In AP Computer Science Principles, a computer network is a group of interconnected computing devices capable of sending or receiving data (EK CSN-1.A.3). It's a type of computing system, and the Internet is the biggest example, a network made of interconnected networks.
A computer network is a group of interconnected computing devices that can send or receive data. That's the exact CED definition (EK CSN-1.A.3), and the AP exam expects you to use those words precisely. A computing device is any physical artifact that can run a program, so we're talking computers, tablets, servers, routers, and even smart sensors. Connect them so they can pass data back and forth, and you have a network.
Here's the part that trips people up. A computer network is a type of computing system (EK CSN-1.A.4). A computing system is any group of computing devices and programs working together for a common purpose. A network is the version of that where the devices are physically or wirelessly interconnected and exchanging data. When two devices on a network communicate, the data travels along a path, a sequence of directly connected devices linking the sender to the receiver. The Internet scales this idea up massively: it's a computer network made of interconnected networks, all speaking the same open, standardized protocols.
This term anchors Topic 4.1 (The Internet) in Unit 4: Computer Systems and Networks. It directly supports learning objective 4.1.A (explain how computing devices work together in a network) and sets up 4.1.B, 4.1.C, and 4.1.D, because you can't explain how the Internet works, how packets travel, or how the Web differs from the Internet without first nailing what a network is. The whole vocabulary chain of Unit 4 stacks on this one definition: device → computing system → network → Internet → World Wide Web. If you can recite that hierarchy and explain each link, you've got the backbone of Unit 4's multiple-choice questions.
Keep studying AP Computer Science Principles Unit 4
Routers (Unit 4)
Routers are the computing devices that connect networks to each other. They decide which path your data takes, which is what makes a 'network of networks' like the Internet actually function.
Routing (Unit 4)
A network gives you possible paths between sender and receiver; routing is choosing which path the data actually takes. On the Internet, routing is dynamic, meaning the path isn't fixed ahead of time and can change between messages.
Bandwidth (Unit 4)
Bandwidth measures how much data a network connection can move per second. Defining a network as devices 'sending or receiving data' naturally raises the question of how fast, and that's bandwidth.
Switches (Unit 4)
Switches connect devices within a single network and forward data to the right device. Think of switches as managing traffic inside one network while routers manage traffic between networks.
Computer network shows up almost entirely in multiple-choice questions, and they test definitions with surgical precision. Expect stems like 'which scenario best illustrates interconnected computing devices sending and receiving data' or 'which statement describes a limitation that would prevent devices from forming a functional computer network.' A favorite move is testing the hierarchy: questions ask you to explain why a campus network counts as a computing system, which checks whether you know a network is a type of computing system, not a separate thing. You don't need to configure anything technical. You need to classify scenarios correctly, identify what makes devices a network (interconnection plus data exchange), and keep the device → system → network → Internet ladder straight.
Every Internet is a computer network, but not every computer network is the Internet. A computer network is any group of interconnected devices that can send or receive data, including your home Wi-Fi or a school's local network. The Internet is one specific, global network made of interconnected networks that all use standardized, open (nonproprietary) protocols like IP, TCP, and UDP. On the exam, if a question is about open protocols, packets, or dynamic routing, it's asking about the Internet specifically, not networks in general.
A computer network is a group of interconnected computing devices capable of sending or receiving data, and the exam rewards using that exact definition.
A computer network is a type of computing system, which is any group of computing devices and programs working together for a common purpose.
A path between a sender and a receiver on a network is a sequence of directly connected computing devices.
The Internet is a computer network made of interconnected networks that use open, standardized protocols, so it's a special case of a network, not a synonym for one.
Computing devices include more than computers; tablets, servers, routers, and smart sensors all count because they can run a program.
Keep the hierarchy straight: computing device → computing system → computer network → Internet → World Wide Web.
It's a group of interconnected computing devices capable of sending or receiving data (EK CSN-1.A.3). The devices can be computers, tablets, servers, routers, or smart sensors, anything that can run a program.
No. The Internet is one specific computer network made of interconnected networks that use open, standardized protocols. Your home Wi-Fi is a computer network, but it's not the Internet by itself.
Yes. The CED states directly that a computer network is a type of computing system (EK CSN-1.A.4), because it's a group of computing devices and programs working together for a common purpose. Exam questions love testing this exact relationship.
A network is the physical and wireless infrastructure of connected devices. The World Wide Web is a system of linked pages, programs, and files that runs on top of the Internet using HTTP. The Web uses the Internet; it isn't the network itself.
Any physical artifact that can run a program. The CED lists computers, tablets, servers, routers, and smart sensors as examples, so don't assume a network is only made of laptops and desktops.