Transcript Networks
INF550/NZDB550
Questions
What does networking mean to you?
What types of networks do you know about?
What does PAN, MAN, LAN, WLAN, WAN mean?
In a Nutshell
System that uses communication media
To connect computers and other devices
So that data and information can be transmitted
between them
Terminology
Nodes
Any device connected to a network
Client
A node which requests and uses resources available from
other nodes
Fat Client – operates as independent computer
Thin Client – no local storage and limited processing power
Server
A node that shares resources with other nodes
Directory Server - Manages users
Web Server – provides the web pages
Print Server – manages printing
File Server – managers files, software and network operations
Host
Large centralised computer
Switch
Central node for other nodes
Allows nodes to communicate with multiple other
nodes
NIC
Network Interface Card
Connects the computer to a network
Allows each node to be identified (MAC address)
Ethernet Local Area Network
LAN and WLAN
Local Area Network and Wireless LAN
Limited geographical area
Often within a building
Used for home networking
Every device can communicate with every other device
NMIT has a number of LANS for different reasons
Campus wide
Student WiFi
Staff WiFi
TALOS for IT students and tutors
WAN
Wide Area Network
Cover large geographical areas
Typically connect multiple LANS
The Internet is an example of a WAN
Contains routers to route messages
Between a LAN and the Internet
Between several connected LANs
Across a WAN eg the Internet
Enterprise Networks
Multiple LANs and/or WANs
MAN
Metropolitan Area Network
Regional networks
Cover cities
Eg Wellington
Talk about one in Nelson
PAN
Personal Area Network
Small personal network
Around 1 person
Bluetooth
Different Types
Star
Each device is connected
to a switch
Devices communicate
with each other through
the switch
Most widely used
network topography
Tree or Hierarchical
Each device connected to
central node either
directly or through a
subordinate node
Useful in centralised
organisations
Mesh
Each node can be
connected to more than
one other node
Often used in wireless
networks
If physically wired, each
node has to have a
separate NIC for each
connection
Hybrid
Combination of different
topologies
Useful in large
organisations which have
a complex network of
smaller networks
Eg NMIT network is
made up of wired and
wireless networks
Activity
Networking Hands on Activity
Client/Server
Links 2 or more
computers together
Servers provide
computing services to
user PCs
User PCs may be thin or
thick clients
Eg server may be a web
server providing web
resources to the client
(user)
Peer-to-Peer Network
2 computers are linked
so they can access all of
the files on the other
computer
Type of Client/Server
Accessing unused
processing power
Eg SETI@home
File sharing
Eg BitTorrent
Terminal Server Network
Processing power in one
centralised computer
Often the terminals are
thin clients (dumb
terminals)
Remote Desktop
Services
Used by cloud services
where the terminal
server hosted on the
Internet