Networking Intermediate

What is SSL/TLS Certificate?

A digital certificate that authenticates a website identity and enables encrypted HTTPS connections.

SSL/TLS certificates establish trust between browsers and servers. They contain the domain name, issuing Certificate Authority (CA), public key, and validity dates. When a browser connects to an HTTPS site, it verifies the certificate chain.

Types include Domain Validation (DV), Organization Validation (OV), and Extended Validation (EV). Let's Encrypt provides free DV certificates. Certificates must be renewed before expiration.

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Linux Networking Fundamentals

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Related Terms

VLAN (Virtual LAN)

A logical grouping of network devices that creates separate broadcast domains on the same physical network infrastructure.

Two transport layer protocols: TCP provides reliable, ordered delivery while UDP provides fast, connectionless delivery without guarantees.

A compact method for specifying IP addresses and their associated routing prefix using a slash followed by the prefix length.

A set of rules that control inbound and outbound traffic at the subnet level, acting as a stateless firewall in cloud and enterprise networks.

A device or software that distributes network traffic across multiple servers to ensure reliability and performance.

Network Segmentation

The practice of dividing a network into isolated segments to improve security, performance, and management.

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