Web Science/Part1: Foundations of the web/Domain Name System/Review some facts about DNS

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Review some facts about DNS


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1 What kind of questions can be answered by DNS?

Which ipv4 address belongs to a domain?
What is the name server of a domain?
Which ipv6 address belongs to a domain?
Is there a mail server existing for this domain?
What is the canonical name of a domain?

2 Which of the following statements are true?

All hosts in a domain must be in the same network
A domain can be attached to various name servers
A domain can be resolved to various IP addresses
A domain can be resolved either to an IPv4 or an IPv6 address.
All hosts in a domain must be in the same geographical region.
DNS will always resolve the IP address that is geographically closest to you.
DNS can be used for load balancing

3 Which of the following statements about the connection between DNS and IP routing hold true?

DNS is built on top of IP.
In order to resolve addresses and make DNS queries IP routing will be used most of the time to speak to the various name servers.
Root name servers do not need to have an IP address.
Root name servers are not necessary if you have a local copy of the root.zone file.
IP routing is hierarchical.
DNS is hierarchical.