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Objective Questions on Application Layer in OSI/TCP/IP Model set-3


1) In a/an ........... of DNS resolver, instead of supplying a name and asking for an IP address, the DNS client provides the IP address and requests the corresponding host name.

A. Recursive queries

B. Iterative queries

C. Reverse queries

D. Inverse queries


2) For each resolved query, the DNS resolver caches the returned information for a time that is specified in each resource record in the DNS response. This is known as .........

A. Positive caching

B. Time To Live

C. Negative Caching

D. Reverse Caching


3) As originally defined in RFC 1134, .............. negative caching is the caching of failed name resolutions.

A. Positive caching

B. Time To Live

C. Negative Caching

D. Round Robin Load Balancing


4) ............... can reduce response times for names that DNS cannot resolve for both the DNS client and DNS servers during an iterative query process.

A. Positive caching

B. Time To Live

C. Negative Caching

D. Round Robin Load Balancing


5) The amount of time in seconds to cache the record data is referred to as the .........

A. Time To Cache

B. Time To Live

C. Time For Record

D. Time To Save


6) Which of the following issues arises, when multiple resource records for the same resource record type exist.

A. For the DNS server, how to order the resource records in the DNS Name Query Response message.

B. For the DNS client, how to choose a specific resource record in the DNS Name Query Response message.

C. Both of the above

D. None of the above.


7) To address the issues arises when multiple resource records for the same resource record type exist, RFC 1794 describes a mechanism named ................. to share and distribute loads for network resources.

A. Positive caching

B. Time To Live

C. Negative Caching

D. Round Robin Load Balancing


8) A ............ gets the data for its zones from locally stored and maintained files.

A. primary name server

B. secondary name server

C. ternary name server

D. primary name client


9) A ............. gets the data for its zones across the network from another name server.

A. primary name server

B. secondary name server

C. ternary name server

D. primary name client


10) The process of obtaining zone information across the network is referred to as a .........

A. zone obtaining

B. zone transfer

C. zone information

D. zone extracting


11) Which of the following is/are the reasons to have secondary name servers within an enterprise network.

A. Redundancy

B. Remote locations

C. Load distribution

D. All of the above


12) The source of the zone information for a secondary name server is referred to as a ..........

A. Name server

B. Primary Name Server

C. Master Name Server

D. Secondary Name Server


13) In .......... , when a name server receives a DNS query that it cannot resolve through its own zone files, it sends a recursive query to its forwarder.

A. exclusive mode

B. non-exclusive mode

C. caching mode

D. zonal mode


14) Which of the following is not the work done by a name server using a forwarder in exclusive mode, when attempting to resolve a name.

A. Checks its local cache

B. Checks its zone files

C. Sends a recursive query to a forwarder

D. Attempts to resolve the name through iterative queries to other DNS servers.


15) In ..........., name servers rely on the name-resolving ability of the forwarders.

A. exclusive mode

B. non-exclusive mode

C. caching mode

D. zonal mode


16) Name servers in ........... make no attempt to resolve the query on their own if the forwarder is unable to satisfy the request.

A. exclusive mode

B. non-exclusive mode

C. caching mode

D. zonal mode


17) ........... are DNS servers that only perform queries, cache the answers, and return the results.

A. Querying only server

B. Results only server

C. Caching only server

D. Information only server


18) In DNS resource records, ............ indicate primary and secondary servers for the zone specified in the SOA resource record, and they indicate the servers for any delegated zones.

A. SOA records

B. A records

C. MX records

D. NS records


19) In DNS resource records,......... specifies a mail exchange server for a DNS domain name.

A. SRV

B. MX

C. PTR

D. NS


20) In DNS resource records, .......... specifies the IP addresses of servers of a specific service, protocol and DNS domain.

A. SRV

B. MX

C. PTR

D. NS


Answers:

1) C. Reverse queries
2) A. Positive caching
3) C. Negative Caching
4) C. Negative Caching
5) B. Time To Live
6) C. Both of the above
7) D. Round Robin Load Balancing
8) A. primary name server
9) B. secondary name server
10) B. zone transfer
11) D. All of the above
12) C. Master Name Server
13) B. non-exclusive mode
14) D. Attempts to resolve the name through iterative queries to other DNS servers.
15) A. exclusive mode
16) A. exclusive mode
17) C. Caching only server
18) D. NS records
19) B. MX
20) A. SRV


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