Istilah bandwidth selalu dipakai dalam penawaran paket hosting dari perusahaan hosting. Bandwidth adalah besaran lalu lintas data yang diperbolehkan melalui website kita ke seluruh internet. Besaran bandwidth yang disediakan oleh perusahaan hosting ditentukan oleh koneksi jaringan mereka, baik yang melalui internal data center mereka mahupun ke eksteandwidth transfer data yang diperbolehkan dalam suatu paket hosting. Misalnya jika kita memiliki halaman web sebesar 48kb, maka setiap pengunjung halaman web kita yang membuka halaman tersebut akan download informasi dan data yang sebesar 48kb ke dalam komputer mereka. Jika ada halaman 100 pengunjung ke halaman tersebut maka telah terjadi transfer data sebesar 4800kb daripada server yang mana file kita berada di dalam komputer. Jadi bandwidth ialah istilah yang digunakan untuk menunjukkan besaran data yang telah ditransfer keluar daripada kuota space hosting kita.
Dengan perkataan lain pula, bandwidth dikatakan sebagai jalan raya yang memberi laluan kepada kenderaan berlainan saiz. Jalan raya tersebut akan sesak pada masa tertentu apabila semua orang menggunakannya pada waktu yang sama. Sebaliknya, jalan raya tersebut akan berjalan lancar pada masa orang kurang menggunakannya.
Besaran bandwidth yang kita buntuhkan bergantung daripada 2 faktor :
1.) besar file dalam website kita - semakin besar file yang akan diakses oleh pengunjung website kita, maka semakin besar kebutuhan bandwidth kita.
2.) populatitas website kita - semakin popular website kita , maka akan semakin ramai pengunjung yang akan melihat website kita dan semakin besar pula kebutuhan bandwidth kita.
Ada rumusan sederhana yang biasa digunakan untuk memperkirakan berapa kebutuhan bandwidth bagi website kita (sumber: www.findmyhosting.com), iaitu :
Rata-rata pengunjung setiap hari x Rata-rata halaman web dilihat x Rata-rata ukuran file halamn web x 31 x Fudge Factor
*Rata-rata pengunjung setiap hari : jumlah pengunjung yang kita perkirakan mengunjungi website kita, secara rata-rata setiap harinya
*Rata-rata halaman web dilihat : Secara rata-rata, jumlah halaman web yang kita perkirakan akan dilihat pengunjung. Jika kita memiliki 50 halaman web maka rata-rata setiap pengunjung akan melihat 5 halaman web anda dalam satu kali kunjungan.
* Rata-rata ukuran file halaman web : Rata-rata ukuran halaman web kita dalam kilobyte (kb), jika kita sudah melakukan design web kita, kita dapat menghitung berapa ukuran per halamannya.
*Fudge Factor : Nilai di atas angka 1. Gunakan 1.5 untuk hasil yang amaun yang mengasumsikan bahawa estimasi sebesar 50% . Jika anda tidak yakin cukup, anda biasa gunakan angka 2/3 untuk memastikan kebutuhan bandwidth anda lebih dari cukup.
Semakin besar kapasiti bandwidth, semakin bagus. Fakta ini boleh dikaitakan dengan jalan raya. Traffik akan berjalan dengan lebih lancar di atas jalan raya yang lebih lebar berbanding dengan jalan kampung. Justeru itu, ini bersamaan dengan fakta yang dinyatakan tadi iaitu semakin besar kapasity bandwidth tersebut, semakin senang bagi kita untuk akses ke website kita.
Some website put a cap on the usage, depending on the package we got.Example : our webhostandwidthing provider will give us 10GB of bandwidth per month which means users can freely get to our website until the count reach 10GB. At this point, the access will be block automatically & our users will receive a message like this "website has exceeded its monthly bandwidth utilization. The count will reset after certain time. So if our website will be a high traffic website or business website, we may want to get a package with a big bandwidth cap or unlimited. We can explain this with two examples :
Eg 1) We got 1GB per month. Let's say we have about 500mb of data on our website. We give access to 10 users. Each user will download about 50MB daily on average. So 50MB times 10 users equal to 500MB. So on the first day, we have used 500MB worth of bandwidth. If our users keep up the same pace, we'd meet our bandwidth limit on the second day of the month. If we started the service on the forst of the month, our isp will reset our bandwidth count back to 0 on the first of next month.
Eg 2) Contohnya kita ada satu tabung, tabung itu boleh muat 25 biji duit 50sen. Keluarga kita akan masukkan duit 50sen pada bila-bila masa. Apabila tabung tersebut penuh, kita akan simpan dalam bank. Akan tetapi, bank hanya akan menerima pada hari pertama dalam setiap bulan. Justeru itu, kita harus menunggu sehingga hari pertama pada bulan depan untuk mengosongkan tabung kita dan bermula untuk menabung lagi.
8 ways to save bandwidth surfing
1)Set auto disconnect
Example: Broadband
2)Turn off superfluos media
Use search engine like Google more than Yahoo. It's because less image on Google. Multimedia is the biggest source of bandwidth.
3)Avoid unneccessary or large download
No bit torrents, downloading of media, online gaming, discourage file sharing on IM
4)Avoid streams
Discourage media streaming or online TV, Skype, Youtube, and other audio or web cam transmissions. If users have to upload some video/audio it might be a good idea to set up a schedule.
5)Clean homepage
Cleanest the smaller page ever.
6)Turn off system internet use where possible
Turn off ones that search the internet for updates, turn off Windows auto update, close any widgets or sidebar items that are also getting web information. This also includes closing program like email clients that automatically access the internet periodicallu.
7)Make sure you're coaching
Make sure your system isn't downloading content every time you visit pages.
8)Get sofeware to monitors your bandwidth usage
If you're using broadband, there will always have the quota there. You can see from there
Kaedah-kaedah Keselamatan Penggunaan Bandwidth dalam ICT
1.) Bandwidth Monitoring without Probes
NetFlow Analyzer does network bandwidth monitoring using NetFlow. NetFlow exports are collected, correlated, and analyzed by the bandwidth monitor to get granular details to monitor bandwidth usage across each WAN link. There is no need for hardware probes to monitor bandwidth usage. NetFlow Analyzer bandwidth monitor is an all software solution which is suitable for both Windows and Linux. Network Ben bandwidth monitoring with Netflow Analyzer help us reduce the time taken to isolate & contain threats like worms & virus attacks. It has also helped us to solve network incidents faster & do better capasity planning. Network bandwidth monitoring is one of the most critical activities of an enterprise network administrator. Netflow Analyzer is a bandwidth monitor that provides several instant reports to monitor bandwidth including top talkers, top protect, top conversations & more. The reporrts can be exported as pdf, csv or can even be mailed to you apart from these predefined bandwidth reports. Netflow Analyzer bandwidth monitor also includes options to search for specific bandwidth usage details based on IP address, host name, protocol & more.
2.) Real-time Bandwidth Monitoring
We can provide the utilization report of the network for daily/monthly/even yearly basis. The report is in term of the perdentage of the bandwidth that the user acquire during for transferring data&it is in a form of graph. There are usually many tools can be used to measure the utilization of the network. Most popular one is cacti/MRTG. Bandwidth monitoring reports for each interface shows the current, average, and peak bandwidth usage patterns across each NetFlow-enabled interface. With these bandwidth usage statistics you can get instant visibility into how much bandwidth was used up by hosts, applications, and conversations across a specific interfaces. The NetFlow Analyzer is a great bandwidth monitor to get real time data about bandwidth being used. Through the graph, we can determine how rapid & when the user use the network or when they are idle. This graph is essential to determine whether the bandwidth that is supplied to the user is enough or not to cater user requirement to transfer data atau any accesssibility to internet through the network.
3.) Historical Bandwidth Usage Trends
The NetFlow Analyzer bandwidth monitor allows you to view the bandwidth usage over a period of time.Bandwidth monitoring trends shows the usage patterns and traffic trends across a day, week, month, and a year. With such statistics, you can analyze how bandwidth is used in your network, and decide if you need to increase available bandwidth.
4.) Application-wise Bandwidth Distribution
To monitor bandwidth utilized by different applications, NetFlow Analyzer bandwidth monitor gives you instant visibility into which applications are using up maximum bandwidth. You can also drill down to see the top sources, destinations and conversations using the bandwidth. With such granular detail, network troubleshooting and problem resolution take far less time than with traditional tools.
5.) Consolidated Bandwidth Usage Summary
Bandwidth Monitor's reports summarizes the bandwidth utilized and show the overall bandwidth usage statistics for a WAN link. You can monitor bandwidth usage patterns in real time, along with details on hosts, applications, and conversations using up bandwidth for the selected time period. Options to see bandwidth usage during peak working hours is also available. NetFlow Analyzer is a NetFlow, sFlow, JFLow (and more) collector and analyzing engine integrated together. NetFlow analyzer is a software (for windows and linux), does not require any hardware probes, which can be downloaded, used in your network environment and can be evaluated for 30 days. Go through the following useful links for better understanding of how NetFlow Analyzer can help you in understanding your network traffic and bandwidth utilization.
Availability and Bandwidth Monitoring—the Easy Way
More than 150,000 administrators rely on PRTG Network Monitor every day to monitor their LANs, WANs, servers, websites, appliances, URLs, and more
Businesses rely on their networks for data, communication, and backbone operations. Slow performance and outages can impact the bottom line of your business. Continuous monitoring enables you to find problems and resolve them before they escalate:
· Avoid performance bottlenecks and proactively deliver better quality of service
· Reduce costs by buying according to needs and increase profits by minimizing downtime
· Find peace of mind: No alarms from PRTG means that everything is running fine
Bandwidth and Network Usage Monitoring
PRTG Network Monitor runs 24/7 on a Windows-based machine within your network, recording network usage parameters. Recorded data is stored in a database for historic reports.
The easy to use web-based user interface allows to configure the devices and sensors that you want to monitor. You can create usage reports and provide colleagues and customers access to dashboards with live graphs and tables.
All common methods for network usage data acquisition are supported:
Performance and Availability Monitoring
PRTG Network Monitor includes more than 115 sensor types for all common network services (e.g. Ping, HTTP, SMTP, POP3, FTP, etc.), allowing to monitor your network systems for speed and failures. As soon as outages occur the software will alert you by sending emails, SMS, pager messages, and other notifications. Request times and downtimes are constantly recorded in the database and you can compile performance, downtime, and SLA reports at any given time.
