Communication Networks Sharam Hekmat PragSoft Corporation www.pragsoft.com Contents Contents Preface 1. Introduction 1.1. Network Components 1.2. Network Types 1.3. The OSI Model 1.3.1. The Physical Layer 1.3.2. The Data Link Layer 1.3.3. The Network Layer 1.3.4. The Transport Layer 1.3.5. The Session Layer 1.3.6. The Presentation Layer 1.3.7. The Application Layer 1.4. Protocol Notations 1.4.1. Service Primitives 1.4.2. Sequence Diagrams 1.4.3. State Transition Diagrams 1.5. Standards
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operations do to first 4. What is a node on a network? Hardware connected to the network 5. Which physical topology has the inherent weakness of a single point of failure? Star 6. In a Web address, which part identifies the protocol being used? HTTP 7. What is basic to every networking standard? (Hint: relates to Documentation) Beyond the ideas in a standard, people must agree to a particular version of document 8. Why is the TCP/IP model divided into layers? The layers make TCP/IP easier
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Semester Two Journal and Study Guide CISCO SYSTEMS NETWORKING Academy CCNA 2 Chapter 1 WANs and Routers One major characteristic of a wide-area network (WAN) is that the network operates beyond the local LAN's geographic scope. It uses the services of carriers, such as regional Bell operating companies (RBOCs), Sprint, and MCI. WANs use serial connections of various types to access bandwidth over wide-area geographies. By definition, the WAN connects devices that are separated by wide areas. WAN
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NT1210 Introduction to Networking Unit 1: Mid-Term Mid Term Review 1 Nibble, Byte, Word, Double Word Nibble, Byte, Word, Double Word Figure 1-2 2 Kilobyte, Megabyte, Gigabyte, Terabyte Size (2N Bytes) Term Size (Bytes) Kilobyte Megabyte Gigabyte Terabyte 1024 1,048,576 1,073,741,824 1,099,511,627,776 Kilobyte, Megabyte, Gigabyte, Terabyte 210 220 230 240 Rounded by Size (Bytes) 1,000 1,000,000 1,000,000,000 1,000,000,000,000 Table 1-1 3 Random Access Memory (RAM) Physically exists
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OCR LEVEL 3 CAMBRIDGE TECHNICAL CERTIFICATE/DIPLOMA IN IT COMPUTER NETWORKS R/601/7320 LEVEL 3 UNIT 7 GUIDED LEARNING HOURS: 60 UNIT CREDIT VALUE: 10 COMPUTER NETWORKS R/601/7320 LEVEL 3 UNIT 7 AIM OF THE UNIT This unit aims to give the learners an understanding of the key components, the network protocols and the services provided by network systems. Learners will develop skills required to ensure network security, gain an understanding to the functions of hardware and software
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broken down into: 1. Physical connection – to a network is made by inserting a specialised expansion card 2. Logical connection – uses standards called protocols. (TCP/IP) 3. Applications – the application that interprets the data & displays the information in an understandable format is the last part of the connection. (FTP) • When selecting a NIC for a network, consider the following: 1. Type of network 2. Type of medium 3. Type of system
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| | | A(n) ____ model is a standard that provides a predefined framework for hardware and software developers who need to implement access control in their devices or applications. | | Selected Answer: | c. access control | | The most restrictive access control model is ____. | Selected Answer: | b. Mandatory Access Control | | | In the UAC dialog boxes, the color ____ indicates the lowest risk. | | Selected Answer: | c. gray | | The ____ model is the least restrictive
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1.9.2 WLAN (Wireless Local Area Network) Wireless LANs are categorized as per their configurations which are dependent on the type of application they are used for. The four general applications of wireless LANs are LAN extensions, building interconnections, adhoc networks and nomadic access. Wireless LANs are distinguished from their wired counterparts through their lower layer technologies in the OSI model representation. The differentiating layers are the data link layer and the physical layer
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uses to represent network devices and connections. Represents Icon Hub Bridge Switch Router Access point Network cloud Ethernet connection Serial Line connection Wireless connection Virtual Circuit The OSI Model As you study this section, answer the following questions: What is the OSI model and why is it important in understanding networking? How does the third OSI model layer relate to administering routers? Which OSI model layer is concerned
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3. Summary 4. Exam Essentials 5. Review Questions 4. Chapter 2: System Fundamentals 1. Exploring Network Topologies 2. Working with the Open Systems Interconnection Model 3. Dissecting the TCP/IP Suite 4. IP Subnetting 5. Hexadecimal vs. Binary 6. Exploring TCP/IP Ports 7. Understanding Network Devices 8. Working with MAC Addresses 9. Intrusion Prevention and Intrusion Detection Systems 10. Network Security 11. Knowing Operating Systems 12. Backups and Archiving 13. Summary 14. Exam Essentials 15
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