network operating systems versus operating systems computer networks
TRANSCRIPT
Network Operating Systems versus Operating
SystemsComputer Networks
Network Operating System (NOS)
NOS have dedicated servers Client server networksServers provide a variety of services for
other computers on the network
Operating System (OS)
Networks that don’t use NOS are peer-to-peer networks
Consists of client computersClient computers can also perform specific
server functions if they use special server software
File Sharing Peer-to-Peer (P2P)
Networked computers in a peer-to-peer LAN network can share:◦Hard drives◦File folders◦Internet access◦Network resources such as printers and fax
machines◦Examples, household, small office, students
Sharing on the Internet P2P
GlobalSharing on the web requires a special
software client like Napster, BitTorrent, etc.
Everything in the shared file is shared with other users
You don't see the names of users on the web
Security Methods (P2P)
Workgroups◦ Share files with others in the same workgroup◦ Password protected
Passwords◦ File security is the responsibility of the end user◦ Can set access rights to specific files and folders
Permissions– Read only, see but not edit– Write only/change, read, edit or add– Read and Write or Full access (edit or
delete)
Client Server/Dedicated Server
Has at least one computer that works only as a server
Run on a network operating system, such as Windows Server 2003 or 2008, linux or Unix
Types of servers
Web (HTTP) serverEmail serverProxy server (controls the entrance to a
LAN from the Internet and responsible for controlling IP addresses)
File serverApplication server (software programs)
Roaming Authentication
Log into any machine on the LAN and access same files and system settings, protected with a password
Network Address Translation
Proxy server is LAN gateway to InternetProtects the internal LAN by using two
different IP addresses: a public address that the Internet can see and a private one used on the LAN
The ISP (Internet Service Provider) provides the IP address(es) for the Internet
Proxy Server (using DHCP) assigns a different IP address for each computer on the LAN
Domain Name System (DNS)
On the Internet DNS stores the names for websites (google.com) and the web addresses that are linked to them
Translates the domain name into an IP address and finds the web host that stores the files
Windows Internet Naming System
Within a LAN, the comparable naming service is WINS
Names individual computer using NetBIOS: example “Laura’s Computer”
Mapping a Shared Drive
In a peer-to-peer network, if someone shuts his computer down, his files will no longer be available for others.
One benefit of using a client/server network is that files will always be available so long as the server is running.
When working off a server, you can also mount a shared network drive, so that it shows up under My Computer as if it were on the local machine.
IP Config Command
Using Command Prompt IP Congig will find the computer’s IP address
It will also show subnet masks that are assigned to different departments or sections