MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

1. What is a forward lookup query and how is it resolved?
Lesson 3 Overview of Name Resolution
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2. In DNS name resolution, which of the following statements about TTL are correct?
(Choose all that apply.)
a. TTL is the length of time a query can exist before it is discarded.
b. Shorter TTL values help ensure that data about the domain namespace is
more current across the network.
c. Longer TTL values increase the amount of DNS traffic.
d. Longer TTL values cause the cached values to be retained longer.
3. Which of the following statements about DNS name and address resolution are
correct? (Choose all that apply.)
a. The DNS distributed database is indexed by both names and IP addresses.
b. The top-level domain in-addr.arpa is used for both forward and reverse queries.
c. In the in-addr.arpa domain, the order of the IP address octets is reversed.
d. Troubleshooting tools, such as the nslookup command-line tool, use reverse
lookup queries to report back host names.
Lesson Summary
■ A forward lookup query resolves a name to an IP address, and a reverse lookup
query resolves an IP address to a name.
■ Name servers cache query results to reduce DNS traffic on the network.
■ The DNS distributed database is indexed by name, not by IP address, so inaddr.arpa
(a special second-level domain) was created. It is based on IP addresses
instead of domain names.