2 Chapter 1. Red Hat Network Overviewdeployment of systems, including the configuration of the Red Hat Update Agent for eachsystem.The Red Hat Network Daemon (rhnsd) runs in the background as a service andprobes the Red Hat Network for notifications and updates at set time intervals (seeChapter 3 Red Hat Network Daemon for further information). This daemon is necessaryin order to schedule updates or other actions through the website.The Red Hat Network Registration Client allows you to register your Red HatEnterprise Linux 2.1 systems with RHN. (Newer versions of Red Hat EnterpriseLinux have registration functionality built into the Red Hat Update Agent.) SeeChapter 5 Red Hat Network Registration Client for more information.Many Red Hat Network terms are used throughout this manual. As you read the Red HatNetwork Reference Guide, refer to the Glossary as necessary for an explanation of commonterms.TipFor a comparison chart of RHN service levels, refer tohttp://www.redhat.com/software/rhn/table/.1.1. UpdateThe RHN Update service is ideal for a user with one Red Hat Enterprise Linux system ora small number of Red Hat Enterprise Linux systems. Updated Subscription to Update canbe purchased at https://www.redhat.com/apps/commerce/rhn/.With each Update subscription, you receive the essential functionality provided to Demousers, plus:• Easy ISOs — For customers who have purchased subscriptions to Red Hat Network,ISO images are available for immediate download.• Priority Access during periods of high load — When Red Hat releases a large erratum,users with Priority Access can be guaranteed that they will be able to access the updatedpackages immediately.• RHN Support Access — All paying customers of Red Hat Network receive web basedsupport for their RHN questions.• Errata Notification, Multiple Systems — Subscriptions for multiple systems means Er-rata notification for Errata to all of those systems. Note that only one email is distributedper each Erratum, regardless of the number of systems affected.• Errata Updates, Multiple Systems — Get quick updates for multiple systems with aneasy button click for each system.
