: Chapter 2 Networking Fundamentals.

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Transcription:

241-206: Chapter 2 Networking Fundamentals touch@coe.psu.ac.th Wednesday, June 10, 2009

Chapter Outline

Chapter Outline Network Terminology Wednesday, June 10, 2009

Chapter Outline Network Terminology Bandwidth Wednesday, June 10, 2009

Chapter Outline Network Terminology Bandwidth Networking Models Wednesday, June 10, 2009

Network Terminology

Physical Network Topology Wednesday, June 10, 2009

Computer Communication Protocol data representation signaling authentication error detection Wednesday, June 10, 2009

Standard Organization IETF, IEEE, ISO for internet communication ITU-T for telecommunications and PSTN ITU-R for radio communications NMEA for marine electronics etc. Wednesday, June 10, 2009

Proprietary Standards AppleTalk DECnet IPX/SPX Server Message Block (SMB) and CIFS Systems Network Architecture (SNA) Apple Filing Protocol (AFP) Wednesday, June 10, 2009

Local Area Network (LAN) Operate within a limited geographical area Usually required high data rate transmission Control the network privately under local administration Provide full-time connectivity to local services Connect physically adjacent devices Wednesday, June 10, 2009

LAN Devices

LAN Devices Repeater Wednesday, June 10, 2009

LAN Devices Repeater HUB Wednesday, June 10, 2009

LAN Devices Repeater HUB Bridge Wednesday, June 10, 2009

LAN Devices Repeater HUB Bridge Ethernet Switch Wednesday, June 10, 2009

LAN Devices Repeater HUB Bridge Ethernet Switch Router Wednesday, June 10, 2009

Wide Area Network (WAN) Operate over a large geographical area Allow access over serial interfaces operating at lower speeds Provide full-time and part-time connectivity Connect devices separated over wide, even global areas Wednesday, June 10, 2009

WAN Devices

WAN Devices Router Wednesday, June 10, 2009

WAN Devices Router Modem, DSU/CSU, TA/NT Wednesday, June 10, 2009

WAN Devices Router Modem, DSU/CSU, TA/NT Communication Switch Wednesday, June 10, 2009

Metropolitan Area Network (MAN)

Storage Area Network (SAN) Wednesday, June 10, 2009

Virtual Private Network (VPN)

VPN Technologies

Intranet and Extranet

Bandwidth

Why bandwidth is so important? Bandwidth is limited by physics and technology Bandwidth is not free Bandwidth requirement are growing at a rapid rate Bandwidth is critical to network performance Wednesday, June 10, 2009

Pipe Analogy for Bandwidth Wednesday, June 10, 2009

Highway Analogy for Bandwidth

Units of Bandwidth

Units of Bandwidth Unit of Bandwidth Abbreviation Equivalence Wednesday, June 10, 2009

Units of Bandwidth Unit of Bandwidth Abbreviation Equivalence Bits per second bps 1 bps = fundamental unit of bandwidth Wednesday, June 10, 2009

Units of Bandwidth Unit of Bandwidth Abbreviation Equivalence Bits per second bps 1 bps = fundamental unit of bandwidth Kilobits per second kbps 1 kbps = ~1,000 bps Wednesday, June 10, 2009

Units of Bandwidth Unit of Bandwidth Abbreviation Equivalence Bits per second bps 1 bps = fundamental unit of bandwidth Kilobits per second kbps 1 kbps = ~1,000 bps Megabits per second Mbps 1 Mbps = ~1,000 kbps Wednesday, June 10, 2009

Units of Bandwidth Unit of Bandwidth Abbreviation Equivalence Bits per second bps 1 bps = fundamental unit of bandwidth Kilobits per second kbps 1 kbps = ~1,000 bps Megabits per second Mbps 1 Mbps = ~1,000 kbps Gigabits per second Gbps 1Gbps = ~1,000 Mbps Wednesday, June 10, 2009

Units of Bandwidth Unit of Bandwidth Abbreviation Equivalence Bits per second bps 1 bps = fundamental unit of bandwidth Kilobits per second kbps 1 kbps = ~1,000 bps Megabits per second Mbps 1 Mbps = ~1,000 kbps Gigabits per second Gbps 1Gbps = ~1,000 Mbps Terabits per second Tbps 1 Tbps = ~1,000 Gbps Wednesday, June 10, 2009

Maximum Bandwidths and Length Limitations Wednesday, June 10, 2009

WAN Services and Bandwidth

Throughput Actual measured bandwidth throughput <= Digital Bandwidth of a medium Wednesday, June 10, 2009

Variables that May Affect Throughput PC (client) The server Other users on the LAN Routing within the Cloud The design (topology) of all networks involved Type of data being transferred Times of day Wednesday, June 10, 2009

Transfer Time Calculation

Audio Analogy of Bandwidth Wednesday, June 10, 2009

Networking Models

Analyzing Network in Layers

Network Comparisons

Network Communications

Layer Communications

OSI Model

Benefits of the OSI Model Reduces complexity Standardizes interfaces Facilitates modular engineering Ensures interoperate technology Accelerates evolution Simplifies teaching and learning Wednesday, June 10, 2009

Physical Layer

Datalink Layer

Network Layer

Transport Layer

Session Layer

Presentation Layer

Application Layer

Peer-to-Peer Communications

Peer-to-Peer Communications

TCP/IP Model

Common TCP/IP Protocols

Comparing TCP/IP with OSI Model

Data Encapsulation 010101010101010101 Wednesday, June 10, 2009

Data Encapsulation Example Wednesday, June 10, 2009