Network purpose, types and digital infrastructures
Classify network types and explain how modern infrastructures support connected services while introducing important trade-offs.
Start with the scale and purpose of the network
- describe LAN, WAN, PAN and VPN by purpose and characteristics;
- describe the internet, cloud computing, distributed systems, edge computing and mobile networks;
- describe benefits and limitations of those infrastructures in realistic settings;
- connect network choices to examples such as the WWW, blockchains, smart traffic lights and schools.
Rapid Recall Deck
Attempt each card first. If a term is new, flip and study it, then answer it again without looking. Mark only secure recall as “Know it”.
Network type follows geographic scope and use
Classify the network
Choose LAN, WAN, PAN or VPN for each scenario: (A) a smartwatch connected to a phone; (B) devices on one school campus; (C) a company securely connecting a remote employee through the public internet; (D) a company connecting offices in several countries.
A → PAN. B → LAN. C → VPN. D → WAN.
Describe the purpose
Why is a school LAN useful even if the school already has internet access?
The LAN connects local devices/resources such as printers, servers and classrooms so they can communicate and share services efficiently inside the school. Internet access then connects that local network to external networks/services; the two purposes are related but not identical.
Modern infrastructure moves computation and data across locations
Cloud computing
Remote provider resources can scale on demand and reduce the need to own all local infrastructure, but service depends on network/provider availability and may raise cost, privacy or control concerns.
Distributed systems
Multiple networked machines cooperate, which can improve scalability/resilience, but coordination, consistency and failure handling become more complex.
Edge computing
Processing near the data source can reduce latency and network traffic, but edge devices may have limited resources and require distributed management/security.
Describe the infrastructure by what work happens where
Smart traffic lights
Describe one reason edge computing could be useful in a traffic-control system that receives local sensor data continuously.
Local processing can react to sensor data with lower latency and continue making time-sensitive decisions without sending every reading to a distant central server first. This can also reduce network traffic, although local devices still need secure management and sufficient processing capability.
Blockchain infrastructure
Why is a cryptocurrency blockchain an example of a distributed system rather than one central computer?
Copies/processing are distributed across multiple networked participants that cooperate according to the system rules rather than relying on one central machine to hold and process the entire service.
Benefits and limitations belong in the same answer
Benefits and limitations
A design company moves its image-processing workflow from powerful local workstations to a cloud service that staff access over the internet.
Cloud infrastructure can make large compute/storage resources available on demand, scale with workload and allow staff to access the service from different locations. Limitations include dependence on reliable network access/provider uptime, possible latency, ongoing cost and security/privacy concerns when data leaves local systems. It is appropriate when flexible remote resources are more valuable than complete local control.
Infrastructure and service are not interchangeable terms
WWW vs internet
A student says “the internet and the World Wide Web are exactly the same thing.” Correct the statement.
The internet is the underlying global network infrastructure connecting networks/devices. The World Wide Web is one service that uses the internet to deliver linked web resources, commonly through web protocols such as HTTP/HTTPS.
Describe purpose, characteristic and consequence
Paper 1-style mini-set
1. Describe one characteristic of a VPN.
2. Describe one benefit and one limitation of edge computing.
3. A school connects computers within one campus and also accesses cloud applications. Identify the local network type and describe how the cloud service depends on wider digital infrastructure.
- A VPN creates a protected logical connection across another network, allowing private network access/traffic over infrastructure such as the public internet.
- Benefit: lower latency/reduced upstream traffic by processing close to the source. Limitation: edge devices may have constrained resources and require distributed maintenance/security.
- The campus network is a LAN. Cloud applications are hosted on remote networked infrastructure and reached through the internet, so reliable external connectivity and provider availability become part of the service.
Finish the learning cycle
IA — main task
Continue IA D wrap-up/documentation according to your current schedule. Keep evidence tied to real implementation choices.
Paper 1 — short practice
Create a one-page retrieval map for LAN/WAN/PAN/VPN plus internet/cloud/distributed/edge/mobile infrastructure. Include one benefit and limitation for each modern infrastructure.