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Lecture Computer communications & networks: Chapter introdu ce - Forouzan

In this chapter, you will learn about network models, data & signals, digital transmission, transmission media, error detection & correction, data link control, wired LANs – ethernet, wireless LANs, network layer - logical addressing, internet protocols, network layer - delivery, forwarding, and routing, transport layer, switching & vlans, application layer.


Lecture Computer communications & networks: Chapter 31 - Forouzan

Chapter 31 - Network security. Network security can provide five services. Four of these services are related to the message exchanged using the network. The fifth service provides entity authentication or identification.


Lecture Computer communications & networks: Chapter 3 - Forouzan

One of the major functions of the physical layer is to move data in the form of electromagnetic signals across a transmission medium. Whether you are collecting numerical statistics from another computer, sending animated pictures from a design workstation, or causing a bell to ring at a distant control center, you are working with the transmission of data across network connections. Chapter 3 discusses the relationship between data, which are created by a device, and electromagnetic signals, which are transmitted over a medium.


Lecture Computer communications & networks: Chapter 4 - Forouzan

A computer network is designed to send information from one point to another. This information needs to be converted to either a digital signal or an analog signal for transmission. In this chapter, we discuss the first choice, conversion to digital signals.


Lecture Computer communications & networks: Chapter 29 - Forouzan

Chapter 29 discusses multimedia and a set of wiely-used application programs. These programs have generated new issues such as the need for new protocols in other layers to handle the specific problems related to multimedia. We briefly discuss these issues in this chapter.


Lecture Computer communications & networks: Chapter 10 - Forouzan

After explaining some ideas about data and signals and how we can use them efficiently, we discuss the characteristics of transmission media, both guided and unguided, in this chapter. Although transmission media operates under the physical layer, they are controlled by the physical layer.


Lecture Wireless and mobile computing – Chapter 20: Signal encodin techniques

The following will be discussed in this chapter: Differential encoding, modem functions, digital vs analog (advantages of digital over analog), binary amplitude shift keying (limitations), NRZ-L, QPSK Vs.OQPSK, QAM.


Lecture Wireless and mobile computing – Chapter 21: Spread spectrum

The following will be discussed in this chapter: Spread spectrum intro, spread spectrum model, pseudorandom sequences, pn sequence generator, frequency hopping spread spectrum, direct sequence spread spectrum, processing gain, DSSS using BPSK.


Lecture Wireless and mobile computing – Chapter 25: Coding and error control (Review/Recap)

Chapter 25 - Coding and error control (Review/Recap). The following will be discussed in this chapter: CRC Algorithms, ECC, block ECC, convolutional code, turbo codes (block +convolutional), ns2 intro and installation.


Lecture Wireless and mobile computing – Chapter 4: Transmission media

The following will be discussed in this chapter: Transmission media, transmission media classification, transmission media characteristics and design specifications, guided and unguided media, wireless transmission frequencies, antennas, wireless propagation.


Lecture Wireless and mobile computing – Chapter 1: Introduce

The following will be discussed in this chapter: What is wireless communication? Types of wireless communication, multiservice point-to-multipoint wireless network, electromagnetic radiation spectrum, wavelength of some technologies, types of electromagnetic carriers,...


Lecture Wireless and mobile computing – Chapter 22: Spread spectrum (Review/Recap)

The following will be discussed in this chapter: Relationship between bandwidth of a signal (before and after and encoding SS), benefits of SS, FHSS, slow and fast FHSS, DSSS, relationship between bit rate of a signal (before and after DSSS encoding), CDMA.


Lecture Wireless and mobile computing – Chapter 11: Communication networks

The following will be discussed in this chapter: LANs WANs differentiation, path reliability, circuit switching driven example network, circuit switching routing types, semi-permanent connection type, isdn review question, datagram and virtual circuit operational differentiation, limitations of circuit switching for data transmission, virtual channel and virtual path difference.


Lecture Computer communications & networks: Chapter 26 - Forouzan

Chapter 26 - Remote logging, electronic mail, and file transfer. Chapter 26 discusses three common applications in the Internet: remote login, electronic mail, and file transfer. A remote login application allows the user to remotely access the resources of a system. An electronic mail application simulates the tasks ofsnail mail at a much higher speed. A file transfer application transfers files between remote systems.


Lecture Computer communications & networks: Chapter 27 - Forouzan

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. Chapter 27 discuss the ideas and issues in the famous world wide web (WWW). It also briefly describes the client/server application program (HTTP) that is commonly used to access the web.


Lecture Computer communications & networks: Chapter 28 - Forouzan

Chapter 28 - Network management: SNMP. Chapter 28 is devoted to network management. We first discuss the general idea behind network management. We then introduce the client/server application, SNMP, that is used for this purpose in the Internet. Although network management can be implemented in every layer, the Internet has decided to use a client/server application.


Lecture Computer communications & networks: Chapter 12 - Forouzan

Although the previous chapters in this part are issues related to the physical layer or transmission media, Chapter 8 discusses switching, a topic that can be related to several layers. We have included this topic in this part of the book to avoid repeating the discussion for each layer.


Lecture Computer communications & networks: Chapter 13 - Forouzan

This chapter devoted to access control, the duties of the data link layer that are related to the use of the physical layer. The main contents of this chapter include all of the following: Random access, controlled access, channelization.


Lecture Computer communications & networks: Chapter 0 - Forouzan

In this lecture, students will be able to understand: introduction, network models, data & signals, digital transmission, transmission media, error detection & correction, data link control, wired LANs – ethernet, wireless LANs, network layer - logical addressing, internet protocols, network layer - delivery, forwarding, and routing, transport layer, switching & vlans, application layer.


Lecture Computer communications & networks: Chapter 2 - Forouzan

The two dominant networking models are the Open Systems Interconnection (OSI) and the Internet model (TCP/IP).The first is a theoretical framework; the second is the actual model used in today's data communications. In Chapter 2, we first discuss the OSI model to give a general background. We then concentrate on the Internet model, which is the foundation for the rest of the lecture.


Lecture Computer communications & networks: Chapter 11 - Forouzan

After explaining some ideas about data and signals and how we can use them efficiently, we discuss the characteristics of transmission media, both guided and unguided, in this chapter. Although transmission media operates under the physical layer, they are controlled by the physical layer.


Lecture Computer communications & networks: Chapter 32 - Forouzan

Chapter 32 - Security in the internet: IPSec, SSL/TLS, PGP, VPN, and Firewalls. Chapter 32 briefly discusses the applications of topics discussed in chapters 30 and 31 to the Internet model. We show how network security and cryptography can be used in three upper layers of the Internet model.


Lecture Computer communications & networks: Chapter 24 - Forouzan

Chapter 24 - Congestion control and quality of service. This chapter discuss two related topics: congestion control and quality of service. Although these two issues can be related to any layer, we discuss them here with some references to other layers.


Lecture Computer communications & networks: Chapter 25 - Forouzan

Chapter 25 discusses the Domain Name System (DNS). DNS is a client/server application that provides name services for other applications. It enables the use of applicationlayer addresses, such as an email address, instead of network layer logical addresses.


Lecture Computer communications & networks: Chapter 18 - Forouzan

In this chapter, we show how the virtual-circuit approach can be used in wide-area networks. Two common WAN technologies use virtual-circuit switching. Frame Relay is a relatively high-speed protocol that can provide some services not available in other WAN technologies such as DSL, cable TV, and T lines. ATM, as a high-speed protocol, can be the superhighway of communication when it deploys physical layer carriers such as SONET.


Lecture Computer communications & networks: Chapter 23 - Forouzan

Chapter 23 - Process-to-process delivery: UDP, TCP, and SCTP. Chapter 23 discusses three transport layer protocols in the Internet: UDP, TCP, and SCTP. The first, User Datagram Protocol (UDP), is a connectionless, unreliable protocol that is used for its efficiency. The second, Transmission Control Protocol (TCP), is a connection-oriented, reliable protocol that is a good choice for data transfer. The third, Stream Control Transport Protocol (SCTP) is a new transport-layer protocol designed for multimedia applications.


Lecture Computer communications & networks: Chapter 30 - Forouzan

In this chapter, we first introduce the security services we typically expect in a network. We then show how these services can be provided using cryptography. At the end of the chapter, we also touch on the issue of distributing symmetric and asymmetric keys.


Lecture Wireless and mobile computing – Chapter 32: Wireless LAN technology

The following will be discussed in this chapter: Wireless LAN Introduction, defining a WLAN, WLAN design goals, early wireless LANs, modern wireless LANs, pro and cons of WLAN, WLAN deployments, cross-building interconnect,...


Lecture Wireless and mobile computing – Chapter 9: Communication networks

The following will be discussed in this chapter: Wireless communication? Why use wireless communication? Wireless is different than wired why? Modern cellular standards, underlying concepts, enabling technologies, overview of wireless LANs, single cell LAN extension, nomadic access,...


Lecture Wireless and mobile computing – Chapter 19: Encoding techniques

The following will be discussed in this chapter: Data representation, signaling, encoding techniques, digital data, digital signals (line coding), advantages of digital transmission, disadvantages of digital transmission, signal elements vs. data elements, data rate vs. signal rate (bit rate vs. baud rate/pulse rate/modulation rate), unipolar encoding,…


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