Ch 8

Telecomm, Networks &

the Internet

Trend in communication• Telephones,• Internet,• Wi-fi,• fiber optics,

Components of simple network:

1. Switch,2. Hub,3. Router,4. Modem,5. Cable Wirings,6. Network Interface card,7. Network Operating System.

Key-Digital Networking Technologies:

Client Server

Packet Switching

TCP/IP and Connectivity

Physical Transmission of Data

Twisted Pair:

Coaxial Cable:

Fiber Optics:

Wireless Transmission:

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.

2. MAN (Metropolitan Area Networks)More covering area than LAN,Can connect different cities,

3. WAN (Wide Area Networks)covers entire world networks,connects the continents and countries.

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

""

ping www.nominum.com.

The Resolution Process

• Let’s look at the resolution process step-by-step:

annie.west.sprockets.com

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

The Resolution Process• The name server dakota asks a root name server, m, for

www.nominum.com’s address


m.root-servers.net



www.nominum.com?

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”


m.root-servers.net

dakota.west.sprockets.com Here’s a list of the com name servers.

Ask one of them.


The Resolution Process• The name server dakota asks a com name server,

f, for www.nominum.com’s address


m.root-servers.net



www.nominum.com?

f.gtld-servers.net


The Resolution Process• The com name server f refers dakota to the

nominum.com name servers


f.gtld-servers.net

m.root-servers.net


Here’s a list of the nominum.com name servers.

Ask one of them.

The Resolution Process• The name server dakota asks an nominum.com name

server, ns1.sanjose, for www.nominum.com’s address


f.gtld-servers.net

m.root-servers.net


ns1.sanjose.nominum.net


www.nominum.com?

The Resolution Process• The nominum.com name server ns1.sanjose

responds with www.nominum.com’s address


f.gtld-servers.net

m.root-servers.net


ns1.sanjose.nominum.netHere’s the IP address for

www.nominum.com

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


f.gtld-servers.net

m.root-servers.net


ns1.sanjose.nominum.net

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.

http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212644,00.html

http://searchwinit.techtarget.com/sDefinition/0,,sid1_gci212065,00.html

Corporate Intranet

• 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.

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.

Ch 8

Technology

Transcript of Ch 8