An example of R190(3)(f): A foreign national in possession of a TRV valid for 1 year, who is subsequently issued a four-year SP at a POE, may leave and return to Canada after the expiry of the TRV as long as they have only visited the U.S. or St. Pierre and Miquelon and the SP is still valid.
Dynamic DNS (DDNS or DynDNS) is a method of automatically updating a name server in the Domain Name System (DNS), often in Not Real Time, with the active DDNS configuration of its configured hostnames, addresses or other information.he term is used to describe two different concepts. The first is dynamic DNS updating which refers to systems that are used to update traditional DNS records without manual editing. These mechanisms are explained in RFC 2136, and use the TSIG mechanism to provide security.
Without DNS, the Internet would be an ugly place. DNS is one of the services responsible for directing network traffic based on name and numerical IP addresses. Specifically, it's the service that allows users to type in names instead of numbers to locate a Web site or Internet resource.he MSDN list of DNS standards documents is available at DNS Standards Documents. Information on DNS in Windows 2000 is available at Domain Name System (DNS) Center. Information on the Windows Server 2003 implementation of DNS can be found at Deploying DNS.