Telecommunications And Network Security Pdf

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What Is Network Security?

Chapter 7. Telecommunications, the Internet, and Information System Architecture. The electronic transmission of information over distances, called telecommunications, has become virtually inseparable from computers: Computers and telecommunications create value together. Components of a Telecommunications Network. Telecommunications are the means of electronic transmission of information over distances.

The information may be in the form of voice telephone calls, data, text, images, or video. Today, telecommunications are used to organize more or less remote computer systems into telecommunications networks.

These networks themselves are run by computers. A telecommunications network is an arrangement of computing and telecommunications resources for communication of information between distant locations. A telecommunications network includes the following components:. Terminals for accessing the network. Computers that process information and are interconnected by the network. Telecommunications links that form a channel through which information is transmitted from a sending device to a receiving device.

Telecommunications equipment that facilitates the transmission of information. Telecommunications software that controls message transmission over the network. Scope of Telecommunications Networks. Two principal types of telecommunications networks can be distinguished from the point of view of their geographical scope. They are:.

Local area network LAN : is a privately owned network that interconnects processors, usually microcomputers, within a building or on a campus site that includes several buildings. Characteristics of a LAN: [Figure 7. LANs are the principal tool of workgroup computing.

LANs ensure high-speed communication within a limited area and enables the users to share facilities peripherals connected to it. Usually include a large-capacity, secondary storage device, where database and applications software are maintained, managed by a microcomputer acting as a file server that delivers data or program files to other computers. Facilities peripherals may include jukebox optical memory and fast printers.

Frequently, one of the facilities peripherals in a LAN is the gateway hardware and software that give the network users access to other networks.

More group members may connect to the network from remote sites using wireless telecommunications. LANs are generally composed of a network of microcomputers. Wide area network WAN : is a telecommunications network that covers a large geographical area.

Characteristics of a WAN: [Figure 7. The information system of an entire organization may be structured as a hierarchy.

The WANs system architecture looks very much like an organization chart. WANs connect all the divisional minicomputers to the headquarters mainframe with a variety of local microcomputers and terminals located at remote sites connected, in turn, to the minicomputers. WANs provide the backbone through which all other nodes computers and terminals communicate. WANs often use telecommunication links and equipment provided by specialized vendors, called common carriers.

WANs serve to interconnect multiple LANs and can make specific resources available to a large number of workstations. Metropolitan Area Networks MAN - are telecommunications networks that interconnect various local area networks within a metropolitan area, that is, within approximately a mile range. Purpose of MANs is to interconnect various LANs within a metropolitan area, that is, within approximately a 50 - mile range. Interorganizational Information Systems - are shared by two or more companies.

Characteristics of Interorganizational Information Systems : [Figure 7. These systems help several firms share information in order to coordinate their work, collaborate on common projects, or sell and buy products and services.

Internet has emerged as a global public network of networks. Some interorganizational systems are employed in knowledge work. Can be used to connect a firm's computers to the information systems of its customers, suppliers, and business partners, and are also used to execute business transactions. Telecommunications links may be implemented with various communication media, with a corresponding variety of characteristics. The main feature of a medium is its potential transmission speed, also known as channel capacity , which for data transmission purposes is expressed in bits per second bps.

An alternative measure of transmission channel capacity is bandwidth - the range of signal frequencies that can be transmitted over the channel. Six potential media are employed to implement telecommunication links:. Terrestrial Microwave. Satellite Transmission. Three of the above transmission media are classified as guided media - in which the signal moves along an enclosed path.

Guided media require wiring. They include:. Three of the above transmission media are classified as wireless media - the signal is broadcast radiated in many directions over the air or space and received through an antenna. Characteristics of Communications Media:. Twisted Pair a communications medium consisting of a pair of wires.

Coaxial Cable a communications medium that consists of a relatively thick central conductor shielded by several layers of insulation and the second conductor just under the cable's shell. Fiber Optics high-capacity communications medium that consists of many strands of pure glass with a data carrying core in the middle, surrounded by a reflective coating and a protective sheath.

Terrestrial Microwave long-distance telecommunications by means of microwave signals travelling on the surface of the earth. Satellite Transmission form of microwave transmission in which the signal is transmitted by an earth station to a satellite which rebroadcasts the signal to the receiving station. Radio Transmission wireless communications technology that transmits voice or data over the air using a lower frequency band than microwaves.

Note: Transmission speeds keep on rising, particularly in the fiber optics area. We are now moving toward a global infrastructure of gigabit-speed fiber optic links relying on digital transmission. In this multimedia environment, data, text, voice, images, and video will travel at speeds of billions of bits per second. Analog and Digital Communications [Figure 7. Most of the lines in the telephone systems of the world at present are analog. Signals are transmitted as continuous waves.

This is a satisfactory way to transmit voice, but digital data sent by computers sequences of pulses representing 0s and 1s must be converted into an analog signal for transmission over an analog line. The analog data must then be converted back into digital before entering the memory of the receiving computer. The conversion of data from digital form into analog for transmission and then back into digital at the receiving end is done by a pair of interface devices called modems mo dulator- dem odulator.

Modem-based telecommunications have created a significant bottleneck in an environment where computer and peripheral speeds have increased dramatically. Digital lines are capable of much faster communication and digital circuitry is now cheaper than analog. All the new equipment now installed in telephone networks is indeed digital.

Trend: There is a shift toward digital telecommunications is taking place throughout the world. A digital system for telecommunications, called TI carrier , is in wide use in parts of the telephone network. With the geographical distribution of information systems, increased volumes of transmission, and the move to multimedia, the costs of telecommunications are a significant business concern. Two principal methods of reducing these costs are:.

Multiplexing - the sharing of a high-capacity link by a number of transmissions. Signal Compression - using the link more efficiently by removing redundancies from the signal.

Characteristics of multiplexing:. There are economies of scale in telecommunications systems: the higher the system capacity, the lower the unit cost of transmissions. Many individual transmissions can share a physical channel through a variety of techniques collectively called multiplexing.

Multiplexing combines several lower-capacity transmissions into a single transmission, which is split at the receiving end. Signal Compression. Characteristics of signal compression:. Signal compression is the reduction of the need for channel capacity by removing redundancies from the signal.

To reduce the transmission needs, we can remove the redundancies at the sender site, transmit the compressed signal, and then restore the signal at the receiving end. Compression has an impressive effect on multimedia transmission needs. Computer networks differ in scope from relatively slow wide area networks, employed to transmit messages across vast geographic distances, to very fast local area networks that may connect computers located in the same building. System designers may select one of several arrangements for interconnecting network nodes, depending on an organization's requirement.

There are several ways to establish a connection between the sender and the receiver of a message. Computers, switches, and terminals interconnected by network links are collectively called nodes.

The purpose of network control is to provide a connection between nodes that need to communicate. The arrangement of nodes and links in a network is called a topology.

A variety of arrangements are possible, each with its own advantages and drawbacks. Network topology has to fit the structure of the organizational unit that will use the network, and this topology should also be adapted to the unit's communication traffic patterns and to the way the databases will be stored in order to facilitate access to them.

The following topologies are the most widely used:. Hierarchical Network. Hierarchical Network: [Figure 7. A corporate host computer often a mainframe , divisional minicomputers or powerful workstations, and workgroup support via micros.

A Review of Security Risks in the Mobile Telecommunication Packet Core Network

Our world is changing. As we enter a new era of connectivity, a new business reality is emerging. Our market-leading solutions equip service providers with autonomous, end-to-end telecom security — built in to each layer of the network and securing all connected things everywhere, all the time. Our security management solution, powered by advanced predictive analytics and offering increased actionable visibility, ensures that you can stay a step ahead of an increasingly dynamic threat environment. By making it easier for you to assemble, integrate and automate network security at massive scale, we will enable you to connect the enterprise of tomorrow. Welcome to our quest for easy.

Chapter 7. Telecommunications, the Internet, and Information System Architecture. The electronic transmission of information over distances, called telecommunications, has become virtually inseparable from computers: Computers and telecommunications create value together. Components of a Telecommunications Network. Telecommunications are the means of electronic transmission of information over distances. The information may be in the form of voice telephone calls, data, text, images, or video. Today, telecommunications are used to organize more or less remote computer systems into telecommunications networks.

Advances in information technology depend on the availability of telecommunication, network and mobile technologies. With the rapid increasing number of mobile devices being used as essential terminals or platforms for communication, security threats now target the whole telecommunication infrastructure that includes mobile devices, radio access network, and the core network operated by the mobile operators. In particular, the mobile core network is the most important part of the mobile communication system because different access networks are consolidated at the core network. Therefore, any risks associated with the core network would have a significant impact on the mobile network regardless of technologies of access networks are in use. This paper reviews the security risks in the mobile core network for data services by considering the confidentiality, integrity and availability CIA aspects, and then relates them to the ITU-T X. Unable to display preview.

Management activities associated with securing the network infrastructure are discussed later in the text in a section that covers the need to secure the data used.

Book:Network Security and Management

Network security is any activity designed to protect the usability and integrity of your network and data. If you're looking to increase protection for your remote employees so they can work from any device, at any time, from any location, get started with the Cisco Secure Remote Worker solution. Network security combines multiple layers of defenses at the edge and in the network. Each network security layer implements policies and controls. Authorized users gain access to network resources, but malicious actors are blocked from carrying out exploits and threats.

From Wikipedia, the free encyclopedia. The Wikimedia Foundation's book rendering service has been withdrawn. Please upload your Wikipedia book to one of the external rendering services.

The Telecommunications and Network Security domain encompasses the structures, techniques, transport protocols, and security measures used to provide integrity, availability, confidentiality and authentication for transmissions over private and public communication networks. Such is the definition that ISC 2 gives you as a starting point. We give you the detailed lowdown on this domain in Chapter 5. Its major topics include. Reviewing network architecture and design.

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5G the most secure foundation for digitalizing enterprises

Фонтейн пришел к выводу, что Стратмор в полном порядке, что он трудится на сто десять процентов, все так же хитер, умен и в высшей степени лоялен, впрочем - как. Лучшее, что мог сделать директор, - не мешать ему работать и наблюдать за тем, как коммандер творит свое чудо. Стратмор разработал план… и план этот Фонтейн не имел ни малейшего намерения срывать. ГЛАВА 75 Пальцы Стратмора время от времени касались беретты, лежавшей у него на коленях.

 - Периодическая таблица. Химические элементы. Видел ли кто-нибудь из вас фильм Толстый и тонкий о Манхэттенском проекте. Примененные атомные бомбы были неодинаковы.


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