Bca Question Paper Computer Network
Computer. Networks Multiple Choice Questions and Answers (MCQs) PDF download a book to practice quiz questions and answers on chapters: Analog transmission
Computer Networks
A computer network (Figure 10.2) is an interconnection among two or more computers or computing devices. Such interconnection allows computers to share data and
Basic Networking Concepts
-A network can be defined as a group of computers and other devices connected in some ways so as to be able to exchange data. -Each of the devices on the
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Apr 11 2020 Here are some of the things you will find in this book: An introduction to computer networking. What you need to set up a network The basics of.
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COMPUTER NETWORKS [R15A0513] LECTURE NOTES MALLA
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Where those designations appear in this book and the publisher was aware of a trademark claim
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Networking Fundamentals
What is a Network? • A network refers to two or more connected computers that can share resources such as data a printer
Basic Networking Concepts
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No part of this publication may be reproduced transmitted
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CURRICULUM OF COMPUTER SCIENCE SOFTWARE
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1 Introducing Basic Network Concepts
However this book will focus on computer networks—connecting computers and having them communicate with each other. Computer Networks. A computer network
Computer Networking first-step
21-Apr-2004 Who Ought to Read This Book. Stuff You'll Find in This Book. For More Information… Part I. Networking Basics. Chapter 1. What Is a Network?
Networking Fundamentals
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-2Objectives•Describe the function and operation of a hub, a switch and a
router•Describe the function and operation of a firewall and a gateway•Describe the function and operation of Layer 2 switching,Layer 3 switching, and routing•Identify the layers of the OSI model•Describe the functionality of LAN, MAN, and WAN networks•Identify the possible media types for LAN and WAN connections
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-3What is a Network?•A network refers to two or more connected computers that
can share resources such as data, a printer, an Internet connection, applications, or a combination of these resources. © 2006 Cisco Systems, Inc. All rights reserved.SMBUF-4Types of NetworksLocal Area Network (LAN)
Metropolitan Area Network (MAN)
Wide Area Network (WAN)
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-5WAN TechnologiesCircuit-switched
Asynchronous serial. ISDN Layer 1
TELEPHONE
COMPANY
Leased Line
Synchronous serial
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-6WAN Technologies (Cont.)Broadband Access
SERVICE
PROVIDER
Cable, DSL, Wireless WANFrame-Relay
Synchronous serial
SERVICE
PROVIDER
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-7Network Topologies: Bus TopologySEGMENT
TerminatorTerminator
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-8Network Topologies: Star Topology Hub © 2006 Cisco Systems, Inc. All rights reserved.SMBUF-9Network Topologies:Extended Star Topology
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-107654321The OSI Model - Why a Layered Network Model?
•Reduces complexity•Standardizes interfaces•Facilitates modular engineering•Ensures interoperable technology•Accelerates evolution•Simplifies teaching and learning
ApplicationPresentation
SessionTransportNetworkData LinkPhysical
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-11The Seven Layers of the OSI ModelApplication Layers (Upper
Layers):•Network Processes to Applications•Data Representation•InterHost Communication
7654321
ApplicationPresentation
SessionTransportNetworkData LinkPhysical
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-12 7654 321
ApplicationPresentation
SessionTransportNetworkData LinkPhysical
The Seven Layers of the OSI Model (Cont.)
End To End Connections:•Handles transportation issues between hosts•Ensures data transport reliability•Establishes, maintains and terminates virtual circuits•Provides reliability through fault detection and recovery•Information flow control
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-137654321
ApplicationPresentation
SessionTransportNetworkData LinkPhysical
The Seven Layers of the OSI Model (Cont.)
Data Delivery:•Provides connectivity and pathselection between two host systems•Routes data packets•Selects best path to deliver data•The Network layer prioritizes data known as Quality of Service (QoS)
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-147654321
ApplicationPresentation
SessionTransportNetworkData LinkPhysical
The Seven Layers of the OSI Model (Cont.)
Access to Media:•Defines how data is formatted for transmission and how access to the network is controlled
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-157654321
ApplicationPresentation
SessionTransportNetworkData LinkPhysicalThe Seven Layers of the OSI Model (Cont.)Binary Transmission:•Defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-16Twisted-PairCoaxial
Outer jacket
BNCConnectorCopper Conductor
Braided Copper Shielding
Plastic Insulation
Fiber Optics
Outer jacket
Plastic Shield
Glass and Fiber Cladding
Kevlar Reinforcing Material
SCConnectorOuter jacket
Twisted-Pair
Color-Coded Plastic Insulation
RJ-45Connector
Physical Media Types
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-17Wireless
Physical Media Types (Cont.)
EI Q 0Q&PYH"&H"
ETHERNET BACKBONE
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-18Physical Media ComparisonTwisted Pair
Coaxial
Fiber Optic
Wireless
LANBandwidth
Up to 1 Gbps 10-100 MbpsUp to
10 Gbps
or higherUp to54 Mbps
Distance
Up to 100 m Up to 500 m Up to 60 kmUp to 100 m
Price Least expensiveInexpensiveMost expensiveModerate© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-19Hub or Repeater•A hub (concentrator) is a device that repeats the signals it
receives on one port to all other ports. It is a central connection point for several network devices. Hub © 2006 Cisco Systems, Inc. All rights reserved.SMBUF-20Hub (Multiport Repeater) © 2006 Cisco Systems, Inc. All rights reserved.SMBUF-21Network Interface Card© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-22WAN - Physical Layer Implementations•Physical layer implementations vary•Cable specifications define speed of link
Cisco HDLC PPP Frame RelayISDN BRI (with
PPP)DSL Modem
Cable ModemEIA/TIA-232
EIA/TIA-449
X.21 V.24 V.35
HSSI RJ-48Note: ISDN BRI cable
pinouts are different than the pinouts for Ethernet.The RJ-48 and RJ-45
look the same, but the pinouts are different. RJ-11Note: Works
over telephone line BNCNote: Works
over CableTV line
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-23 WANPhysical Media
Wall Jack
© 2006 Cisco Systems, Inc. All rights reserved.SMBUF-24Data Link Layer•Data Link layer protocols create, transmit, and receive
packets. This layer is also responsible for logical MAC addressing and LLC processing, creating logical topologies, and controlling media access. 2Data Link
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