It is likely that you have used one of the many network "Speed Tests".

Are they trustworthy? Do they really give us a measure of our network provider's service?

Here's a pointer to a piece that says "not really".

Why You Shouldn't Believe Network Speed Tests

The TL;dr is that the performance of the network link between your home (or office) and the provider can not be reduced to a simple bandwidth number.

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The Internet's Domain Name System (DNS) is one of the strong forces that holds the Internet together.

There are many forces that wish to control or restrict the Internet. (See Internet: Quo Vadis (Where are you going?)) DNS has been found to be one of the more convenient places through which that control may be exercised.

The DNS Security system (DNSSEC) is useful in that it allows a client to know that the DNS data it receives is authentic. But DNSSEC can be somewhat difficult to deploy and many applications do not handle non-authentic DNS data well.

Absent DNSSEC DNS queries run the risk of man-in-the-middle attacks in which a masquerading DNS server misleads the client by providing misleading answers or by data-mining the client's queries.

Two recent proposals have been made to help reduce the risks of these man-in-the-middle DNS attacks.

These are DNS-over-HTTP (DoH) and DNS-over-TLS (DoT).

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Recently we have seen a small flood of articles and promotional materials that make claims about network latency.

We find many of those claims to be hyperbolic and sometimes quite misleading.

Let us begin, as we almost always will begin, by informally defining the terms "latency" and "jitter".

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The press (tech and otherwise) is filled with grandiose claims of "zero latency".

There is no such thing as zero latency in computer networks.

Some new technologies - 5G and Wi-Fi 6 - may (and probaby do) reduce latency. That reduction is only for that limited portion of the full end-to-end communications path that is carried on 5G or Wi-Fi 6.

In real life, a path between devices on a network is usually composed of many elements (which may change over time.) The name "Internet" itself means a a network of networks. Usually 5G or Wi-Fi 6 will make up only a very small piece of the overall path.

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