Internet Connections (Grade 12 NSC Matric Computer Application Technology): Revision Notes
Internet Connections
Understanding internet connections
To access the amazing services available on the internet, you first need to establish a connection to it. In South Africa, you'll need to pay an Internet Service Provider (ISP) like MWeb or WebAfrica, or alternatively use a mobile network provider (MNP) such as Vodacom or MTN. These companies charge a monthly fee to provide you with internet access.
The way we connect to the internet has evolved significantly over the years. In the early days, people had to use dial-up modems that were slow, required dialling up each time you wanted to connect, and would disconnect whenever you used your phone. Fortunately, this all changed with the development of broadband technology.
Broadband connections
Broadband represents a major advancement in internet technology. It provides a high-speed data connection that can send information across multiple channels simultaneously. This makes your internet connection much faster and more dependable compared to the old dial-up system.
There are several types of broadband connections available, including ADSL, 3G, and fibre. Each offers different speeds and reliability levels.
It's crucial to understand that not all broadband services are available everywhere. When choosing between a wired or wireless connection, you should research the coverage and availability of different connection types in your specific area. Most service providers offer network coverage maps on their websites to help you determine what's available where you live.
Choosing the right internet connection
When selecting an internet connection, you need to carefully consider four essential factors:
- Speed of the internet - How fast you need your connection to be
- Data cap of your connection - How much data you're allowed to use
- Cost of the internet - What you can afford to pay monthly
- Equipment you will need - What hardware is required for the connection
Understanding these factors will help you make an informed decision that meets both your needs and budget.
Internet speed and bandwidth
When evaluating internet connections, you'll encounter the term "bandwidth." In simple terms, bandwidth refers to how much data can be transferred over a network within a specific timeframe. The higher the bandwidth, the more data can be transferred quickly.
It's important to understand the difference between downloading and uploading data. Downloading involves transferring data from the internet to your computer - this includes activities like watching videos, browsing websites, or downloading files. Uploading, on the other hand, involves transferring data from your computer to the internet, such as posting a video to YouTube or sharing photos on social media.
Understanding Download vs Upload Speeds:
When you see an internet plan advertised as "20/5 Mbps":
- Download speed: 20 Mbps - for receiving data (streaming, browsing, downloading files)
- Upload speed: 5 Mbps - for sending data (posting photos, video calls, uploading files)
Most activities require more download than upload bandwidth, which is why download speeds are typically higher.
Data caps and data bundles
A data cap is a restriction placed by service providers that limits how much data you can transfer within a specific period at a certain speed level. These caps apply to both home internet services and mobile data plans.
Here's how data caps typically work: You're given a maximum amount of data to use each month for an agreed price. If you exceed this limit, you'll be charged at a higher rate for any additional data usage.
Some providers don't charge extra but instead slow down your connection speed once you've reached your limit. For example, if you have a 4G mobile plan, your speed might be reduced to 3G once you've used all your allocated data.
Service providers might impose data caps for various reasons, such as when customers share access with many users, use file-sharing software, or violate terms of service. Sometimes caps are implemented when providers have a monopoly in a particular area.
Data caps can significantly impact your online experience, especially when accessing multimedia content and streaming services. This creates challenges for content creators and advertisers, making data caps generally unpopular with customers.
As a result, providers often use alternative terms like "fair usage policies," "usage-based billing," or simply "band caps" instead of openly calling them data caps.
Data bundles offer a different approach to internet access. Instead of paying for time online, you pay for a specific amount of data measured in bytes. This system works similarly to airtime on mobile phones - you purchase data in advance and use it as needed. Whether you're online for five minutes or five hours doesn't matter; what counts is how much data you consume. This makes bundles a cost-effective and convenient way to manage your internet usage.
Fair-usage policies
A fair-usage policy (FUP), sometimes called a reasonable-usage or acceptable-usage policy, applies to accounts advertised as "uncapped." Despite being called unlimited, these accounts do have restrictions.
According to the fair-usage policy, your internet speed won't be limited or slowed down unless you use excessive amounts of data, at which point your access may become unusably slow. Many supposedly unlimited internet accounts include strict fair-usage policies that can catch users off-guard if they're not careful about their data consumption.
Internet costs
The cost of internet access remains a significant consideration, particularly in South Africa where it's still considered an expensive service for many people.
Generally, faster internet connections with larger data allowances will cost more than slower connections with smaller data caps. You'll need to balance your speed and data requirements with what you can afford.
Equipment needed for internet connection
To connect to the internet, you'll need four basic components:
- Computer - Your device for accessing the internet
- Internet connection channel - The physical or wireless pathway for your connection
- Internet communication device - Equipment like a modem or router to facilitate the connection
- An ISP - The service provider that gives you access to the internet
All four components must work together to establish a successful internet connection. If any one component fails or is incompatible, your connection won't work properly.
Understanding throttling
Bandwidth throttling is the intentional slowing down of available internet speeds. This practice involves deliberately reducing the connection speed between your device and the website or service you're trying to access.
As a user, throttling rarely benefits you. Internet service providers typically throttle bandwidth to manage network congestion during peak times, reducing the amount of data they need to process simultaneously.
This helps them avoid purchasing more expensive, faster equipment to handle high traffic volumes. Another reason providers might throttle bandwidth is to encourage users to upgrade to more expensive plans that don't have bandwidth restrictions. In this way, throttling can serve as an incentive for customers to pay for premium services.
Traffic shaping explained
Traffic shaping is a network management technique used for several purposes:
Traffic Shaping Applications:
- Priority management: Time-sensitive data (like video calls) may receive priority over traffic that can handle brief delays without major issues
- ISP traffic control: Large internet service providers might shape the traffic of smaller, independent providers
- Business prioritisation: In corporate environments, work-related internet traffic might be given priority over personal browsing
- Bandwidth limitation: ISPs may restrict bandwidth for certain applications to reduce costs and accommodate more subscribers - this practice can effectively limit a user's "unlimited" connection without notification
- Premium services: Traffic shaping could become part of a two-tier internet system where certain customers or services receive priority treatment for an additional fee
Key Takeaways
Key Points to Remember:
- Broadband connections are faster and more reliable than old dial-up systems, using multiple channels to transfer data efficiently
- Four key factors determine your internet connection choice: speed, data cap, cost, and required equipment
- Data caps limit how much information you can transfer monthly, while data bundles let you pay for specific amounts of data
- Fair-usage policies can slow down "unlimited" accounts if you use too much data, so read the terms carefully
- Throttling and shaping are techniques ISPs use to manage network traffic, which can affect your connection speed during busy periods