Server Controlled Multicast Chat System

Passwords should be designed to prevent them from being discovered by unauthorized persons. All passwords should have at least eight (8) characters. The user-IS should never be used as the password. Words in dictionary, derivates of user-IDs, and common character sequences such as “123456789” should not be employed.

But how does it work? The internet, based on the concept of “packet switching”, involves the travelling of small packets of data over one or more networks (Frenzel, 2013). This can be compared to “electronic postcards”, meaning that “a computer generates a piece of data and flings it into the net, just like the postal system, except 100 million times faster” (Cerf, 2013). This concept allows one computer to speak to many different computers around the network by sending out these “electronic postcards”. However, before these networks can work seamlessly together, they must use a common protocol, or set of rules for transmitting and receiving these packets of data. There are several protocols currently in use, including the OSI Model, the TCP/IP Model, UDP, HTTP, and FDP (Mitchell, 2014), but the most commonly used is Transmission Control Protocol/Internet Protocol (TCP/IP) (Gilmer, 2011). Even as early as 1977, TCP/IP was being used by other networks to link to ARPANET (Kozierok,

Text Chat. The text chat that was sent to a conference was received in the other conferences without perceivable delay. The text chat synchronization design is simple because it does not continuously monitor if there is text chat in each conference server. Rather when a text chat is received in any conference server, the conference server send it to the other conferences.

= y[0]-'0'; memset(&msg[0], 0, sizeof(msg)) ; if (Online>1) { cout << "Enter the id of the user you want to chat" << endl; fgets(kb_msg, MSG_SIZE+1, stdin); sprintf(msg, "%s", kb_msg); string y1(msg); int y2 = y1[0]-'0'; char * temp_point = &info[y2].ip[0]; other_client_fd = socket(AF_INET, SOCK_STREAM, 0); Friend_hostinfo = gethostbyname(temp_point); OClient_address.sin_addr

Remote desktop allows a user to enter in another computer on the user’s network. It allows to access data and applications, using the Remote Desktop Protocol

The OSI (Open System Interconnection) model is a set of specifications that allow computers around the world to openly communicate. It is pivotal to understanding and developing computer to computer communications in a network. Each layer plays a role in the process of sending and receiving data. The application layer is the top layer (layer seven) it promotes communication between programs and lower-layer network services. The services at this layer allow the network to decipher a program's request and the program to decipher data sent from the network. The Application layer protocols, programs handles formatting, procedure, security, synchronization, and any other requirements with the network. The Presentation Layer (layer 6) acts as a translator. For instance these protocols decode the jpg/jpeg files sent within the Web server’s HTTP response. So, in the last step (the Application layer) we enter the Web address and it took us to the Web site. This step allows us to see the images and content of the site. The Session Layer (layer 5) regulates and controls the communication between two nodes on the network. It is an ongoing exchange of data between the two and keeps the connection between them for the duration. It keeps the communication secure, detects whether or not the communication has been cut off and if it has it determines where to restart the

The User ID and Password will be provided to the user once the user completes the

- Since the client was not receiving the email Krista decided to create the client's username and had the client reset the password through the website.

Lock Service: The Lock Service is nothing but Chubby. The main usage of lock service is loosely-coupled distributed system. It also have large number of small machines which are intended to connect. The main purpose of lock service is to allow clients to communicate their activities and come to a common point about their environment. The important goals of lock service is reliability, availability to a large number of clients, and also provide easy-to-understand semantics. Chubby’s interface is similar to simple file system which performs file reads and

4 Protecting the pt info by logging off the computer every time the MA is away from the computer.

Describe the policies for remote user access and authentication via dial-in user services and Virtual Private Networks (VPN)

The maximum estimated number of users at any given time will be set as 10. Administrators will be given top priorities.

With the help of power or super access rights, these accounts are made stronger. The software gives the opportunity the separate the data for all different clients. The clients maintain their user account with three different variables. These are client ID, username and password. For each and every client, the default user account is different. Generally the production clients can change the default password, but generally it remains unchanged at the end of non-production system. Clients are available to install default system. This system is delivered standard password. To ensure the security of the system, the password has to be changed as soon as it finishes the installation process. It is also advisable to change in monthly interval. But R/3 service accounts and R/3 internal users should not be changed. The process is highly user friendly. Even the user can set his own minimum length of the password. Typically it varies between 3to 8 characters. The user can also set the time after which the password must be changed. If the user wants to keep the passwords without limits the default value has to be set as 0. All these facilities make the default user account

From the above code, we can tell how server send query to Database. But we can still guess to login without knowing the user’s passward by typing “bob’);-- “( space after the comment’--’ )

Mobile applications can be categorized into session-based applications and event-based applications. In event-based applications, user’s payment is reflected by one-time events.