In the prvious section, you learned that networks are susceptible to hackers and unauthorized access. As a result, organizations need to control access to the resources on a network. Most distributed netwroks supports multiple users, each with different access permissions to the resources and computers on the networks the informations and assets in an organization are crucial and keeping them safe constitues network security. The security model of a network should ensure

control on resources by using the following mechanisms :

• Authenctication
  

• Access Control
  

• Data encryption
  

• Auditing
  

• Intrusion detection
  

• Securing servers
  

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Computers were intially used to simplify the task of computing, storing, and processing data. The number of computers and computer users was limited. As a result, the security of systems was not given much importance. The nature of computing has drastically changed over the past few years. With the introduction of network and the internet, there has been

an enormous increase in the number of computers users. Today, most organizations rely on computerized systems for storing data and coordinating businnes activities. In additions, a number of individual users use computers to avail different services, such as online shopping, online banking, and messaging.

Most computers connected to networks are vulnerable to attacks by viruses, worms, or unauthorized users. Individual users also face security threats, such as the theft and mususe of data and virus attacks.

What Is Security

The term security refers to the protection of system resources from intentional or accidental disclosure, destruction, or modification. The resources are infrastructure, hardware, software applications, files/directories, the data stored in the database, and the data in trainst. Securing resources involves implementing resource-usage policies to ensure that the resources are used per the organizational norms, unauthorized users are unable to misuse the resources, and authorized users are not denied access to the resources of the organizations.

To understand the need for security, consider the scenario of an organization that is using the IT setup. This organization is in the business of developing computer games and allows customer to download the games from its web site, which is hosted on the Microsoft Internet Information Server (IIS) Web server. In case a virus infects the files on the web server, the other IT resources of the organization also become vulanerable to the virus attack. The virus can also infect the PCs of all users donwloading games from this Web site. To prevent this type of virus attack, it is important to implement security on the Web server. In addition, PC users must implemetn security on the web server. In addition, PC users must does not infect their computer systems.

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A Web server is a process running on the operating system, which enables users to access Web pages by using a browser. When a user requests a browser for files, text, and images, the browser sends the request over the Internet to remote computers. The web server software that runs on the remote computers sends the requested data back to the browser.

Example of web server software applications are: National Center for Supercomputing Applications (NCSA), Apache, IIS, Netscape Enterprise Server, Novell Web Server, and others.

Intorducing Internet Information Server

Internet Information Server (IIS) is a web Server from Microsoft Inc., which provides a highly realible, manageable, and scalable Web application infrastructure. This Web Server is a group of Web services. IIS help host web sites and make applications available without increasing system administration costs.

IIS provides many Web services, which are :

• WWW service : The WWW service enable users to establish multiple Web sites on a single Web server. The integration of the WWW service with IIS provides a high level of security, better performance, and standards-based publishing protocols.
  

• File Transfer Protocol (FTP) Service : The FTP service enables users to set up FTP sites for uploading and donwloading files.
  

• Simple Mail Transfer Protocol (SMTP) Service : The SMTP service enables users to send and receive e-mail messages over the Internet.
  

• Network News Transfer Protocol (NNTP) Service : The NNTP service enables users to host electronic discussion groups or newsgroups.
  

• Front Page Server Extensions : Front Page Server Extensions enable user to create and edit HTML pages for a Web site directly on a server computer.
  

• Common Gateway Interface (CGI) and Internet Server Application Programming Interface (ISAPI) : CGI and ISAP are programming interfaces that enables client/server applications over the Internet.
  

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Internetworking services are the services in a networking environment that are accessible to users within an intranet or the Internet. These services allow you to share or use the resources located across networks. The servers that provide these services are known as

Internetworking Servers. Examples of Internetworking Servers are Mail servers, News Servers, and so on.

The following are some of the services provided by the Internetworking servers:

• File Transfer - This service enables file transfer accross machines, using the HTTP protocol .
  

• WWW - This services enables users to access the HTML pages at a published site.
  

• E-mail - This services enables users to communicate with other users. The SMTP service needs to run for managing the receipt/delivery of mail messages.
  

• Telnet - This services enables users to logon remotely to a server. THe Telnet service has to run for allowing the clients to log on to a remote server.
  

• Usenet newsgroups - This service provides users a set of bulleting boards about different subjects. The NNTP service is neede for this purpose.
  

Other Internetworking Servers

Apart from web servers, mail servers, mailing list servers, and FTP servers, many other servers are used on an internetwork. Some of the internetworking servers are :

• Domain Name Servers (DNS)
• News Servers
• Proxy and caching servers
  
• Media servers
  
• Certificate servers
  
• Catalog servers
  
• FAX servers
  
• Transaction servers
• Mirrored servers

Domain Name Servers
DNS is a service used on the Internet to translate Fully Qualified Domain Names (FQDN) to their actual IP addresses.

News Servers
A news server stores, organize, and distributes the messages posted in newsgroup.

Media Servers
A media server is a server that maintains streaming audio/video content.

Certificate Servers
Certificate are digitaly signed documents that enable you to use smart card logon, send encrypted e-mail, and sign electronic documents.

FAX Servers
A fax server allows multiple users to send faxes over the network. A fax server usually consists of three components, a computer running a Windows OS connected to any network, fax server application software, and a fax modem or an intelligent fax board.

Transaction Servers
A transaction server manages applications and databse transaction request on behalf of client computers.

Mirrored Servers
Similar to redudant disk drives, mirrored servers provide the fault-tolerance and redudancy that mission-critical information systems need.

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Belajar Pemograman Java

• . Java-fundamental-1.pdf

• . java-desktop.pdf

• . Buku-oop2.pdf

• . Latihan Soal Jawaban Java.pdf

• . JavaApplet.pdf
  

• . 11Inheritance.pdf

• . Perancangan dan Pembuatan sistem Konversiberbasis xml dan Java.pdf
  

• . Alur belajar Java.pdf

• . Belajar java secara Visual dan Interaktif.pdf
  

• . Soal Latihan Java.pdf

• . JENI-Intro1-Bab03-Mengenali Lingkup Pemrograman Anda.pdf
  

• . JENI-Web Programming-Bab 5-SQL dan JDBC.pdf
  

• . Konsep OOP.pdf

• . netbeans.pdf

• . swing-excerpt.pdf

• . Mudah Belajar Java.pdf

• . UjianAkhirJawaban.pdf

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Hari minggu tepatnya jam 08.00 wib, aku dan temanku pergi ke masjid kuba Mas dengan mengendarai sepeda motor dengan jumlah 4 sepeda motor, yang tepatnya berada di kota Depok. Tapi sebelum itu tepatnya dirumah abdul kami semua berkumpul disana untuk keberangkatan, setelah semuanya sudah lengkap, tepatnya pukul 12.00 wib, akhirnya kami berangkat juga karena teman2 sudah berkumpul semua, dalam perjalanan cuacanya benar2 ekxtra HOT.....keringat kami berceceran kemana2, sampai kami tersasar karena tidak tau tempat kuba mas berada. Tapi dengan semangat kami untuk pergi ke kuba Mas tetap tinggi tepat senang.

Setelah mutar2 mencari tempat kuba mas berada, akhirnya sekian lama mencari tempat dimana kuba mas berada, akhirnya ketemu juga. Setelah kami semua sampai disana Kuba Mas benar2 Subahanallah, masjid ujung terbuat dari emas yang berkilau cahayanya dan di halaman disana benar2 sangat luas dan menyegarkan , lalu setelah berjalan menuju masjid kami langsung melakukan solat zuhur disana, setelah solat kami semua berfoto - foto dengan wajah senang dan tersenyum

Gambar : Masjid Kuba Mas

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Hellow Nama Lengkap aku Agung Brahma Arvin , tapi panggil aja Agung. Aku kuliah di CCIT-FTUI dan di Universitas Pancasila. sekarang aku smester 3. Aku tinggal di daerah cibinong-bogor yang tepatnya di jalan Golf komplek

bakosurtanal No 35. Rt/Rw 03/05. Keluarga ku ada 7 termasuk dengan Ayah dan Ibu ku, aku anak keempat dari 5 bersaudara. yaudah cukup sampe sini saja profil lengkap ku, capek brow panjang - panjang nulisnya ... hehehehe

Untuk lebih jelasnya Lihat Selengkapnya

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