Mastering Computer Networking and Programming: 30 Important Questions and Answers

1. Which layer of the OSI model is responsible for routing and forwarding of data packets?
  • a) Physical Layer
  • b) Data Link Layer
  • c) Network Layer
  • d) Transport Layer
Show Answer
Answer: c) Network Layer
2. What is the purpose of the TCP (Transmission Control Protocol)?
  • a) Reliable data transmission
  • b) Address resolution
  • c) Routing
  • d) Error detection
Show Answer
Answer: a) Reliable data transmission
3. What is the function of a router in a network?
  • a) Connect devices within a LAN
  • b) Connect different LANs
  • c) Filter spam emails
  • d) Manage DHCP leases
Show Answer
Answer: b) Connect different LANs
4. Which of the following is not a top-level domain (TLD) in the domain name system (DNS)?
  • a) .com
  • b) .net
  • c) .web
  • d) .org
Show Answer
Answer: c) .web
5. In networking, what does the acronym LAN stand for?
  • a) Local Area Network
  • b) Long Accessible Network
  • c) Large Array Network
  • d) Linked Application Node
Show Answer
Answer: a) Local Area Network
6. Which of the following is NOT a valid data type in C?
  • a) float
  • b) real
  • c) int
  • d) char
Show Answer
Answer: b) real
7. What is the output of the following code in C?
    int x = 5;
    printf("%d", x++);
  • a) 5
  • b) 6
  • c) 10
  • d) Error
Show Answer
Answer: a) 5
8. Which operator is used to access the value of a variable through a pointer in C?
  • a) . (dot)
  • b) -> (arrow)
  • c) : (colon)
  • d) = (equal)
Show Answer
Answer: b) -> (arrow)
9. What is the result of `3 + 4 * 2` in C?
  • a) 10
  • b) 14
  • c) 11
  • d) 7
Show Answer
Answer: b) 14
10. In C, what is the purpose of the `break` statement in a `switch` statement?
  • a) To exit the loop
  • b) To continue to the next case
  • c) To skip the current iteration
  • d) To exit the `switch` statement
Show Answer
Answer: d) To exit the `switch` statement
11. What is an object in C++?
  • a) A class definition
  • b) A data type
  • c) An instance of a class
  • d) A variable
Show Answer
Answer: c) An instance of a class
12. What is the primary purpose of inheritance in C++?
  • a) To create new classes
  • b) To implement polymorphism
  • c) To reuse and extend the functionality of existing classes
  • d) To hide the implementation details of a class
Show Answer
Answer: c) To reuse and extend the functionality of existing classes
13. Which keyword is used to allocate memory for a dynamic array in C++?
  • a) new
  • b) malloc
  • c) allocate
  • d) create
Show Answer
Answer: a) new
14. What is the output of the following code in C++?
    int x = 5;
    cout << x++;
  • a) 5
  • b) 6
  • c) 10
  • d) Error
Show Answer
Answer: a) 5
15. Which C++ standard library header is used to perform input and output operations?
  • a) iostream
  • b) stdlib
  • c) cmath
  • d) string
Show Answer
Answer: a) iostream
16. Which of the following is not a valid Python data type?
  • a) list
  • b) tuple
  • c) array
  • d) dict
Show Answer
Answer: c) array
17. What does the `len()` function in Python do?
  • a) Returns the length of a list or string
  • b) Computes the logarithm of a number
  • c) Calculates the absolute value of a number
  • d) Returns the largest item in a list
Show Answer
Answer: a) Returns the length of a list or string
18. What is the result of `3 ** 2` in Python?
  • a) 6
  • b) 9
  • c) 5
  • d) 8
Show Answer
Answer: b) 9
19. Which of the following is used to comment out a single line in Python?
  • a) # (pound/hash)
  • b) /* and */
  • c) -- (double hyphen)
  • d) // (double slash)
Show Answer
Answer: a) # (pound/hash)
20. What is the output of the following code in Python?
    x = "Hello"
    y = "World"
    print(x + " " + y)
  • a) Hello World
  • b) HelloWorld
  • c) Hello + World
  • d) Error
Show Answer
Answer: a) Hello World
21. In Microsoft Word, which keyboard shortcut is used to copy selected text or objects?
  • a) Ctrl + C
  • b) Ctrl + X
  • c) Ctrl + V
  • d) Ctrl + Z
Show Answer
Answer: a) Ctrl + C
22. In Microsoft Excel, which function is used to find the maximum value in a range of cells?
  • a) MAX()
  • b) SUM()
  • c) AVG()
  • d) MIN()
Show Answer
Answer: a) MAX()
23. In Microsoft PowerPoint, which view is used for creating and editing individual slides?
  • a) Slide Sorter View
  • b) Normal View
  • c) Outline View
  • d) Slide Master View
Show Answer
Answer: b) Normal View
24. In Microsoft Outlook, which folder is used to store sent emails?
  • a) Inbox
  • b) Outbox
  • c) Sent Items
  • d) Drafts
Show Answer
Answer: c) Sent Items
25. In Microsoft Access, what is the primary key used for?
  • a) Sorting records
  • b) Creating relationships between tables
  • c) Storing large text documents
  • d) Identifying unique records in a table
Show Answer
Answer: d) Identifying unique records in a table
26. Which Internet protocol is used for sending and receiving email messages?
  • a) HTTP
  • b) FTP
  • c) SMTP
  • d) TCP
Show Answer
Answer: c) SMTP
27. What does DNS stand for?
  • a) Domain Network Service
  • b) Dynamic Name Server
  • c) Domain Name System
  • d) Data Network Service
Show Answer
Answer: c) Domain Name System
28. How many bits are there in an IPv4 address?
  • a) 8
  • b) 32
  • c) 64
  • d) 128
Show Answer
Answer: b) 32
29. Which IP address range is reserved for private, internal networks?
  • a) 10.0.0.0 - 10.255.255.255
  • b) 172.16.0.0 - 172.31.255.255
  • c) 192.168.0.0 - 192.168.255.255
  • d) 169.254.0.0 - 169.254.255.255
Show Answer
Answer: c) 192.168.0.0 - 192.168.255.255
30. What protocol is used for secure communication over the Internet, often seen as "https://" in URLs?
  • a) FTP
  • b) HTTP
  • c) TCP
  • d) SSL/TLS
Show Answer
Answer: d) SSL/TLS
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