In www.elearnsecurity.com, which part is the domain name (second-level domain)?

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Multiple Choice

In www.elearnsecurity.com, which part is the domain name (second-level domain)?

Explanation:
In DNS, a domain name is made of labels separated by dots, from left to right: a host or subdomain, then the second-level domain, then the top-level domain. In www.elearnsecurity.com, the leftmost label is the host or subdomain (often used for web services), the label right before the top-level domain is the second-level domain, and the final label is the top-level domain. Here, elearnsecurity sits directly to the left of the top-level domain .com, so it is the second-level domain. The label www is the host part, and .com is the top-level domain, so the best answer is elearnsecurity.

In DNS, a domain name is made of labels separated by dots, from left to right: a host or subdomain, then the second-level domain, then the top-level domain. In www.elearnsecurity.com, the leftmost label is the host or subdomain (often used for web services), the label right before the top-level domain is the second-level domain, and the final label is the top-level domain. Here, elearnsecurity sits directly to the left of the top-level domain .com, so it is the second-level domain. The label www is the host part, and .com is the top-level domain, so the best answer is elearnsecurity.

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