Trong các bài trước chúng ta đã biết cách tạo User Profile và check mail từ Exchange Server với tùy chọn này nghĩa là bạn đang check mail bằng giao thức MAPI mà chỉ có khi cài Exchange mới có thể vận hành được.
Bằng chứng là ta không thể check mail được từ Exchange bằng các giao thức như IMAP, POP3, HTTP... vì mặc định sau khi cài đặt Exchange các giao thức này đã bị Disable. Vậy điểm khác biệt của các giao thức này là như thế nào?: - Với giao thức MAPI khi User check mail...
This guide is written for the person who will use Modicon Modbus protocols and messages for communication in Modicon programmable controller applications.It describes how messages are constructed, and how transactions take place using Modbus protocol.
This guide should be used in conjunction with Modicon user guides for the types of networks and programmable controllers present in the application. Familiarity with your network layout, and with your control application, is assumed.
Wireless Sensor Networks hold the promise of delivering a smart communication
paradigm which enables setting up an intelligent network capable of handling
applications that evolve from user requirements. With the recent technological
advances of wireless sensor network, it is becoming an integral part of our lives.
However, due to the nature of wireless sensor networks, researchers face new
challenges related to the design of algorithms and protocols.
Mobile telecommunications emerged as a technological marvel allowing for access to
personal and other services, devices, computation and communication, in any place and
at any time through effortless plug and play. This brilliant idea became possible as the
result of new technologies developed in the areas of computers and communications that
were made available and accessible to the user.
A Cisco 1841 router has the following interfaces:
Two Fast Ethernet interfaces: FastEthernet 0/0 and FastEthernet 0/1
Two serial interfaces: Serial 0/0/0 and Serial0/0/1
l The interfaces on your routers can vary.
Packet Tracer Activities are referenced throughout these chapters for
additional practices.Unlike most user PCs, a router will have multiple network interfaces.
l These interfaces can include a variety of connectors.
When you finish this chapter, you should: Be able to explain process-to-process communication, know the format of a UDP user datagram, be able to calculate a UDP checksum, understand the operation of UDP, know when it is appropriate to use UDP, understand the modules in a UDP package.
Chapter 11 - User data gramprotocol. Upon completion you will be able to: Be able to explain process-to-process communication, know the format of a UDP user datagram, be able to calculate a UDP checksum, understand the operation of UDP, know when it is appropriate to use UDP, understand the modules in a UDP package.
Chapter 20 - Electronic mail: SMTP, POP, and IMAP. In this chapter, we first study the general architecture of an e-mail system including the three main components: user agent, message transfer agent, and message access agent. We then describe the protocols that implement these components.
The World Wide Web (WWW) is a repository of information linked together from points all over the world. The WWW has a unique combination of flexibility, portability, and user-friendly features that distinguish it from other services provided by the Internet. The WWW project was initiated by CERN (European Laboratory for Particle Physics) to create a system to handle distributed resources necessary for scientific research. In this chapter we first discuss issues related to the Web. We then discuss a protocol, HTTP, that is used to retrieve information from the Web.`
The main contents of this chapter include all of the following: User agent (UA), addresses, delayed delivery, aliases, mail transfer agent (MTA), commands and responses, mail transfer phases, mime, mail delivery, mail access protocols.
The first three books in my Open Source Security series covered Nessus,
Snort, and Ethereal.The authors and I worked hard to make these books useful
to complete beginners, enterprise-scaled users, and even programmers who
were looking to enhance these tools. Giving programmers the capability to add
components to each tool was one focus of several. For example, I dissected a
preprocessor in the Snort 2.0 and 2.1 books and explained how you might
build another.To do that, I had to learn Snort’s inner workings by reading
much of the code.
In this chapter, we will introduce you to the tools you need in order to begin using
MATLAB effectively. These include the following: some relevant information on
computer platforms and software; installation protocols; how to launch MATLAB,
enter commands and use online help; a roster of MATLAB’s various windows; and
finally, how to exit the program. We know you are anxious to get started using MATLAB,
so we will keep this chapter brief. After you complete it, you can go immediately
to Chapter 2 to find concrete and simple instructions for using MATLAB to do
This book is intended for beginning through intermediate users and covers all the
protocols involved in TCP/IP. Each protocol is examined in a fair level of detail to show
how it works and how it interacts with the other protocols in the TCP/IP family. Along
the way, this book shows you the basic tools required to install, configure, and maintain
a TCP/IP network. It also shows you most of the user utilities that are available.
Lớp Giao vận trong mô hình tham chiếu DOD (xem Internet thật là đơn giản số 5/2003) cung cấp khả năng truyền thông từ một chương trình ứng dụng này tới một chương trình ứng dụng khác. Trong mục này, chúng ta sẽ nghiên cứu về 2 giao thức ở Lớp giao vận (Transport Layer): Giao thức TCP (Transport Control Protocol) và Giao thức UDP (User Datagram Protocol). Tất cả các gói tin được trao đổi giữa các máy tính trên mạng đều nhờ vào một trong 2 giao thức đó....
This paper first discusses the key issues that inhibit Voice over IP (VOIP) to be popular with the users. Then I discuss the
protocols and standards that exist today and are required to make the VOIP products from different vendors to
interoperate. The main focus is on H.323 and SIP (Session Initiation Protocol), which are the signaling protocols. We also
discuss some hardware standards for internet telephony.
Your corporate network equipment currently includes a 4006 Core switch with an L3 module for
VLAN routing and a Cisco 2600 external access router. Connected to your corporate network via
a 128k leased line is your branch network that includes a 2600 Cisco WAN router and a 2600XL
switch for local access. Your corporate network is segmented into four functional VLANs for
better network management. VLANs include “Accounting”, “Marketing” and “Engineering” for the
users and “default” used for the native VLAN network management.
Your network switching equipment currently includes a 4006 Core switch, 2900XL access switch
and a Cisco 2600 series external access router. Your network is segmented into four functional
VLANs for better network management. VLANs include “Accounting”, “Marketing” and
“Engineering” for the users and “default” used for the native VLAN network management. Inter-
VLAN routing has been implemented using a Layer-3 routing switch module for the 4006 to allow
individuals and servers on your Virtual LANs to exchange information.
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.
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)....