Architecture : Online Architecture

Layer 6: Presentation - Layer 6 takes the data provided by the Application layer and converts it into a standard format that the other layers can understand.

2. How would you instruct an Apache server to listen on Port 81 instead of Port 80?

Firewall: A firewall is a software or hardware-based network security system that controls the incoming and outgoing network traffic by analysing the data packets and

Web applications use a three-tiered architecture: The first tier is the Client Browser application, the second tier is a Web Server, and the third tier is a ________ .

The firewall comes in hardware or software form and acts as a filter for all data

The same implementation should be made for the server as well. In the server's case the firewall placed between it and any client should limit the quantity of connection from a source IP. The unfortunate side of this, and why the client firewall be implemented, is that many clients can be located behind one source IP address. This means that the server's firewall configuration needs to be more lenient the the client firewall.

concerned with the protection of the server where the protection of the server constitute a large proportion of protecting your site

Each IP that accesses the internet will be under a NAT protocol to help protect the users accessing the internet.

The protocol can authenticate both the client and the server (mutual authentication) oronly one party.In the server-authenticated mode, the client can still authenticate it-self by anothermethod such a login/password authentication. All data exchanged are encrypted.HTTPS is commonly used to secure transactions on the Internet. Therefore, it is widelysupported by web browsers and network software libraries. Being a different protocol thanHTTP, it typically uses a different port (443).

I have chosen the three-tier design, the user interface runs on the client and the data is stored on the server. A three-tier design also has a middle layer between the client and server that processes the client requests and translates them into data access commands (Shelly-Rosenblatt, 2012).

A firewall is a system or group of systems that enforces an access control policy between two or more networks. The means by which this control is accomplished varies widely, but in principle, the firewall is a pair of mechanisms, one that blocks traffic and one that permits traffic. Some firewalls emphasize blocking traffic, while others emphasize permitting traffic. The most important thing to recognize about a firewall is that it implements an access control policy. If you don't know what kind of access you want to permit or deny, or you let someone else or some product configure a firewall based on judgment other than yours, that entity is making policy for your whole organization.

There are several ways to build up an intranet. However some common characteristics of an intranet’s architecture, in order for organizations to gain the more out of it, are:

As seen in the figure, functional structure comprising top level management is embedded in levels 1-3. The geographical divisions are embedded in level 4. Product divisions are embedded in levels 5-7 and the frontline teams, the teams at level 8.

“Imagine a person on a desktop computer who uses Microsoft Access to load up a list of personal addresses and phone numbers that he or she has saved in MS Windows “My Documents” folder. This is an example of a one-tier database architecture” (Windowsecutity.com) “A two tier client/server architecture is one in which a user interacts through a Graphical User Interface to communicate with the database server across a network via Structured Query Langauage.” (Windowsecurity.com) Last is an N-Tier Clinet/Server Architecutre. “Most n-tier database architectures exist in a three-tier configuration. In this architecture the client server model expands to include a middle tier (business tier) which is an application server that houses the business logic. This middle tier relieves the client application and the database server of some of their processing duties by translating client calls into database queries and translating data from the database into client data in return.” (windowsecurity.com)

In an e-commerce world, organizations are susceptible to hackers and intruders. Thus creating the information technology protection systems which is used to reduce the possibility of intrusions from occurring. Intrusions occur by uninvited outsiders (sometimes intruders can be internal users like employees) who try to access an organization’s information system using the internet with the intent to gain competitive advantage of some sort. Organizations depend on security technology to avoid loss from security breach, as well as to improve their efficiency and effectiveness. However, firewalls are also vulnerable to errors, and implementing a security technology comes with challenges and critical decisions that can possibly cause a financial burden on the organization if done without seriousness and commitment. “Information security is about managing risk, and managing risk is about discovering and measuring threats to information assets; and taking actions to respond to those threats” (Al-Awadi, & Renaud, 2007, p.3). This paper will discuss a few aspects that are involved with firewalls and intrusion detection systems.