Which other name server addresses do DNS name servers hold by default, and why?

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A DNS name server holds the addresses of one or more root servers, so that all parts of the name space can be reached. It stores the addresses of servers storing subdomains (thus a server for qmul.ac.uk stores addresses of servers for dcs.qmul.ac.uk). Thirdly, it is often convenient for it to store the addresses of servers storing its parent domain (thus a server in dcs.qmul.ac.uk knows the addresses of servers storing qmul.ac.uk).

Computer Science & Information Technology

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How many binary digits are in an IPv4 address?

A. 4 B. 8 C. 16 D. 32

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In the figure above, which number refers to the current reference point?

A. 1 B. 2 C. 3 D. 4

Computer Science & Information Technology