(i) The e-commerce system is operated on all days and all day.
(ii) It is able to conduct business 24 x 7.
(iii) People can interact with businesses at the time of their convenience.
(iv) Speed is a major advantage of E-Commerce.
(v) Advanced Electronic communications systems allow messages to reach across the world instantaneously
(vi) The Internet is too easy to 'shop around' for products and services that may be more cheaper and effective It provides an opportunity to bu at reduced costs.
(vii) It is possible to, explore the Internet, identify original manufacturers, thereby bypass wholesalers and achieve a cheaper price.
(viii) Customers can have a wide choice by comparing and evaluating the same product at different websites before making a purchase decision.
(ix) Customers can shop from home or anywhere at their convenience.
(x) Payments can also be made through online.

Network simulation
In a computer network, network simulation is a method whereby a software program models the activities of a network by calculating the communication between the different network objects such as(routers, nodes, switches, access points, links, etc.).
Network simulator
(i)  A network simulator is a software program that replicates the functioning of a computer network.
(ii) In simulators, the computer network is typically demonstrated with devices, traffic, etc. and the performance is evaluated.
Normally, users can then adapt the simulator to accomplish their precise analysis needs.
Network Parameters:
The network parameters define the state of the network (node placement, existing links) and the events (data transmissions, link failures, etc.).
Trace files:
A significant output of the simulation is the trace files. Trace files can document every incident that happened in the simulation and are used for examination.
NS2: NETWORK SIMULATOR version 2.
(i) It was considered explicitly for exploration in network communication and event-driven opensource simulator in computer.
(ii) OTCL and C++ used to create and run NS2.
(iii) NS2 works on Windows and Linux platforms that support wired or wireless network and also use the command line interface as a user interface.
API:
(i) API a pure event base software tool with super simulation design, it has more models which help the user to get desired output easily.

Step 1: Login to net banking account using unique user name and password provided by the bank earlier.
Step 2: Add the beneficiary as a payee to enable transfer of fund. The following details like Account Number, Name, IFSC about the beneficiary' are to be filled in the 'Add New Payee'section.
Step 3: Once the beneficiary is added, choose RTGS/ NEFT/ IMPS as mode of Fund Transfer.
Step 4: Select the account to transfer money from, select the payee, enter the amount to be transferred and add remarks (optional).
Step 5: Click on submit.
Step 6: Enter the OTPreceivedto mobile number linked to the corresponding account to complete the transaction.

1. Double click the Line tool from the toolbox. A Custom Stroke dialogue box appears.
2. Select the required Stroke style in the drop-down list box.
3. Then click OK button. Now the cursor changes to a crosshair.
4. Click and drag on the screen to draw your dotted line. As you drag, the line appears
5. Release the mouse button and the line will be drawn and selected, with sizing handles on either end. Resize the line by clicking and dragging the handles, if necessary.

Multimedia technologyis adopted by the libraries in various functions like multimedia kiosks, user orientation programs etc. Following is the brief account of multimedia technology applications in libraries.
1. Multimedia Kiosk
(i) Kiosk is a free-standing furnished equipped multimedia computer that allows users to retrieve information via a touch screen. It is commonly used in airports and other public locations to provide directions and few mandatory information's.
(ii) In an library, Kiosk is usually located nearthe entrance of the library, used for displaying announcements, reading lists, comments and suggestions from library users and other information's about operations and programs of the library.
2. Webcasting and Video Conferencing
(i) The live telecast of real time programs through internet is known as Webcasting.
(ii) Video conferencing isthe process of conducting conference between more than two participants at different sites by using computer networks to transmit audio and video data.
3. User Orientation Program
(i) The role of multimedia plays anvital role in training the librarians in schools, colleges and universities due to its interactivity. Hence, it is used in depth subject training to their faculties .
4. In-house Production of Multimedia Resources and E-publishing
(i) Many libraries produce multimedia resources in-house, to serve the parent organization.Introduction of CD/DVD and their writershas solved few of the problem of libraries in storing or achieving the materials.
(ii) Multimedia tools along with CD-writers is made possible to publish information from dlfferent sources in a most easy to use and acceptable form tolibrary users.
5. Digital Multimedia Libraries
(i) Information's are available indigital formats that include digital books, scann ed images, graphics and digitized audlo-visuat clips etc
(ii) Initially digital library projects were based only on textual data, later it was on all other media elements like images, audio and video recordings were also integrated under the collection of digital library.

(i)It is a process of taking down an E-Commerce site by sending continuous overwhelming request to its server .
(ii) This attack will be conducted from numerous unidentified computers using botnet. This attack will slow down and make the server inoperative.
(iii) DDoS attacks is also called as network flooding.

(i) To avoid the major disadvantage of Flat namespace, hierarchical namespace is used in large
(ii)  Hierarchical namespace is where the name is made up of several parts.
a. First part may represent the nature of the organization.
b. Second part may represent the name of the organization, and
c. Third part may represent the department of the organization and so on.
(iii) In this way the power to control the namespace can be decentralized.
(iv) The centralized authority can be given to nature and then to the name of the organization and so on.
(v) To achieve hierarchical namespace, Domain Name Space was designed.

(i)  The second generation of mobile systems was placed on digital transmission with GSM.
(ii) GSM stands for (Global System for Mobile communication) was most popular standard which is used in second generation, using 900MHl and 1800MHz for the frequency bands.
(iii) GSM mobile systems grown digital transmission using SIM. SIM stands for (Subscriber Identity Module) technology to authenticate a user for identification and bllling purposes and to encrypt the data to prevent listen without permission (eaves dropping).
(iv)  The transmission used as TDMA. TMDA stands for (Time Division Multiple Access) and CDMA One stands for (Code Division MultipleAccess ) method to increase the amount of information transported on the network.
(v) Mobility is supported at layer 2, which stops seamless roaming across assorted access networks and routing domains. This means each operator must cover the entire area or have agreements in place to permit roaming.

These social networks share several attributes in common:
Membership.
Social nets all generally requires user to register namesand accounts for avoid duplicate and secrecy so many public networks offer free registration, but some charge fees for their premium services. Private networks (such as BANK ACCOUNT HOLDERS groups) restrict registration to people who meet certain eligibility criteria.
Content contribution.
These networks allow members to easily share comments, movies, music, short films and/or photos with others.
Frequent return visits.
Healthy social net takes a centers around a base of members who check in regularly to contribute theirs and also for new updates.
Human relationship building.
The common goal of most social networks is allowing the interactions that build stronger connections with in communities of people

< ?php
＄n = "February";
switch(＄n) {
case "January":
echo "Its January";
break;
case "February":
echo "Its February";
break;
case "March":
echo "Its- March";
break;
case "April":
echo "Its April";
break;
case "May":
echo "Its May";
break;
case "June":
echo "Its June";
break;
case "July":
echo "Its July";
break;
case "August":
echo "Its August";
break;
case "September":
echo "Its September";
break;
case "October":
echo "Its October";
break;
case "November":
echo "Its November";
break;
case "December":
echo "Its December";
break;
default:
echo "Doesn't exist";
}
? >