
58 Ethernet For Baseband: Manchester Encoding For Broadband: Differential PSK Support up to 100 Mbps 58
59 10BaseT 59
60 Collision Domain 60
61 Switched Ethernet 61
62 100Base-TX 62
63 1000Base-X 63
64 1000Base-T 64
65 Token Passing 65
66 Token Ring Frame 66
67 Token Ring 67
68 Token Ring Switch 68
69 FDDI Rings 69
70 FDDI Ring Failure 70
71 Data Communication Review Communication Concept Physical Connectivity Layering Concept Data Link Protocols LAN 71
72 Warriors of The Net Sit Back and Relax Enjoy the show 72
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