By comparison, a signature is a stylized script associated with a person. In commerce and the law, a signature on a document is an indication that the person adopts the intentions recorded in the document. Both are comparable to a seal. In many instances, common with engineering companies for example, digital seals are also required for another layer of validation and security.
Network Address Translation (NAT) is a way to map an entire network (or networks) to a single IP address. NAT is necessary when the number of IP addresses assigned to you by your Internet Service Provider is less than the total number of computers that you wish to provide internet access for. NAT is described in RFC 1631. NAT allows you to take advantage of the reserved address blocks described in RFC 1918.
NATS. NATS is the UK's leading provider of air traffic control services. Each year we handle 2.2 million flights and 220 million passengers in UK airspace. In addition to providing services to 14 UK airports, we work in more than 30 countries around the world spanning Europe, the Middle East, Asia and America.