computer science

ISP redirect page

ISP redirect page is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand ISP redirect page rather than just read about it. In short: An ISP redirect page is a spoof page served by major ISPs including: Cox Communications, Embarq, Verizon, Rogers, Earthlink, and various others when World Wide Web users enter an invalid DNS name. If a user types in an incorrect Uniform Resource Locator (URL), for example http://wikipedia.orf instead of http://wikipedia.org, the ISP's DNS server will respond with a spoofed DNS response that redirects the user to an…

Key takeaways

ISP redirect page belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect ISP redirect page to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of ISP redirect page from memory before moving on to harder problems.

Reference excerpt

An ISP redirect page is a spoof page served by major ISPs including: Cox Communications, Embarq, Verizon, Rogers, Earthlink, and various others when World Wide Web users enter an invalid DNS name. If a user types in an incorrect Uniform Resource Locator (URL), for example http://wikipedia.orf instead of http://wikipedia.org, the ISP's DNS server will respond with a spoofed DNS response that redirects the user to an advertising web page.

How it works Domain Name System (DNS) resolution is the process of translating a human-readable domain name (for example, en.wikipedia.org) into an IP address that computers can use. Every ISP runs a DNS server to allow their customers to translate domain names into IP addresses that computers understand and use. When an ISP's DNS server receives a request to translate a name, according to RFC the DNS server should return the associated IP address to the customer's computer which is then able to connect to the requested resource. When the ISP's DNS server receives a request for a name that is not recognized or is unavailable, some ISPs spoof the NX (null) response and instead return the IP address of a search or advertising page to the client. When the client is using a web browser, this will display a search page that contains possible suggestions on the proper address and a small explanation of the error. These search pages often contain advertising that is paid to the ISP. Sometimes, a customer can opt-out of this service, but the opt-out is frequently not implemented at the same layer as the spoofing. Opt-out procedures vary from ISP to ISP in both their method of implementation and effectiveness.

Consequences ISPs have written that redirect pages are intended to help lost users. ISP customers have complained that the pages are instead misleading to users, and that their purpose is to generate advertising revenue for the ISP. The practice has been controversial since ISP redirect pages were introduced in 2006. ISP redirects can fool the ping networking utility. Ping may falsely report that a website is responsive when in truth it is unavailable but redirected. ISP redirects also interfere with web archiving tools like ArchiveTeam Warrior

References

Worked examples

Example 1 — a first encounter with ISP redirect page

Start with the simplest possible case. Write down what ISP redirect page claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to ISP redirect page before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about ISP redirect page ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of ISP redirect page

In research: ISP redirect page appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses ISP redirect page in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: ISP redirect page is common in secondary-school and first-year university syllabi. It links to neighbouring topics Domain Name System, Hacking (computer security), Internet ethics, so understanding it makes those chapters shorter.
In everyday life: Look for ISP redirect page outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study ISP redirect page in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what ISP redirect page means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain ISP redirect page out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ISP redirect page in simple terms?

Why does ISP redirect page matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study ISP redirect page?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on ISP redirect page.