HTTPS

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

HTTPS is a protocol for transferring web resources over HTTP with protection provided by TLS.

HTTPS transfers web resources over HTTP with protection provided by TLS. It is a Layer 7 application protocol used by web browsers and web servers. section 4.3.1

A browser request using HTTPS involves several networking layers:

• Addresses the web server’s HTTPS service at Layer 4 port 443. section 4.3.1
• Uses TCP to check that messages reach their destination. section 4.3.1
• Relies on Layers 2 and 3 to deliver the message hop by hop and end to end. section 4.3.1

Figure 4.1 A web browser on PC1 uses a Layer 7 protocol (HTTPS) to request a web page from the web server on SRV1. Layers 2, 3, and 4 work together to deliver the message to the appropriate application on SRV1. Layer 1 is the medium over which the communication occurs.

Trace a browser request from PC1 to the web server on SRV1 through Layers 1–4. section 4.3.1

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes

Identifies HTTPS as a Layer 7 protocol, its TCP relationship, and port 443, but does not explain TLS internals.

Examples

Uses a browser request from PC1 to SRV1 and a server with open ports 53, 80, and 443.

What it assumes

Assumes basic awareness of TCP/IP layers while distinguishing application protocols from transport ports and physical device ports.

What you can do after

Evaluate HTTPS traffic by recognizing its application-layer role, TCP transport, and destination port 443.

How it connects

Connects HTTPS with HTTP, TLS, TCP, application-layer protocols, and the TCP/IP networking model.

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Also explained in

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  Build Python Web Apps with StreamlitHTTPS is the secure version of HTTP that protects web communication using TLS encryption and server authentication.
• 

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  ASP.NET Core in Action, 3eHTTPS is HTTP secured with Transport Layer Security to provide encrypted and authenticated communication.
• 

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  Grokking Web Application SecurityHTTPS is HTTP protected by Transport Layer Security for authenticated and encrypted communication.
• 

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  Spring Security in Action, Second EditionHTTPS is HTTP transmitted through TLS to provide encrypted communication and server authentication.
• 

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  Data Pipelines with Apache Airflow, Second EditionHTTPS is the secure form of HTTP that uses Transport Layer Security to authenticate endpoints and encrypt communication.
• 

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  .NET in Action, Second EditionHTTPS is HTTP carried over a TLS-protected connection.

Compare how 7 books explain HTTPS →

Related concepts

• HTTPcontrasts with · HTTP is a standardized application-layer protocol that defines request-and-response messages for transferring resource representations between networked systems.
• TLSuses · Transport Layer Security (TLS) is a cryptographic protocol that protects network communications through confidentiality, integrity, and authentication of communicating endpoints.
• TCPuses · TCP is a connection-oriented transport-layer protocol that provides reliable, ordered delivery of byte streams between network endpoints.
• port numberuses · A port number is a numeric transport-layer identifier that directs network traffic to a service or application endpoint on a host.
• hsts headerconfigured by · The Strict-Transport-Security header is an HTTP response header that instructs user agents to access a site only through HTTPS for a specified period.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 1 Fundamentals and Protocols. The section links point to the parts of the book it draws on.