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Domain Name System (or Service or Server) is an internet service that translates domain names into IP addresses. For example the domain name www.example.com might translate to 198.105.232.4 Fully Qualified Domain Name (FQDN) A fully qualified domain name (FQDN) is the complete domain name for a specific computer, or host, on the Internet. The FQDN consists of two parts: the hostname and the domain name. For example, a Fully Qualified Domain Name for a hypothetical mail server might be mymail.som
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  Domain Name System  (or Service or Server) is an internet service that translates domain names into IP addresses.  For example the domain name www.example.com might translate to 198.105.232.4 Fully Qualified Domain Name (FQDN) A fully qualified domain name (FQDN) is the complete domain name for a specific computer, or host, on the Internet.  The FQDN consists of two parts: the hostname and the domain name . For example, a Fully Qualified Domain Name for a hypothetical mail server might be mymail . somecollege.edu .   The hostname is mymail ,  and the host is located within the domain somecollege.edu. Unicode:    As Internet and intranet systems have evolved, various code pages have enabled national characters to be displayed, but collaboration on the Web has led to a huge number of language-specific, platform-dependent code pages that must all comply with each other. This compliance is only possible through Unicode- a widespread, accepted international standard that supports virtually all of the world's scripts.    Implementing the Unicode standard enables a single software product or a single web site to be accessed across multiple platforms, languages and countries    It allows data to be transferred across many different SAP and non-SAP systems without corruption.    As of SAP Netweaver 7.1 , the concept and naming of SAP system instances has changed. The terms “central instance” and “dialog instance” are no longer used . Instead, the SAP system consists of the following instances:    Application server instances: Application server instances can be installed as “primary application server instance” (PAS) or “additional application server instances” (AAS).       Central services instance    Database instance ASCS instance   ABAP SAP central services instance (Message server +Enqueue server ES is optional) PAS instance    Primary application server instance(ABAP dispatcher+w.p’s+gateway+icm+igs)  ERS   Enqueue replication server ( separate instance can also be installed) SAP Host Agent is a tool that you can use  for monitoring and control of SAP instances and non-SAP instances, operating systems, and databases. The host agent runs with the Operating system user sapadm . You only need to install SAP Host Agent separately in the following cases:    There is no SAP system or instance on the host.    The SAP system or instance running on the host has a kernel release lower than SAP kernel 7.20 and the host does not yet have an SAP Host Agent.     You have upgraded your SAP system to a release with a kernel release lower than SAP kernel 7.20 and the host of the upgraded system or instance does not yet have an SAP Host Agent. Diagnostics agent Which agent version should be used? Before starting the installation you need to identify the Diagnostics Agent version that complies with the version of the Solution Manager system. Solution Manager Managed Version Diagnostics Agent Version / SAP Note Versions 7.00 (prior to EhP1) 6.40, 7.0, 7.0 EhP1 & 2, 7.1 EhP1,7.2 7.01 SR1 SAP Note 1357812 Versions 7.0 EhP1 >= SP 18 6.40, 7.0, 7.0 EhP1 & 2, 7.1 EhP1,7.2 7.01 SR1 SAP Note 1357812 Versions 7.0 EhP1 >= SP 20 (SP4 SP2) 6.40, 7.0, 7.0 EhP1 & 2, 7.1 EhP1,7.2 7.20 SAP Note 1368413 Versions 7.1 6.40, 7.0x, 7.1x, 7.2x, 7.3 7.3 SP02 SAP Note 1448655 Differences between Standard, Distributed, and High-Availability system installation types:    Standard - PAS, DB, and SCS run on single host     Distribute  - PAS, DB and SCS run on different hosts     High availability  - PAS, DB, ASCS, SCS each run on separate host (dual stack).     Both ASCS and SCS run in a switchover cluster infrastructure. ASCS and SCS must have their own Enqueue replication server (ERS) instance. 
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