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All Red Hat Enterprise Linux systems have some services already available to configure authentication for local users on local systems. These include: Authentication Setup The Authentication Configuration tool (authconfig) sets up different identity back ends and means of authentication (such as passwords, fingerprints, or smart cards) for the system. Identity Back End Setup The Security System Services Daemon (SSSD) sets up multiple identity providers (primarily LDAP-based directories such as Microsoft Active Directory or Red Hat Enterprise Linux IdM) which can then be used by both the local

Authentication is the process of confirming an identity. For network interactions, authentication involves the identification of one party by another party. There are many ways to use authentication over networks: simple passwords, certificates, one-time password (OTP) tokens, biometric scans. Authorization, on the other hand, defines what the authenticated party is allowed to do or access. Authentication requires that a user presents some kind of credential to verify his identity. The kind of credential that is required is defined by the authentication mechanism being used. There are several

红帽认证架构师（RHCA）课程主要面向负责部署和管理大型企业环境中众多系统的高级Linux系统工程师提供深入的实际操作培训。红帽认证架构师（RHCA）是红帽公司在红帽认证系统管理员（RHCSA）和红帽认证工程师（RHCE）认证之上推出的顶级认证，也是Linux领域公认的最受欢迎的、最成熟的认证。 参加RHCA考试需先通过红帽认证工程师(RHCE)的认证，每场考试都要提供RHCE的证书编号方可参加考试，针对五个方向共设五场考试，具体信息如下： EX401:系统管

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（A） 帐户名称（Account Name） — 等同于登录标识、用户标识或用户名。是指派给 UNIX/Linux 系统上用户的名称。可以在系统上对多个用户设置唯一的帐户名称，每个用户具有不同的访问（权限）级别。在安装完 Linux 之后，帐户名称由超级用户（Superuser）或 root 操作员指派。 AfterStep — 用户界面（窗口管理器）之一，AfterStep 使得 Linux 的外观很象 NeXTSTEP，而且还有些增强功能。要获取更多关于 AfterStep 的信息，请访问 www.afterstep.org。（另请参阅“Enli