CC by Aru ✅ Net Range From an IP + subnet mask, we can calculate all characteristics of the LAN. Net range = all important addresses inside a network. ✅ Example Host IP: ...

CC by Aru ✅ IP Addresses (IPv4) The IPs discussed here are IPv4. IPv6 exists but is less widespread. IPv6 addresses are longer. ✅ What is an IP Address? An IP address identifies co...

CC by Aru 💡 Layer 3: Transport Layer Service in charge of breaking information into pieces. Pieces must be less than or equal to 64 KB. Pieces can travel using: TCP ...

CC by Aru ✅ 7.4 Protocols Protocols = books or rules for different applications. ☑️ Application Layer Protocol Categories 1 book for naming things. 2 books for IP configuration. 3 bo...

CC by Aru ✅ 7.3 TCP/IP Model vs OSI Model ☑️ Models and Protocols ✔️ What is a model? A model is a structure with layers used to explain how the internet works. ✔️ What is a protocol? ...

CC by Aru 💡 Subnetting Subnetting = dividing a class network into smaller subnetworks. ☑️ Purpose Avoid wasting IP addresses. Organize companies into smaller groups/floors/departments....

✅ Visitor Pattern add new operations to existing object structures without modifying those classes 👉🏻 separate algorithms(operations) from the objects on which they operate 👀 Shap...

✅ Presentation Layer check parameter from front end ✅ MockMVC use Mock(fake data) to test MVC To test controller, make service and repository a mock data How to use? need tw...

✅ Business Logic (1) As a cafe manager, create products (2) product number should be created automatically 📌 Business for Product Service @Transactional(readOnly = true) @RequiredArgsConst...

✅ Linux file system: ext2, 3, 4 ✅ Rules of files in linux 1️⃣ Files do not have extensions unless, you want to add an extension on purpose if you add an extension it becomes part of ...