OSI Network Layer

Chapter 5 - LAN architecture. After studying this chapter you will be able to: Identify the seven protocol layers of the Open System Interconnection (OSI) Reference Model, discuss the functional attributes of each layer of the Open Systems Interconnection Reference Model, understanding Putting Data on the Cable and Access Methods.

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Learning objectives of this chapter include: Understand the architecture of the OSI model, understand the layers of the OSI model and their functions, understand the architecture of the TCP/IP Protocol Suite, differentiate between the OSI model and the TCP/IP Suite, differentiate between the three types of Internet addresses.

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This chapter objectives: Describe how the functions of the three upper OSI model layers provide network services to end user applications, describe how the TCP/IP Application Layer protocols provide the services specified by the upper layers of the OSI model, define how people use the Application Layer to communicate across the information network,...

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This chapter explain the role of Transport Layer protocols and services in supporting communications across data networks, analyze the application and operation of TCP mechanisms that support reliability, analyze the application and operation of TCP mechanisms that support reassembly and manage data loss, analyze the operation of UDP to support communicate between two processes on end devices.

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Identify the role of the Network Layer, as it describes communication from one end device to another end device; Examine the most common Network Layer protocol, Internet Protocol (IP), and its features for providing connectionless and best-effort service;... Inviting you to refer.

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After completing this chapter, students will be able to: Explain the role of Physical layer protocols and services in supporting communication across data networks, describe the role of signals used to represent bits as a frame as the frame is transported across the local media, describe the purpose of Physical layer signaling and encoding as they are used in networks.

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Bài giảng Lập trình mạng nâng cao ICMP protocol - Nguyễn Vũ nhằm giới thiệu đến bạn đọc về giao thức ICMP (Internetwork Control Message Protocol), hoạt động ở layer 2 – Internetwork trong mô hình TCP/IP hoặc layer 3 – Network trong mô hình OSI. Mời các bạn tham khảo nội dung chi tiết.

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Preamble/SOFD: Synchronize to medium. Destination Address: MAC Address of destination device. Source Address: MAC address of source device. • Length/Type: Length of frame or protocol type code. Data: Encapsulated data from OSI Layers 7 to 3. FCS: Frame Check Sequence.Broadcast: Indicates a broadcast or multicast frame. Local: indicates whether the address can be modified locally. OUI Number: Manufacturer of the NIC. Vendor Number: Unique, vendor assigned number.

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Communication Architecture Strategy for connecting host computers and other communicating equipment. Defines necessary elements for data communication between devices. A communication architecture, therefore, defines a standard for the communicating hosts. A programmer formats data in a manner defined by the communication architecture and passes it on to the communication software. Separating communication functions adds flexibility, for example, we do not need to modify the entire host software to include more communication devices....

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The Data-over-Cable Service Interface Specification (DOCSIS)is an international standard developed by CableLabs, a non-profit research and development consortium for cable-related technologies. • DOCSIS specifies the OSI Layer 1 and Layer 2 requirements: Physical layer-For data signals that the cable operator can use, DOCSIS specifies the channel widths (bandwidths of each channel) as 200 kHz, 400 kHz, 800 kHz, 1.6 MHz, 3.2 MHz, and 6.4 MHz. DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data).

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The primary duties of the transport layer, Layer 4 of the OSI model, are to transport and regulate the flow of information from the source to the destination, reliably and accurately. End-to-end control and reliability are provided by sliding windows, sequencing numbers, and acknowledgments To understand reliability and flow control, think of someone who studies a foreign language for one year and then they visit the country where that language is used.

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Giao thức IPsec được làm việc tại tầng Network Layer – layer 3 của mô hình OSI. Các giao thức bảo mật trên Internet khác như SSL, TLS và SSH, được thực hiện từ tầng transport layer trở lên (Từ tầng 4 tới tầng 7 mô hình OSI). Điều này tạo ra tính mềm dẻo cho IPsec, giao thức này có thể hoạt động từ tầng 4 với TCP, UDP, hầu hết các giao thức sử dụng tại tầng này. IPsec có một tính năng cao cấp hơn SSL và các phương thức khác hoạt động tại các tầng trên...

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Đợc phát triển bởi tổ chức tiêu chuẩn thế giới ISO (International Standard Organization) Gồm có 7 tầng: Tầng vật lý (Physical layer) . Tầng liên kết dữ liệu (Data link layer) Tầng mạng (Network layer) . Tầng vận chuyển (Transport layer) . Tầng giao dịch (Session layer) . Tầng trình bỡy (Presentation) . Tầng ứng dụng (Application layer) .

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Networking Hardware Identify the functions of LAN connectivity hardware Install and configure a NIC (Network Interface Card) Identify problems associated with connectivity hardware Describe the factors involved in choosing a NIC, hub, switch, or router Discuss the functions of repeaters, hubs, bridges, switches, routers, and gateways, and the OSI Model layers at which they operate Describe the use and types of routing protocols

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Network Protocols Identify the characteristics of TCP/IP, IPX/SPX, NetBIOS, and AppleTalk Understand how network protocols correlate to layers of the OSI Model Identify the core protocols of the TCP/IP suite and describe their functions Identify the well-known ports for key TCP/IP services Understand addressing schemes for TCP/IP, IPX/SPX, NetBEUI, and AppleTalk Describe the purpose and implementation of DNS (Domain Name System) and WINS (Windows Internet Naming Service) Install protocols on Windows XP clients...

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Networking Standards and the  OSI Model Identify organizations that set standards for networking. Describe the purpose of the OSI Model and each of its layers Explain specific functions belonging to each OSI Model layer Understand how two network nodes communicate through the OSI model Discuss the structure and purpose of data packets and frames. Describe the two types of addressing covered by the OSI Model.

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This diagram illustrates the Physical layer (Layer 1) of the OSI model. The Physical layer is responsible for the ultimate transmission of data over network communications media. It operates with data in the form of bits that are sent from the Physical layer of the sending (source) device and received at the Physical layer of the destination device. Ethernet cabling, Token Ring network technology and SCSI all function at the Physical layer of the OSI model. Hubs and other repeaters are standard network devices that function at the Physical layer.

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The Data-Link layer is the protocol layer in a program that handles the moving of data in and out across a physical link in a network. The Data-Link layer is layer 2 in the Open Systems Interconnect (OSI) model for a set of telecommunication protocols.The Data-Link layer ensures that an initial connection has been set up, divides output data into data frames, and handles the acknowledgements from a receiver that the data arrived successfully. It also ensures that incoming data has been received successfully by analyzing bit patterns at special places in the frames....

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Explain the role of Physical layer protocols and services in supporting communication across data networks.

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CÂU 1: Lớp nào (Layer) trong mô hình OSI chịu trách nhiệm mã hoá (encryption) dữ liệu? A) Application B) Presentation C) Session D) Transport CÂU 2: Hãy chọn các bước hợp lý được thực hiện trong quá trình đóng gói dữ liệu (encapsulation)? A) Datasegmentspacketsframesbits B) Datapacketssegmentsframesbits C) Dataframessegmentspacketsbits D) Datasegmentsframespacketsbits

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