Question (Exercise 13.9)
Which other name server addresses do DNS
name servers hold by default, and why?
Answer :
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 qmw.ac.uk
stores addresses of servers for dcs.qmw.ac.uk). Thirdly, it is often convenient
for it to store the addresses of servers storing its parent domain (thus a
server in dcs.qmw.ac.uk knows the
addresses of servers storing qmw.ac.uk).
