When choosing an internet connection, attention usually focuses on two figures: the price and the advertised speed. However, the true quality of the service becomes apparent only when you actually need it: during an important video call, while backing up company data, or in the event of an outage. Before signing the contract, it pays to ask the provider a few specific questions.
Is the speed guaranteed or just shared?
Most providers sell speed that is shared among multiple customers simultaneously on the same route. This is called aggregation. In practice, this means that during peak times, when the most people are using the connection at once, the actual speed drops below the advertised value. Ask directly about the aggregation ratio. Capacity sharing is common for home connections and usually causes no issues, but for business operations with sensitive applications, guaranteed capacity that is not shared with anyone else is more appropriate.
Is the connection symmetrical?
Download speed and upload speed are not the same. For many cable connections and older tariffs, uploading is significantly slower than downloading, which mainly affects video calls, cloud backups or remote access to company systems. Fibre optic connections, on the other hand, are typically symmetrical, offering the same speed in both directions. We covered this topic in detail in our article about symmetrical internet for working from home.
How much speed do you actually need?
A higher number in the tariff does not automatically mean a better choice. For a household with standard web browsing, streaming and one person working from home, a tariff in the hundreds of Mb/s is more than sufficient. Higher speeds are worth it where multiple devices and people are connected at once, several workstations, smart home systems, frequent transfers of large files or online gaming with low latency. Before you get advice on a specific number, it is good to calculate how many devices will be connected simultaneously and what they will be used for.
What exactly does the SLA guarantee?
The abbreviation SLA denotes a contractual commitment to a specific service level: typically connection availability in percentages and the time within which the provider will rectify a fault. Ask for specific figures: how many hours a technician's intervention takes, what guaranteed availability is offered, and whether compensation exists for prolonged outages. For households, basic support is usually sufficient; for business operations, SLA is one of the key criteria, more in the article about internet for businesses and guaranteed lines.
What does the small print in the contract say?
Before signing the contract, verify its duration (fixed or indefinite), the notice period and any penalties for early termination, as well as the price after the initial promotional offer ends. It is also worth finding out if you will have to pay extra for installation or a loaned device and what happens to it once the contract expires. A good provider will state these conditions without hesitation and without requiring you to search through dozens of pages of terms and conditions, if answering a simple question demands a complicated explanation, that in itself is a warning sign.
What types of connection are available?
Providers today typically offer a combination of optical connection, cable TV with internet, fading DSL, and wireless or mobile connectivity. Each type has different characteristics in terms of speed, stability, and data transmission quality. A detailed comparison can be found in the article. Optical cable, wired connection, or Wi-Fi?
How to ask about support and servicing
The quality of the connection is also evident from who handles faults. Ask whether installation and repairs are carried out by the provider's own technicians or by external subcontractors, through whom every request takes an extra step. Check the available contact channels, telephone, email, or a technical line outside working hours, and whether the provider has its own infrastructure directly in the locality where you live or operate. A provider that owns and manages its own network usually resolves faults faster than one that merely resells someone else's capacity.
Summary
The best provider is not necessarily the one with the lowest price on a billboard, but the one who answers questions about aggregation, symmetry, SLA and contract terms clearly and without evasion. If you are dealing with connection availability in Prague, we will also be happy to advise on selecting a specific tariff.