Registration gives the exclusive right to use the mark in respect of goods or services for which it was registered.
Contrary to widespread use of both terms as synonyms, a trademark is an identifier or “face” of the brand, not the brand itself.
Can a Trademark registered in one country is considered registered and protected in other countries.
No, the owner have to get the registration of his Trademark in all the countries where he want his brand to be protected, through the government authorities of the concerned.
Yes, with the evolution of IP laws, we now have provisions through which we can get Trademark protection for color combinations and smells/scents/fragrances.
Trademark protection is available to 10-15 years depending from country to country. however if the Trademark protection is timely renewed then its shall stay in the ownership for perpetually. Some Trademarks like Mercedes and Pepsi have existed and are registered in the name of the owners for more then 100 years.