ch 8
TRANSCRIPT
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Telecomm, Networks &
the Internet
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Trend in communication• Telephones,• Internet,• Wi-fi,• fiber optics,
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Components of simple network:
1. Switch,2. Hub,3. Router,4. Modem,5. Cable Wirings,6. Network Interface card,7. Network Operating System.
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Key-Digital Networking Technologies:
Client Server
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Packet Switching
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TCP/IP and Connectivity
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Physical Transmission of Data
Twisted Pair:
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Coaxial Cable:
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Fiber Optics:
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Wireless Transmission:
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Types of Networks:1. LAN (Local Area Network), CAN(Campus A N)
Less covering area,Less transmission Speed,Used for few numbers of autonomous computers,Max Speed is 10Mbps.
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2. MAN (Metropolitan Area Networks)More covering area than LAN,Can connect different cities,
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3. WAN (Wide Area Networks)covers entire world networks,connects the continents and countries.
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The DOMAIN name system:
• What Internet users use to reference anything by name on the Internet
• The mechanism by which Internet software translates names to addresses and vice versa
d a ko ta
w e s t
to rna do
e a st w w w
n o m in um m e ta in fo
com
b e rke ley n wu
e du g ov
n a to
in t
a rm y
m il
uu
n e t o rg
""
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ping www.nominum.com.
The Resolution Process
• Let’s look at the resolution process step-by-step:
annie.west.sprockets.com
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What’s the IP address of
www.nominum.com?
The Resolution Process• The workstation XYZ asks its configured name
server, dakota, for www.nominum.com’s address
ping www.nominum.com.annie.west.sprockets.com
dakota.west.sprockets.com
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The Resolution Process• The name server dakota asks a root name server, m, for
www.nominum.com’s address
ping www.nominum.com.annie.west.sprockets.com
m.root-servers.net
dakota.west.sprockets.com
What’s the IP address of
www.nominum.com?
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Copyright © 2001, Nominum, Inc.
The Resolution Process• The root server m refers dakota to the com name servers• This type of response is called a “referral”
ping www.nominum.com.annie.west.sprockets.com
m.root-servers.net
dakota.west.sprockets.com Here’s a list of the com name servers.
Ask one of them.
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Copyright © 2001, Nominum, Inc.
The Resolution Process• The name server dakota asks a com name server,
f, for www.nominum.com’s address
ping www.nominum.com.annie.west.sprockets.com
m.root-servers.net
dakota.west.sprockets.com
What’s the IP address of
www.nominum.com?
f.gtld-servers.net
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Copyright © 2001, Nominum, Inc.
The Resolution Process• The com name server f refers dakota to the
nominum.com name servers
ping www.nominum.com.annie.west.sprockets.com
f.gtld-servers.net
m.root-servers.net
dakota.west.sprockets.com
Here’s a list of the nominum.com name servers.
Ask one of them.
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The Resolution Process• The name server dakota asks an nominum.com name
server, ns1.sanjose, for www.nominum.com’s address
ping www.nominum.com.annie.west.sprockets.com
f.gtld-servers.net
m.root-servers.net
dakota.west.sprockets.com
ns1.sanjose.nominum.net
What’s the IP address of
www.nominum.com?
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The Resolution Process• The nominum.com name server ns1.sanjose
responds with www.nominum.com’s address
ping www.nominum.com.annie.west.sprockets.com
f.gtld-servers.net
m.root-servers.net
dakota.west.sprockets.com
ns1.sanjose.nominum.netHere’s the IP address for
www.nominum.com
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Here’s the IP address for
www.nominum.com
The Resolution Process• The name server dakota responds to annie with
www.nominum.com’s address
ping www.nominum.com.annie.west.sprockets.com
f.gtld-servers.net
m.root-servers.net
dakota.west.sprockets.com
ns1.sanjose.nominum.net
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INTRANET vs. EXTRANET
Intranet: An intranet is a private network that is contained within an enterprise. It may consist of many interlinked local area networks.
Ranges up to some meters.
Ex: intercom in organization.
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Corporate Intranet
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• Extranet: An extranet is a private network that uses Internet technology and the public telecommunication system to securely share part of a business's information or operations with suppliers, vendors, partners, customers, or other businesses.
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Virtual Private Networks:• is a method of computer networking--typically
using the public internet--that allows users to privately share information between remote locations, or between a remote location and a business' home network.