15 extra multiple-choice questions for Domain Name System (DNS) (12th Standard Computer Applications, Samacheer Kalvi), beyond the ones printed in the textbook — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Who invented the Domain Name System (DNS) along with Jon Postel?
- A. Tim Berners-Lee
- B. Paul V. MockapetrisCorrect
- C. Vint Cerf
- D. Bob Metcalfe
Explanation. Paul V. Mockapetris, along with Jon Postel, invented the Internet Domain Name System (DNS) in 1983.
Q2
Which administrator of the Internet Assigned Numbers Authority (IANA) was famously known as the "God of the Internet"?
- A. Paul V. Mockapetris
- B. Jon PostelCorrect
- C. Vint Cerf
- D. Robert E. Kahn
Explanation. Jon Postel was an administrator of IANA and was widely referred to as the 'God of the Internet'.
Q3
Internet Protocol (IP) address is the logical address of which network layer?
- A. Application Layer
- B. Transport Layer
- C. Network LayerCorrect
- D. Physical Layer
Explanation. An IP address is a logical address that resides in the Network Layer of the OSI model to identify host systems.
Q4
If a protocol uses 'n' bits for addressing, what is the total address space of that protocol?
- A. n^2
- B. 2 * n
- C. 2^nCorrect
- D. n^2 - 1
Explanation. The address space is determined by the number of bits. If the protocol uses 'n' bits, the address space contains 2^n addresses.
Q5
What is the total number of unique addresses that can be formed using the 32-bit IPv4 protocol?
- A. 2^64
- B. 2^128
- C. 2^32Correct
- D. 2^16
Explanation. Since IPv4 uses 32 bits, the total address space is 2^32 unique addresses.
Q6
In an IPv6 address, the 128 bits are divided into how many 16-bit blocks?
- A. Four
- B. Six
- C. EightCorrect
- D. Ten
Explanation. IPv6 addresses consist of 128 bits divided into eight 16-bit blocks, with each block represented as 4 hexadecimal digits.
Q7
A standard Uniform Resource Locator (URL) consists of how many fundamental parts?
- A. Two
- B. Three
- C. FourCorrect
- D. Five
Explanation. A standard URL is composed of four main parts: protocol, hostname (domain name), folder name, and file name.
Q8
What is the major disadvantage of using a flat namespace in large network systems?
- A. It cannot support alphabetical characters.
- B. It must be controlled centrally to avoid ambiguity and redundancy.Correct
- C. It requires more bits than a hierarchical namespace.
- D. It cannot map names to IP addresses.
Explanation. Flat namespaces have no structure and require central control to prevent name conflicts, making them impractical for large systems.
Q9
The hierarchical domain name space tree structure can have a maximum of how many levels starting from the root?
- A. 63 levels
- B. 128 levelsCorrect
- C. 253 levels
- D. 256 levels
Explanation. The DNS tree structure can have a maximum of 128 levels, starting from level 0 (root) up to level 127.
Q10
What level number represents the root element in the Domain Name Space tree structure?
- A. Level 0Correct
- B. Level 1
- C. Level 127
- D. Level 128
Explanation. The root element at the very top of the hierarchical DNS tree structure is located at Level 0.
Q11
According to the basic rules of domain names, the entire domain name can be at most how many characters long?
- A. 63 characters
- B. 128 characters
- C. 253 charactersCorrect
- D. 255 characters
Explanation. The entire domain name (including all labels and dots) can be at most 253 characters long.
Q12
Which of the following symbols is permitted in a domain name according to DNS rules?
- A. Underscore (_)
- B. Hyphen (-)Correct
- C. Dollar sign ($)
- D. Exclamation mark (!)
Explanation. Domain names can contain alphabets, digits, and hyphens. Other special symbols like underscores, dollar signs, and exclamation marks are not allowed.
Q13
Country top-level domain names (cTLD) use how many characters to represent a country's abbreviation?
- A. Two charactersCorrect
- B. Three characters
- C. Four characters
- D. Variable length
Explanation. Country top-level domain names (cTLDs) strictly use a 2-character abbreviation corresponding to each country.
Q14
In Generic Top-Level Domains (gTLD), what is the specific usage associated with the ".info" domain extension?
- A. Networking organizations
- B. Information service providersCorrect
- C. Military groups
- D. Commercial organizations
Explanation. The '.info' generic top-level domain extension is specifically used for information service providers.
Q15
Which type of name server contains a zone's resource records that are directly updatable by the domain name holders?
- A. Root Name Server
- B. Secondary Name Server
- C. Primary Name ServerCorrect
- D. Local Name Server
Explanation. The primary name server contains the master zone resource records, which are updatable by the domain name owners.
About these Domain Name System (DNS) questions
These are the Additional multiple-choice questions for Domain Name System (DNS) from the Tamil Nadu State Board (Samacheer Kalvi) 12th Standard Computer Applications syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Domain Name System (DNS)?
This chapter has 15 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 12th Standard Computer Applications MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Domain Name System (DNS) book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
