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Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Introduction

This document describes the basic concepts of Secure Sockets Layer (SSL) protocol, and provides a sample transaction and packet capture.

SSL Record Overview

The basic unit of data in SSL is a record. Each record consists of a five-byte record header, followed by data.

Record Format

Type Version Length
T VH VL LH LL

Record Type

There are four record types in SSL:

Record Version

The record version is a 16-bits value and is formatted in network order.