Transcript Section 5A

Section 7A
Introduction to Computers
Network
A group of connected computers that
communicate, exchange information
and share resources
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Benefits of Networks
Users access programs and data
simultaneously
Users share printers and scanners
Users communicate more easily
Users backup their data more easily
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File Server
A computer that stores data files for
networked users to access
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Two Kinds of File Access
Read-Only
Read/Write
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Levels of Access Rights or
Policies
Write access
Supervisor access
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Ways to Share Software on a
Network
Site license
Network version
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Shared Peripherals
Multiple users send print jobs to a
printer at the same time using spooling
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Personal Communications
E-mail
Teleconferences
Videoconferences
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Backup
The network manager makes regular
backups
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Two Types of Networks
Local area network (LAN)
Wide area network (WAN)
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Packet
Data is broken into small pieces--called
packets--before being transmitted
between networked computers
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Packet Parts
Header: has identifying information like
type of data; data source and
destination; and sequence number
Payload: has the transmitted data
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Protocol
Rules and formats for sending and
receiving data along the LAN
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Kinds of Protocols
TCP/IP
IPX/SPX
NetBEUI
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Ways to Connect Similar LANs
Hub
Bridge
Router
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Gateway Connects Different LANs
A gateway reads a packet header from
one type of network and then adds a
second header understandable by the
second network
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Other Networks
Campus Area Networks (CANs)
Metropolitan Area Networks (MANs)
Wide Area Networks (WANs)
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Node
A node is an individual computer on a
network
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Client/Server Networks
Individual computers share the
processing and storage workload with a
central server
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Peer-to-Peer Networks
Sometimes called a workgroup
Nodes share files and data with each other
vs. client/server networks, where nodes
share files and data only with the server
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Network Features
Topology: Physical or logical layout of
cables and devices that connect the
network nodes
Media: wires and cables that carry data
from source to destination
Bandwidth: amount of data media can
carry
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Kinds of Topologies
Bus topology
Star topology
Ring topology
Mesh topology
Wireless topology
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Kinds of Media
Twisted-pair cable
Coaxial cable
Fiber-optic cable
Wireless networks
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Network Technology
Network technology is the kind of
cabling equipment used to create a LAN
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Examples of Network
Technology
Ethernet
Fast Ethernet
Gigabit Ethernet
Token Ring
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Network Software
The group of programs that manages
the network resources is called the
network operating system (NOS)
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Examples of NOSs
Novell NetWare
Microsoft Windows NT Server
Microsoft Windows 2000
Microsoft XP
Microsoft .NET Server
Linux
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Section 7A
Networking Basics
Review Questions
What is a network?
What is a file server?
What is a node?
What’s the difference between a
client/server network and a peer-to-peer
network?
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