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For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed.
Google Public DNS is a Domain Name System (DNS) service offered to Internet users worldwide by Google.It functions as a recursive name server.Google Public DNS was announced on December 3, 2009, [1] in an effort described as "making the web faster and more secure."
During the development of the first version of the Internet Protocol in the 1970s, the initial experimental versions 1 to 3 were not standardized.
In both Windows and Linux, when selecting which of a host's IP address to use as a source IP, a program may specify INADDR_ANY (0.0.0.0). [ 3 ] [ 4 ] In Linux a program may specify 0.0.0.0 as the remote address to connect to the current host (AKA localhost ).
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A Big Boy locomotive.This example is Union Pacific 4014. 4-8-8-4 wheel arrangement. A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck.
Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-8-2 has two leading wheels, four sets of eight driving wheels, and two trailing wheels. Because of its length, such a locomotive must be an multiplex locomotive. It is longer than a normal articulated locomotive; the fourth set of drivers is located under the tender.
The Northern Pacific Railway was the first railroad to order a 2-8-8-4. The first was built in 1928 by American Locomotive Company; at the time, it was the largest locomotive ever built.