Application Layer Services

Chapter summary: Bridges selectively relay packets between network segments, depending on their data-link layer destination addresses; bridges maintain a single broadcast domain and create separate collision domains; switches improve on the function of bridges by forwarding packets only to their destination systems;...and other contents.

16p tangtuy08 21-04-2016 41 3   Download

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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This chapter explain how the functions of the application layer, session layer, and presentation layer work together to provide network services to end user applications; describe how common application layer protocols interact with end user applications; describe, at a high level, common application layer protocols that provide Internet services to end-users, including WWW services and email;...

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Introduction Data link control layer – often abbreviated simply to data link layer – is concerned with the transfer of data over a serial data link The transmission mode may be either asynchronous or synchronous and based on either a character-oriented or a bit-oriented transmission control protocol The data link layer is fundamental to the operation of all data communication applications

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transport layer security service originally developed by Netscape version 3 designed with public input subsequently became Internet standard known as TLS (Transport Layer Security) uses TCP to provide a reliable end-to-end service SSL has two layers of protocols

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Security Service – a service provided by a protocol layer of communicating open systems, which ensures adequate security of the systems or of data transfers RFC 2828 – a processing or communication service that is provided by a system to give a specific kind of protection to system resources; security services implement security policies and are implemented bt security mechanisms.

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Application Layer Functionality and Protocols. In this chapter, you will learn to: 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. Describe the function of well-known TCP/IP applications, such as the World Wide Web and email, and their related services (HTTP, DNS, SMB, DHCP, SMTP/POP, and Telnet)....

51p thanhtung_hk 03-11-2010 121 28   Download

Cấu trúc NGN bao gồm 5 lớp chức năng: Lớp truy nhập dịch vụ (service access layer) Lớp truyền tải dịch vụ (service transport/core layer) Lớp điều khiển (control layer) Lớp ứng dụng/dịch vụ (application/service layer) Lớp quản lý (management layer) Lớp ứng dụng/dịch vụ Giao tiếp chuẩn Thành phần NGN Lớp điều khiển Giao tiếp chuẩn Mạng lõi Lớp quản lý Lớp chuyển tải dịch vụ vụ Thành phần có liên quan đến NGN Lớp truy nhập dịch vụ Thiết bị đầu cuối Hình 1.1: Cấu trúc lớp mạng của NGN. Lớp truy nhập dịch vụ: Bao gồm các thiết bị truy nhập...

10p minhloi7733 08-09-2010 220 104   Download

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

46p thangvu89 15-04-2010 212 36   Download

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. Describe the function of well-known TCP/IP applications, such as the World Wide Web and email, and their related services (HTTP, DNS, SMB, DHCP, STMP/POP, and Telnet). Describe file-sharing processes that use peer-to-peer applications and the Gnutella protocol.

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The data layer can be broken into three sublayers in most applications. They are the data storage layer, the data access layer, and the service agent, as shown in Figure 1-1. The data storage layer provides the mechanism for storing and managing your application data, and the data access layer provides the logic needed to retrieve and manipulate data.

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TCP/IP Quick Guide TCP Services UDP Services IRC Internet Relay Chat DCAP Data Link Switching Client Access Protocol DHCP Dynamic Host Configuration Protocol BOOTP Bootstrap Protocol NTP Network Time Protocol TFTP Trivial File Transfer Protocol ICP Internet Cache Protocol OSI MODEL Layer 7: Application Layer  HTTP HyperText Transfer Protocol Gopher TELNET Virtual Terminal POP3 Post Office Protocol Finger FTP File Transfer Protocol SMTP Simple Mail Transfer Protocol IMAP Internet Message Access Protocol NNTP Network News Transfer Protocol Defines interface to user pr...

4p thuancrazy02 15-12-2009 274 123   Download