CN computer networks part 2

26. Bridges operate at which OSI layer?

Options:

(A) Physical

(B) Data Link

(C) Network

(D) Transport

✅ Correct Answer: (B) Data Link

27. Network devices are often:

Options:

(A) Hardware-only

(B) Passive

(C) Software-defined

(D) Analog

✅ Correct Answer: (C) Software-defined

28. TCP/IP model consists of how many layers?

Options:

(A) 2

(B) 3

(C) 5

(D) 4

✅ Correct Answer: (D) 4

29. HTTP belongs to which TCP/IP layer?

Options:

(A) Transport

(B) Application

(C) Internet

(D) Network Interface

✅ Correct Answer: (B) Application

30. Which protocol is connection-oriented?

Options:

(A) UDP

(B) IP

(C) TCP

(D) ARP

✅ Correct Answer: (C) TCP

31. SMTP is best used for:

Options:

(A) File transfer

(B) Email

(C) Real-time streaming

(D) Web browsing

✅ Correct Answer: (B) Email

32. ICMP is mainly used for:

Options:

(A) Encryption

(B) Error reporting

(C) Address assignment

(D) MAC to IP

✅ Correct Answer: (B) Error reporting

33. ARP maps:

Options:

(A) IP to MAC

(B) MAC to IP

(C) Internet to Domain

(D) Domain to IP

✅ Correct Answer: (A) IP to MAC

34. Internet between autonomous systems uses:

Options:

(A) RIP

(B) OSPF

(C) BGP

(D) EIGRP

✅ Correct Answer: (C) BGP

35. TCP congestion control improves:

Options:

(A) Packet size

(B) Network efficiency

(C) Address space

(D) Encryption

✅ Correct Answer: (B) Network efficiency

36. TCP/IP architecture is:

Options:

(A) Centralized

(B) Layer-strict

(C) Decentralized

(D) Hardware-dependent

✅ Correct Answer: (C) Decentralized

37. IPv4 corresponds to which OSI layer?

Options:

(A) Transport

(B) Data Link

(C) Network

(D) Physical

✅ Correct Answer: (C) Network

38. TTL field prevents:

Options:

(A) Fragmentation

(B) Encryption

(C) Infinite routing loops

(D) Encryption errors

✅ Correct Answer: (C) Infinite routing loops

39. IPv4 header size ranges between:

Options:

(A) 10–20 bytes

(B) 20–60 bytes

(C) 40–80 bytes

(D) Fixed 32 bytes

✅ Correct Answer: (B) 20–60 bytes

40. Fragment offset is used for:

Options:

(A) Error checking

(B) Reassembly

(C) Routing

(D) Address translation

✅ Correct Answer: (B) Reassembly

41. Protocol field identifies:

Options:

(A) Source host

(B) Destination host

(C) Encapsulated transport protocol

(D) Fragment size

✅ Correct Answer: (C) Encapsulated transport protocol

42. IPv4 checksum covers:

Options:

(A) Payload only

(B) Header only

(C) Entire packet

(D) Source address only

✅ Correct Answer: (B) Header only

43. Identification field is used during:

Options:

(A) Routing

(B) Fragmentation

(C) Encryption

(D) Addressing

✅ Correct Answer: (B) Fragmentation

44. IPv4 provides:

Options:

(A) Guaranteed delivery

(B) Best-effort delivery

(C) Encrypted delivery

(D) Error-free delivery

✅ Correct Answer: (B) Best-effort delivery

45. Which is NOT an IPv4 limitation?

Options:

(A) Small address space

(B) No built-in security

(C) Large header size

(D) Fragmentation overhead

✅ Correct Answer: (C) Large header size

46. IPv4 address length is:

Options:

(A) 16 bits

(B) 32 bits

(C) 64 bits

(D) 128 bits

✅ Correct Answer: (B) 32 bits

47. CIDR stands for:

Options:

(A) Classless IP Data Routing

(B) Classless Inter-Domain Routing

(C) Common Internal Data Routing

(D) Classless Internal Data Routing

✅ Correct Answer: (B) Classless Inter-Domain Routing

48. Class C address range is:

Options:

(A) 1–126

(B) 128–191

(C) 192–223

(D) 224–239

✅ Correct Answer: (C) 192–223

49. NAT mainly improves:

Options:

(A) Bandwidth

(B) Address efficiency

(C) Encryption

(D) Latency

✅ Correct Answer: (B) Address efficiency

50. NAT is used to:

Options:

(A) Increase speed

(B) Encrypt traffic

(C) Translate private to public IPs

(D) Assign MAC addresses

✅ Correct Answer: (C) Translate private to public IPs

Anic_an_engineer

Author & Editor

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