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

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

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Page<br />

13-36<br />

Questions and Answers<br />

13-51<br />

4. ________________ provide a way to partition the domain namespace into manageable<br />

sections, and each ________________ represents a discrete portion of the<br />

domain namespace.<br />

Zones; zone<br />

Lesson 3 Review<br />

1. What is a forward lookup query and how is it resolved?<br />

A forward lookup query is the resolving of a user-friendly DNS domain name to an IP address.<br />

To resolve a forward lookup query, a client passes a lookup query to its local name server. If the<br />

local name server can resolve the query, it returns the IP address for the name so the client can<br />

contact it. If the local name server cannot resolve the query, it passes the query on to one of<br />

the DNS root servers. The DNS root server sends back a referral to a name server that can<br />

resolve the request. The local name server sends the request to the name server it was<br />

referred to by the DNS root server. An IP address is returned to the local name server and the<br />

local name server sends the IP address to the client.<br />

2. In DNS name resolution, which of the following statements about TTL are correct?<br />

(Choose all that apply.)<br />

a. TTL is the length of time a query can exist before it is discarded.<br />

b. Shorter TTL values help ensure that data about the domain namespace is<br />

more current across the network.<br />

c. Longer TTL values increase the amount of DNS traffic.<br />

d. Longer TTL values cause the cached values to be retained longer.<br />

The correct answers are A, B, and D. C is not correct because longer TTL values do not increase<br />

DNS traffic, but shorter TTL values can increase it.<br />

3. Which of the following statements about DNS name and address resolution are<br />

correct? (Choose all that apply.)<br />

a. The DNS distributed database is indexed by both names and IP addresses.<br />

b. The top-level domain in-addr.arpa is used for both forward and reverse queries.<br />

c. In the in-addr.arpa domain, the order of the IP address octets is reversed.<br />

d. Troubleshooting tools, such as the nslookup command-line tool, use reverse<br />

lookup queries to report back host names.<br />

The correct answers are C and D. A is not correct because the DNS database is indexed by<br />

name, not by IP address. B is not correct because the top-level domain in-addr.arpa is used for<br />

reverse lookup queries, but not for forward lookup queries.

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