Answer:
I think it is the last 2 but i am not 100% sure.
Explanation:
The correct answer is Search Sites
It forms a critical role of the website UI. It is more or less the same as a search engine. It collects and organizes any content from every corner of the internet. Google.com is a good example. You can use it to locate anything on the internet and it will provide links to content that matches what you want.
Your answer should be False
Answer:
A concatenated index, also known as multi-column, composite, or combined index, is one index across multiple columns. In the case of queries with multiple equality conditions, even though multiple single-column indexes can result in a very good performance, a single concatenated index solution is preferable.
Answer:
Transport layer
establishes, maintains and terminates network connections
Network layer
ensures the reliability of link
Data link layer
provides functions to guarantee reliable network link
Physical layer
controls transmission of the raw bit stream over the medium
Explanation:
see Answer