13. Lesson 12

*What is the maximum length for a fully qualified domain name, including the trailing period?* a. 50 characters b. 63 characters c. 255 characters d. 255 characters for each individual domain name

255 characters

*Which of the following would be the correct FQDN for a resource record in a reverse lookup zone if the computer's IP address is 10.75.143.88?* a. 88.143.75.10.in-addr.arpa b. 10.75.143.88. in-addr.arpa c. in-addr.arpa.88.143.75.10 d. arpa.in-addr. 10.75.143.88

88.143.75.10.in-addr.arpa

*The IPv6 DNS host record is referred to as a(n):* a. A record b. AA record c. AAA record d. AAAA record

AAAA record

*What client applications utilize Domain Name System (DNS) to resolve host names into IP addresses?* a. Client web browsers, or any application that uses HyperText Transfer Protocol (HTTP) use DNS to resolve host names into IP addresses. b. All Internet applications working with host names must use DNS to resolve host names into IP addresses. c. Any application on a system that has connectivity to the Internet use DNS to resolve host names into IP addresses. d. DNS does not resolve host names into IP addresses.

All Internet applications working with host names must use DNS to resolve host names into IP addresses.

*A DNS server that hosts a primary or secondary zone containing a particular record can issue the following response to a query for the record:* a. Authoritative answer b. Non-authoritative answer c. Referral answer d. Non-referral answer

Authoritative answer

*What are some best practices when creating internal DNS namespaces.* a. Avoid an excessive number of domain levels. b. Keep domain names full and descriptive; avoid concise subdomains. c. Place less importance on a convention compared to spelling. d. Never abbreviate.

Avoid an excessive number of domain levels.

*This DNS configuration item will forward DNS queries to different servers based on the domain name of the query.* a. Iterative forwarder b. Recursive forwarder c. Conditional forwarder d. IPv6 forwarder

Conditional Forwarder

*In the fully qualified domain name www.sales.contoso.com, which of the following is the second-level domain?* a. www b. sales c. contoso d. com

Contoso

*What is the primary purpose of name caching?* a. Name caching saves extraordinary amount of time for the user. b. Name caching greatly reduces traffic on the company network. c. Name caching validates why you should deploy caching-only servers. d. Name caching enables the second name resolution request for the same name to bypass the referral process.

Name caching enables the second name resolution request for the same name to bypass the referral process.

*What is the primary benefit of a DNS forwarder?* a. Exchanging iterative queries for recursive queries across the network perimeter b. Reducing the traffic and making efficient use of available bandwidth across the network perimeter c. Making the most of iterative queries to other DNS servers d. Reducing the burden on the Internet's root name servers

Reducing the traffic and making efficient use of available bandwidth across the network perimetter

*Which of the following is not one of the elements of the Domain Name System (DNS)?* a. resolvers b. relay agents c. name servers d. name space

Relay agents

*The following feature is available only on Active Directory-integrated DNS zones:* a. Dynamic updates b. Incremental zone transfers c. Reverse lookup zones d. Secure dynamic updates

Secure dynamic updates

*What are the dangerous consequences of a poorly chosen Time To Live (TTL)?* a. Specifying a TTL that is too long can greatly increase traffic, especially to the root name and top-level domain servers. b. Specifying a TTL that is too long can delay referrals from being propagated. c. Specifying a TTL that is too short can overburden root name and top-level domain servers with requests. d. Specifying a TTL that is too short can cause incorrectly cached information to remain before changes get recorded

Specifying a TTL that is too short can overburden root name and top-level domain servers with requests.

*Data from a primary zone is transmitted to secondary zone using the following:* a. Zone transfer b. Zone transmission c. DNS Zone d. Active Directory replication

Zone Transfer