This study focuses on the future direction in wireless/mobile telecommunications as a standalone concept for building wireless IP systems, including commercial, campus, local and global networks. It examines the integration of the Internet and mobile networks, which are merging as a result of global demand for seamless mobile communication.
Định nghĩa DNS Thuật ngữ trong DNS Kỹ thuật phân giải
Định nghĩa Domain Name System(DNS)
Nhiệm vụ cơ bản nhất của DNS là đổi hostname thành IP address Ví Dụ: Đổi “en.wikipedia.org”,thành địa chỉ IP_”66.230.200.
Internetworking: an overview of concepts, terminology, and technology underlying the TCP/IP Internet protocol suite and the architecture of an internet. Talking about computer networks often means talking about Unix. Of course, Unix is not the only operating
system with network capabilities, nor will it remain a frontrunner forever, but it has been in the networking business
for a long time, and will surely continue to be for some time to come.
For some years, commentators have been predicting the 'convergence' of the Internet and
mobile industries. But what does convergence mean? Is it just about mobile phones providing
Internet access? Will the coming together of two huge industries actually be much more about
collision than convergence? In truth, there are lots of possibilities about what convergence
might mean, such as:
• Internet providers also supply mobile phones - or vice versa, of course.
• The user's mobile phone is replaced with a palmtop computer.
• The mobile Internet leads to a whole range of new applications.
The growth of the Internet, which I have been involved in, and the growth of mobile
telephone services, which NTT DoCoMo has been a leader in, have been peculiarly interlinked
and at the same time separate. The Internet is a lab experiment that broke free, and
finds itself in a world of its own contriving, which it often does not understand. The mobile
telephone world was developed for commercial purposes, and is in many respects the son of
its father, the wired telephone system.
Trong đề án tốt nghiệp về đề tài “Xây dựng Firewall & IPS trên Checkpoint”. Tôi đã
nghiên cứu về sản phẩm Checkpoint, các tính năng quản lí cũng như bảo mật bằng IPS
(Intrusion Prevention Systems). Khác với phiên bản R65, phiên bản R70 đã có nhiều
cải tiến trong giao diện cũng như tính năng nhằm cung cấp một môi trường làm việc
hiệu quả hơn cho người quản trị hệ thống.
As you might imagine, Teach Yourself TCP/IP in 14 Days provides a rapid introduction to the TCP/IP protocols and to a few commonly used applications that are built on top of them. The discussion is very lucid and emphasizes the fundamental concepts behind a given protocol; it does a good job of not letting the mass of details obscure the reasoning. Each section ends with a quiz and series of questions (and answers), so you can test your knowledge of each topic. The book also includes useful sections on sample installations and a nice discussion of sockets. As an added...
An Introduction to 3G Networks
What exactly are 3G networks? 3G is short for Third Generation (Mobile System). Here is a quick run-down: † 1G, or ﬁrst generation systems, were analogue and offered only a voice service – each country used a different system, in the UK TACS (Total Access Communications System) was introduced in 1980. 1G systems were not spectrally efﬁcient, were very insecure against eavesdroppers, and offered no roaming possibilities (no use on holidays abroad.)....
The majority of successful attacks on computer systems via the Internet can be traced to exploitation of security flaws in software and operating systems. These few software vulnerabilities account for the majority of successful attacks, simply because attackers are opportunistic – taking the easiest and most convenient route. They exploit the best-known flaws with the most effective and widely available attack tools.
Domain Name System (DNS)is a hierarchical, distributed database that contains mappings of DNS domain names to various types of data, such as IP addressesDomain Name System (DNS)is a hierarchical, distributed database that contains mappings of DNS.InterNIC is responsible for delegating administrative responsibility for portions of the domain namespace and for registering domain names.
IP for 3G
In this ﬁnal chapter, it is appropriate to revisit the theme that started the book. Chapter 1 outlined some of the reasons why IP should be introduced into 3G networks; this chapter will explain in greater detail the technicalities of how IP could be introduced. One result will be that a network is developed that is much more faithful to the original ‘Martini’ vision than current 3G incarnations.
This paper describes an architecture for differentiation of Quality of Service in heterogeneous wireless-wired networks. This architecture applies an “all-IP” paradigm, with embedded mobility of users. The architecture allows for multiple types of access networks, and enables user roaming between different operator domains.
How hosts tell routers about group membership
Routers solicit group membership from directly connected hosts
RFC 1112 specifies first version of IGMP
RFC 2236 specifies current version of IGMP
IGMP v3 enhancements
Supported on UNIX systems, PCs, and MACs
This chapter will provide an overview of IP mobility. It aims to be pretty selfcontained, and so should stand alone fairly independently of the other chapters. IP mobility is very important, because it is predicted that the vast majority of terminals will be mobile in a few years and that the vast majority of trafﬁc will originate from IP-based applications. The challenge of ‘IP mobility’ is to deliver IP-based applications to mobile terminals/users, even though, traditionally, IP-protocols have been designed with the assumption that they are stationary...
An Introduction to IP Networks
The Internet is believed by many to have initiated a revolution that will be as far reaching as the industrial revolution of the 18th and 19th centuries. However, as the collapse of many ‘dot.com’ companies has proven, it is not easy to predict what impact the Internet will have on the future. In part, these problems can be seen to be those normally associated with such a major revolution.
In these exercises, you will explore some basic multicast concepts via simple IP
multicast applications that have been in usage for several years and are known as
Mbone tools. The Mbone was the original implementation of IP multicast on the
Internet. In these exercises all the hosts (your PCs) are connected to the same
LAN—no multicast routing is needed at this stage.
This document describes the products and features used to build an IP telephony system, and it gives
recommendations on how to combine those elements into an effective solution for your enterprise.
However, this document does not contain specific implementation or configuration details for the
products and features. For details about a particular product or feature, refer to the technical
documentation available online at Cisco.com. (See Obtaining Documentation, page xv.)
Decision support systems (DSS) have evolved over the past four decades from
theoretical concepts into real world computerized applications. DSS architecture contains
three key components: a knowledge base, a computerized model, and a user interface. DSS
simulate cognitive decision-making functions of humans based on artificial intelligence
methodologies (including expert systems, data mining, machine learning, connectionism,
logistical reasoning, etc.) in order to perform decision support functions.
This document serves as an implementation guide for Cisco AVVID (Architecture
for Voice, Video and Integrated Data) networks based on Cisco CallManager
Release 3.0(5). With such a high level of industry interest regarding IP telephony,
customers are aggressively pursuing Cisco solutions for both large and small
networks. Solutions based on Cisco CallManager Release 3.0(5) allow Cisco to
deliver large-scale IP telephony systems with many capabilities.