Download Section 5A

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