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© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-1 Building a Simple Network Exploring the Functions of Networking
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-2 What Is a Network?
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-3 Common Physical Components of a Network
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-4 Interpreting a Network Diagram
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-5 Resource-Sharing Functions and Benefits Data and applications Resources Network storage Backup devices
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-6 Network User Applications (Outlook, POP3, Yahoo, and so on) Web browser (IE, Firefox, and so on) Instant messaging (Yahoo IM, Microsoft Messenger, and so on) Collaboration (Whiteboard, Netmeeting, WebEx, and so on) Databases (file servers)
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-7 Impact of User Applications on the Network Batch applications –FTP, TFTP, inventory updates –No direct human interaction –Bandwidth important, but not critical Interactive applications –Inventory inquiries, database updates. –Human-to-machine interaction. –Because a human is waiting for a response, response time is important but not critical, unless the wait becomes excessive. Real-time applications –VoIP, video –Human-to-human interaction –End-to-end latency critical
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-8 Characteristics of a Network Speed Cost Security Availability Scalability Reliability Topology
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-9 Physical Topology Categories
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-10 Logical Topologies
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-11 Bus Topology All devices receive the signal.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-12 Star Topology Transmission through a central point. Single point of failure.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-13 Extended-Star Topology More resilient than star topology.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-14 Ring Topology Signals travel around ring. Single point of failure.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-15 Dual-Ring Topology Signals travel in opposite directions. More resilient than single ring.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-16 Full-Mesh Topology Highly fault-tolerant Expensive to implement
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-17 Partial-Mesh Topology Trade-off between fault tolerance and cost
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-18 Connection to the Internet
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-19 Summary A network is a connected collection of devices that can communicate with each other. Networks carry data in many kinds of environments, including homes, small businesses, and large enterprises. There are four major categories of physical components in a computer network: the computer, interconnections, switches, and routers. Networks are depicted graphically using a set of standard icons. The major resources that are shared in a computer network include data and applications, peripherals, storage devices, and backup devices. The most common network user applications include , web browsers, instant messaging, collaboration, and databases. User applications affect the network by consuming network resources.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-20 The ways in which networks can be described include characteristics that address network performance and structure: speed, cost, security, availability, scalability, reliability, and topology. A physical topology describes the layout for wiring the physical devices, while a logical topology describes how information flows through a network. In a physical bus topology, a single cable effectively connects all the devices. In a physical star topology, each device in the network is connected to the central device with its own cable. When a star network is expanded to include additional networking devices that are connected to the main networking device, it is called an extended-star topology. Summary (Cont.)
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-21 Summary (Cont.) In a ring topology, all the hosts are connected in the form of a ring or circle. In a dual-ring topology, there are two rings to provide redundancy in the network. A full-mesh topology connects all devices to each other; in a partial-mesh topology, at least one device has multiple connections to all other devices. There are three common methods of connecting the small office to the Internet: DSL using the existing telephone lines, cable using the CATV infrastructure, and serial links using the classic digital local loops.
© 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.0—1-22
INTRODUCTION TO COMPUTER NETWORKS Zeeshan Abbas. Introduction to Computer Networks INTRODUCTION TO COMPUTER NETWORKS.
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Network Topology Physical & Logical Topology Bus Topology Ring Topology Star Topology Tree Topology Mesh Topology Combined Topologies.
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Shape of a Network. Topology The way the computers are cabled together The way the computers are cabled together Four different layouts Four different.
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Wireless network Usually use Radio Frequency (RF) technology –transmit and receive data over the air Adv : –providing all the features of wired LAN –without.
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Objectives: Chapter 1: Introduction Types of Networks OSI Reference Model (7 Layers) TCP/IP Model Network Devices Network Topologies.
1 CP2073 Networking Lecture 5. CP2073 Networking 2 Introduction 8Physical and Logical Topologies 8Topologies 8Bus 8Ring 8Star 8Extended Star 8Mesh 8Hybrid.
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