DHCP Server - Basics

DHCP (Dynamic Host Configuration Protocol) is a client-server technology that allows DHCP servers to assign or lease IP addresses to DHCP clients. DHCP server offers its clients, IPv4/IPv6 addresses to a specified period of time. A DHCP server provides IP addresses to a DHCP client through the exchange of a series of messages, which the process is termed DORA (Discover Offer Request Acknowledgement).

What DORA process is?

Port Number - Basics

Port, may be an application specific or process specific endpoint to a logical connection. This tells a way a client program specifies a specific server program on a computer in a network. The port acts as a contact port for an application or a process in the host system. Port numbers determine the logical endpoints of a connection.

Based on port numbers, ports are mainly classified as:

Active Directory Replication - Advanced

In a complex model of several dc’s, replication would be complex since the dc’s will replicate the same data in an endless manner. Here comes UDTV for the help.

Up-to-dateness vector (UTD or UDTV) is a replication attribute which avoids endless replication. Each dc maintains a UDTV table for every other dc’s. This is as per the following naming context scenario:

                For Domain NC, each dc in a domain maintains every other dc’s UDTV values.

                For schema and Configuration NC’s, this is done for every dc in the forest.

Windows Certificate Types

Windows Azure cloud services use several types of certificates in which the main two among them includes the pfx and cer. pfx certificate is used as an encryption certificate where as management certificates have the extension of cer. Now, what is the difference between pfx and cer?

Active Directory Replication

Active Directory Domain Services (ADDS) is a distributed directory service which stores objects, here referred to real world entities such as users, groups, computers etc. Objects in the directory are distributed among all domain controllers in a forest. ADDS replication is the process by which any changes applied to one domain controller are automatically transferred to other domain controllers and global catalogs.

Remediation Servers

The term remediation means correction. As its name implies, remediation is the process of correcting something, here it refers to the process of correcting a client’s non- compliant health state to a compliant state.

While configuring NAP, it is possible to set some policies that must be applied on NAP clients. Only those who comply with NAP policies can access the network and enjoy the services. But what if the client’s health state doesn't comply with NAP policies? This is where remediation servers play their role.