Q1) What do you mean by Computer Network? Explain the types of Computer Network.
Q2) Write the advantage and disadvantage of Computer network.
Q3) Explain the transmission Media and it's types with diagram.
Q4) Write the difference between following:-
a) LAN and WAN b) Guided Media and Unguided Media
Q5) What do you mean by Network Topology? Explain its types.
Q6) Define the following Network devices:-
1) Modem 2) Repeater 3) Hub 4) Switch 5) Bridge 6) Router 7) Gateway 8) Network Card
Q7) What do you mean by Protocol? Explain the following types of Protocol.
Q8) Explain function of hub and router.
Ans:
Hub: A hub contains multiple ports. When a packet arrives at one port, it is copied to all the ports
of the hub. When the packets are copied, the destination address in the frame does not change to a
broadcast address. It does this in a rudimentary way, it simply copies the data to all of the Nodes
connected to the hub.
2. Router : routers are networking devices that forward data packets between networks using
headers and forwarding tables to determine the best path to forward the packets
Q9) Expand the following terms
(i) URL (ii) ISP (iii) DHTML (iv) CDMA
10) Wireless/Mobile Computing
Wireless communication is simply data communication without the use of landlines. Mobile
computing means that the computing device is not continuously connected to the base or central
network.
1. GSM(Global System for Mobile communication): it is leading digital cellular system.
In covered areas, cell phone users can buy one phone that will work any where the standard is
supported. It uses narrowband TDMA, which allows eight simultaneous calls on the same radio
frequency.
2. CDMA(Code Division Multiple Access): it is a digital cellular technology that uses
spread-spectrum techniques. CDMA does not assign a specific frequency to each user. Instead
,every channel uses the full available spectrum.
3. WLL(Wireless in Local Loop) : WLL is a system that connects subscribers to the public
switched telephone network using radio signals as a substitute for other connecting media.
4. Email(Electronic Mail): Email is sending and receiving messages by computer.
5. Chat: Online textual talk in real time , is called Chatting.
6. Video Conferencing: a two way videophone conversation among multiple participants is
called video conferencing.
7. SMS(Short Message Service): SMS is the transmission of short text messages to and
from a mobile pone, fax machine and or IP address.
8. 3G and EDGE: 3G is a specification for the third generation of mobile communication of
mobile communication technology. 3G promises increased bandwidth, up to 384 Kbps when a
device is stationary.
EDGE(Enhanced Data rates for Global Evolution ) is a radio based high speed mobile
data standard.
11) NETWORK SECURITY CONCEPTS
Protection methods
1 Authorization - Authorization confirms the service requestor's credentials. It determines if
the service requestor is entitled to perform that operation.
2 Authentication - Each entity involved in using a web service the requestor, the provider
and the broker(if there is one) - is what it actually claims to be.
3 Encryption – conversion of the form of data from one form to another form.
4 Biometric System - involves unique aspect of a person's body such as Finger-prints,
retinal patterns etc to establish his/her Identity.
5 Firewall - A system designed to prevent unauthorized access to or from a private network is called firewall. it can be implemented in both hardware and software or combination or both.
12) WEB SERVERS Terminology.
WWW (WORLD WIDE WEB)
It is a small part of Internet. It is a kind of Application of internet.It is a set of protocols that allows us
to access any document on the Net through a naming system based on URLS. Internet was mainly
used for obtaining textual information. But post-WWW the internet popularity grew tremendously
because of graphic intensive nature of www.
Attributes of WWW
(i) User friendly- www resources can be easily used with the help of browser.
(ii) Multimedia documents-A web page may have graphic, audio, video, and animation etc at a
time.
(iii) Hypertext and hyperlinks-the dynamic links which can move towards another web page is
hyperlink.
(iv) Interactive -www with its pages support and enable interactivity between users and servers.
(v) frame-display of more than one section on single web page.
Web server- It is a WWW server that responds to the requests made by web browers.
e.g. : Apache, IIS, PWS(Personal web server for Windows 98).
Web browser- It is a WWW client that navigates through the World Wide Web and displays web
pages. E.g.: FireFox Navigator, Internet Explorer etc.
Web sites- A location on a net server where different web pages are linked together by dynamic
links is called a web site. Each web site has a unique address called URL.
Web page - A document that can be viewed in a web browser and residing on a web site is a web
page.
Home page- a web page that is the starting page and acts as an indexed page is home page.
Web portal - that facilitates various type of the functionality as web site. for e.g.
www.yahoo.com,www.rediff.com
Domain name- An internet address which is a character based is called a Domain name. Some
most common domains are com, edu, gov, mil, net, org, and co.Some domain names are location
based also. For e.g. au for Australia, a for Canada, in for India etc.
URL- A URL (uniform resource locator) that specifies the distinct address for each resource on the
internet.e.g.http://encycle.msn.com/getinfo/stypes.asp
Web hosting - means hosting web server application on a computer system through which
electronic content on the internet is readily available to any web browser client.
HTML -
It stands for Hyper Text Markup Language that facilitates to write web document that can be
interpreted by any web browser. It provide certain tags that are interpreted by the browser how to
display and act with the text, graphics etc. tags are specified in <>.
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