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What is..........???

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What is Global Catalog Server?
A global catalog server is a domain controller it is a master searchable database that contains information about every object in every domain in a forest. The global catalog contains a complete replica of all objects in Active Directory for its host domain, and contains a partial replica of all objects in Active Directory for every other domain in the forest. It have two important functions:
·                                 Provides group membership information during logon and authentication
·                                 Helps users locate resources in Active Directory
What is IPv6?
Internet Protocol version 6 (IPv6) is a network layer IP standard used by electronic devices to exchange data across a packet-switched internetwork. It follows IPv4 as the second version of the Internet Protocol to be formally adopted for general use.  ip v6 it is a 128 bit size address. This is total 8 octants each octant size is 16 bits separated with “:”, it is in hexa decimal format. These 3 types:
1.             unicast address
2.             multicast address
3.             anycast address

loopback address of ip v6 is ::1

What is Active Directory schema?
The Active Directory schema contains formal definitions of every object class that can be created in an Active Directory forest it also contains formal definitions of every attribute that can exist in an Active Directory object.

Active Directory stores and retrieves information from a wide variety of applications and services.

Describe the lease process of the DHCP server.
DHCP Server leases the IP addresses to the clients as follows: 

DORA
D (Discover) : DHCP Client sends a broadcast packets to identify the dhcp server, this packet will contain the source MAC.
O (Offer) : Once the packet is received by the DHCP server, the server will send the packet containing Source IP and Source MAC.
R (Request) : Client will now contact the DHCP server directly and request for the IP address.
A (Acknowledge) : DHCP server will send an ack packet which contains the IP address.

What is the ntds.tit file default size?
 Ans: 40 MB 

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