Question:
Which of the following statements about IPv4 fragmentation is/are TRUE?
Which of the following statements about IPv4 fragmentation is/are TRUE?
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Fragmentation can occur at any router where the MTU is exceeded, but reassembly is always performed only at the destination.
Updated On: Jan 23, 2025
- The fragmentation of an IP datagram is performed only at the source of the datagram.
- The fragmentation of an IP datagram is performed at any IP router which finds that the size of the datagram to be transmitted exceeds the MTU.
- The reassembly of fragments is performed only at the destination of the datagram.
- The reassembly of fragments is performed at all intermediate routers along the path from the source to the destination.
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The Correct Option is B
Solution and Explanation
IPv4 fragmentation occurs when the size of a datagram exceeds the Maximum Transmission Unit (MTU) of a network link.
Option (A): Incorrect. Fragmentation can occur at any intermediate router along the path, not just at the source.
Option (B): Correct. Any IP router that encounters an MTU smaller than the datagram size performs fragmentation.
Option (C): Correct. Reassembly of fragments is performed only at the destination to reconstruct the original datagram.
Option (D): Incorrect. Intermediate routers do not reassemble fragments; they forward them as they are. Final Answer: \[ \boxed{\text{(B), (C)}} \]
Option (A): Incorrect. Fragmentation can occur at any intermediate router along the path, not just at the source.
Option (B): Correct. Any IP router that encounters an MTU smaller than the datagram size performs fragmentation.
Option (C): Correct. Reassembly of fragments is performed only at the destination to reconstruct the original datagram.
Option (D): Incorrect. Intermediate routers do not reassemble fragments; they forward them as they are. Final Answer: \[ \boxed{\text{(B), (C)}} \]
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