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What's PPPoE?
 

PPPoE, Point-to-Point Protocol over Ethernet, is a network protocol?for encapsulating PPP frames inside Ethernet frames. It is used mainly with ADSL services where individual users connect to the ADSL transceiver (modem) over ethernet. Using PPPoE, users can virtually "dial" from one machine to another over an ethernet network, establish a point to point connection between them and then transport data packets over the connection. ---by http://en.wikipedia.org

 

What's DHCP?
 

The Dynamic Host Configuration Protocol (DHCP) is a set of rules used by communications devices such as a computer, router or network adapter to allow the device to request and obtain an IP address from a sever which has a list of addresses available for assignment.

DHCP is a protocol used by networked computers (clients) to obtain IP addresses and other parameters such as the default gateway, subnet mask, and IP addresses of DNS servers from a DHCP server. The DHCP server ensures that all IP addresses are unique, e.g., no IP address is assigned to a second client while the first client's assignment is valid (its lease has not expired). Thus IP address pool management is done by the server and not by a human network administrator. ---by http://en.wikipedia.org

 

What's DNS?

 

On the Internet, the Domain Name System (DNS) associates various sorts of information with so-called domain names; most importantly, it serves as the "phone book" for the Internet: it translates human-readable computer hostnames, e.g. en.wikipedia.org, into the IP addresses that networking equipment needs for delivering information. It also stores other information such as the list of mail exchange servers that accept e-mail for a given domain. In providing a worldwide keyword-based redirection service, DNS is an essential component of contemporary Internet use.---by http://en.wikipedia.org

 

What's DDNS?

 

Dynamic DNS is a system which allows the domain name data held in a name server to be updated in real time. The most common use for this is in allowing an Internet domain name?to be assigned to a computer with a varying (dynamic) IP address. This makes it possible for other sites on the Internet to establish connections to the machine without needing to track the IP address themselves. A common use is for running server software on a computer that has a dynamic IP address, as is the case with many consumer Interent service providers.

To implement dynamic DNS it is necessary to set the maximum caching time of the domain to an unusually short period (typically a few minutes). This prevents other nodes on the Internet from retaining the old address in their DNS cache, so that they will typically contact the name server of the domain for each new connection.

Dynamic DNS is an integral part of Active Directory, due in part to the fact that domain controllers register their service records (a category of data in the Internet Domain Name System specifying information on available services.) in DNS so that other computers in the Domain (or Forest) can find them.---by http://en.wikipedia.org