📄️Computer Networks: Layers and Models
A computer network connects devices so they can exchange data. Networks are built in layers: each layer offers a service to the one above and hides the…
📄️Data Link Layer and LANs
The data link layer moves frames between devices on the same network segment.
📄️IP Addressing, Subnetting and Routing
An IPv4 address is 32 bits, written as four octets (192.168.10.25). It has a network part and a host part, separated by the subnet mask or CIDR prefix.
📄️Transport Layer: TCP and UDP
The transport layer provides process-to-process delivery using ports (0 to 65535).
📄️DNS and HTTP
The Domain Name System maps names to IP addresses.
📄️TLS and Network Security
TLS provides confidentiality, integrity and authentication for a connection. HTTPS is HTTP over TLS.
📄️What Happens When You Type a URL
A classic interview question that ties every layer together. Typing https://prepverse.vercel.app/docs and pressing Enter does roughly the following.