1. What is the primary purpose of a network?
- A) Entertainment
- B) Facilitating communication and data transfer
- C) Multiplayer gaming
- D) Sharing media only
Answer: B
2. Which of the following has seven layers?
- A) OSI Model
- B) TCP/IP Model
- C) IP
- D) HTTP
Answer: A
3. Which layer is responsible for data encryption in the OSI model?
- A) Physical Layer
- B) Data Link Layer
- C) Presentation Layer
- D) Network Layer
Answer: C
4. What does TCP stand for?
- A) Transmission Control Protocol
- B) Transfer Communication Protocol
- C) Transport Communication Process
- D) Transmission Communication Port
Answer: A
5. Which layer ensures data is transmitted without errors?
- A) Network Layer
- B) Data Link Layer
- C) Physical Layer
- D) Transport Layer
Answer: D
6. What protocol translates domain names into IP addresses?
- A) HTTP
- B) TCP
- C) DNS
- D) FTP
Answer: C
7. Which layer of the OSI model deals with routing packets?
- A) Data Link Layer
- B) Physical Layer
- C) Network Layer
- D) Application Layer
Answer: C
8. Which IP address class is reserved for multicast?
- A) Class A
- B) Class B
- C) Class C
- D) Class D
Answer: D
9. What is the default port for HTTP traffic?
- A) 443
- B) 80
- C) 22
- D) 25
Answer: B
10. Which layer is the first in the OSI model?
- A) Physical Layer
- B) Application Layer
- C) Transport Layer
- D) Network Layer
Answer: A
11. Which protocol provides connectionless, unreliable data transmission?
- A) TCP
- B) HTTP
- C) UDP
- D) FTP
Answer: C
12. MAC addresses are part of which OSI layer?
- A) Network Layer
- B) Data Link Layer
- C) Transport Layer
- D) Application Layer
Answer: B
13. What does DNS stand for?
- A) Domain Name System
- B) Direct Network Service
- C) Digital Naming System
- D) Data Network Structure
Answer: A
14. Which layer is responsible for packet switching?
- A) Application Layer
- B) Transport Layer
- C) Network Layer
- D) Data Link Layer
Answer: C
15. Which protocol is widely used for secure web browsing?
- A) HTTP
- B) HTTPS
- C) FTP
- D) SMTP
Answer: B
16. IPv4 addresses are represented in:
- A) Binary
- B) Hexadecimal
- C) Dotted decimal
- D) Octal
Answer: C
17. Which layer of the OSI model establishes connections?
- A) Physical Layer
- B) Session Layer
- C) Transport Layer
- D) Network Layer
Answer: B
18. What type of address is used at the data link layer?
- A) IP Address
- B) Port Number
- C) MAC Address
- D) URL
Answer: C
19. What does IP stand for?
- A) Internet Protocol
- B) Internal Protocol
- C) Internet Process
- D) Internet Path
Answer: A
20. Which layer directly provides services to the end user?
- A) Application Layer
- B) Transport Layer
- C) Network Layer
- D) Data Link Layer
Answer: A
21. UDP is often used for:
- A) Video streaming
- B) File transfers
- C) Web browsing
- D) Email transmission
Answer: A
22. How many bits are in an IPv6 address?
- A) 32
- B) 64
- C) 128
- D) 256
Answer: C
23. Which OSI layer handles error checking?
- A) Physical Layer
- B) Data Link Layer
- C) Network Layer
- D) Transport Layer
Answer: B
24. What protocol does DNS primarily use for queries?
- A) TCP
- B) UDP
- C) FTP
- D) HTTP
Answer: B
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### Section 2: OSI and TCP/IP Models
25. How many layers are in the TCP/IP model?
- A) 5
- B) 7
- C) 4
- D) 6
Answer: C
26. What layer of the TCP/IP model corresponds to the OSI's application layer?
- A) Network Layer
- B) Internet Layer
- C) Application Layer
- D) Physical Layer
Answer: C
27. The data link layer is responsible for:
- A) IP addressing
- B) Physical transmission
- C) MAC addressing
- D) Transport control
Answer: C
28. Which layer in OSI is responsible for data formatting and encryption?
- A) Presentation Layer
- B) Application Layer
- C) Transport Layer
- D) Network Layer
Answer: A
29. Which protocol provides reliable data transmission?
- A) UDP
- B) IP
- C) TCP
- D) FTP
Answer: C
30. The network layer is primarily responsible for:
- A) Data encapsulation
- B) Data routing
- C) Error detection
- D) Signal transmission
Answer: B
31. The session layer handles:
- A) Data synchronization
- B) Data routing
- C) MAC addresses
- D) Packet switching
Answer: A
32. The OSI model was created by:
- A) IEEE
- B) IETF
- C) ISO
- D) W3C
Answer: C
33. HTTP operates at which layer in the OSI model?
- A) Application Layer
- B) Transport Layer
- C) Network Layer
- D) Data Link Layer
Answer: A
34. What kind of data does the physical layer work with?
- A) Signals
- B) Frames
- C) Packets
- D) Segments
Answer: A
35. The OSI model’s data link layer prepares data for:
- A) Physical transmission
- B) Application processing
- C) Packet routing
- D) File sharing
Answer: A
36. IP operates in which OSI layer?
- A) Transport Layer
- B) Network Layer
- C) Application Layer
- D) Data Link Layer
Answer: B
37. FTP is typically used for:
- A) File transfers
- B) Web browsing
- C) Email
- D) Database access
Answer: A
38. The application layer is the __ layer in the OSI model.
- A) First
- B) Last
- C) Third
- D) Fifth
Answer: B
39. The OSI model’s network layer handles:
- A) Data routing
- B) File transfers
- C) Application logic
- D) Error detection
Answer: A
40. A switch operates at which OSI layer?
- A) Data Link Layer
- B) Network Layer
- C) Physical Layer
- D) Transport Layer
Answer: A
41. The presentation layer is part of which model?
- A) TCP/IP
- B) OSI
- C) HTTP
- D) DNS
Answer: B
42. The OSI model’s session layer is responsible for:
- A) Maintaining sessions
- B) Data framing
- C) Signal conversion
- D) Routing
Answer: A
43. Which layer does error detection and correction in OSI?
- A) Data Link Layer
- B) Transport Layer
- C) Physical Layer
- D) Network Layer
Answer: A
44. The OSI physical layer deals with:
- A) Hardware and cables
- B) Packet routing
- C) Application management
- D) Encryption
Answer: A
