computer science

Network Load Balancing Services

Network Load Balancing Services 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 Network Load Balancing Services rather than just read about it. In short: Network Load Balancing (NLB), historically known as Network Load Balancing Services (NLBS), is a Microsoft Windows Server feature that implements clustering and load balancing to provide high availability and high reliability, as well as high scalability. NLBS is intended for applications with relatively small data sets that rarely change (one example would be web pages), and do not have long-running in-memory state…

Key takeaways

Network Load Balancing Services 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 Network Load Balancing Services to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Network Load Balancing Services from memory before moving on to harder problems.

Reference excerpt

Network Load Balancing (NLB), historically known as Network Load Balancing Services (NLBS), is a Microsoft Windows Server feature that implements clustering and load balancing to provide high availability and high reliability, as well as high scalability. NLBS is intended for applications with relatively small data sets that rarely change (one example would be web pages), and do not have long-running in-memory states. These types of applications are called stateless applications, and typically include Web, File Transfer Protocol (FTP), and virtual private networking (VPN) servers. Every client request to a stateless application is a separate transaction, so it is possible to distribute the requests among multiple servers to balance the load. One attractive feature of NLBS is that all servers in a cluster monitor each other with a heartbeat signal, so there is no single point of failure. Because it operates at the network level rather than the application level, NLB does not support the automatic removal of a failed server from a cluster based on application health, unless the server is completely offline or its NLB service is stopped. This architectural limitation has remained consistent from Windows Server 2003 through modern releases. For example, if a web server is returning an error page instead of correct content, it is still perceived as "alive" by NLB. As such, a monitoring script or third-party application load balancer is typically required on every participating node to check the correctness of local web page delivery, and call the nlb.exe command-line utility to add or remove itself from the cluster as needed.

History Windows NT Load Balancing Service (WLBS) is a feature of Windows NT that provides load balancing and clustering for applications. WLBS dynamically distributes IP traffic across multiple cluster nodes, and provides automatic failover in the event of node failure. WLBS was replaced by Network Load Balancing Services in Windows 2000. Auto fail over is also a part in this frame.

References

Worked examples

Example 1 — a first encounter with Network Load Balancing Services

Start with the simplest possible case. Write down what Network Load Balancing Services 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 Network Load Balancing Services 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 Network Load Balancing Services 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 Network Load Balancing Services

In research: Network Load Balancing Services 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 Network Load Balancing Services 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: Network Load Balancing Services is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer network stubs, Internet Protocol based network software, Load balancing (computing), so understanding it makes those chapters shorter.
In everyday life: Look for Network Load Balancing Services 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Network Load Balancing Services in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Network Load Balancing Services 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 Network Load Balancing Services out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Network Load Balancing Services in simple terms?

Why does Network Load Balancing Services 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 Network Load Balancing Services?

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 Network Load Balancing Services.