(5) What is meant by Global Catalog ?
Global Catalog is distribution repository of objects either partially or searchable in every domain in multi domain Active Directory Services (AD DS) forest.
Global Catalog stored in the domain is act as Global Catalog server because it stores the information about the objects in itself. It will locate the object where ever it resides in the forest.
https://technet.microsoft.com/en-us/library/cc728188(v=ws.10).aspx
(6) What is the port number of GC in Active Directory to access it ?
PORT 3268 is the port number of GC in Active Directory to access it using LDAP Services
(7) What is FSMO ?
FSMO – Flexible Single Master Operator, in multidomain  or single domain forest only a single Domain  Controller will act and perform  as a FSMO role / functions.
They Are
- Schema Master
- Domain Naming Master (forest wide)
- PDC Emulator (domain wide)
- RID Master (domain wide)
- Infrastructure Master (domain wide)Â
We can use NTDSUTIL to transfer the FSMO roles from one DC to another DC
https://support.microsoft.com/en-us/kb/223346
(8) What is NTP ?
NTP is Network Time Protocol used to synchronise the time between different Domain Controllers in the forest.
w32tm – used to synchronise the time and below commands to monitor and update the timings as per NTP.
w32tm /config  /update,     w32tm /resync,   w32tm /monitorÂ
(9) Can you define different types of groups and their catagories.
Active Directory Groups have three group scopes:
- Domain local
- Domain global
- universal
Each group can have distribution and security
(10) What is meant by Schema ?
Schema – a set of definitions define the kind of objects in the Active Directory. Object class and its attributes are part of schema.
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