JN0-102 · Question #18
What are two ways that packet fragmentation is handled differently between IPv6 and IPv4? (Choose two.)
The correct answer is A. End hosts determine the path MTU for IPv6. C. Packet fragmentation occurs at intermediate nodes for IPv4. In IPv6, end hosts are solely responsible for determining the Path MTU and performing fragmentation if needed, whereas in IPv4, intermediate routers can also perform fragmentation. This design simplifies router processing in IPv6.
Question
What are two ways that packet fragmentation is handled differently between IPv6 and IPv4? (Choose two.)
Options
- AEnd hosts determine the path MTU for IPv6.
- BEnd hosts determine the path MTU for IPv4.
- CPacket fragmentation occurs at intermediate nodes for IPv4.
- DPacket fragmentation occurs at intermediate nodes for IPv6.
How the community answered
(53 responses)- A94% (50)
- B2% (1)
- D4% (2)
Why each option
In IPv6, end hosts are solely responsible for determining the Path MTU and performing fragmentation if needed, whereas in IPv4, intermediate routers can also perform fragmentation. This design simplifies router processing in IPv6.
For IPv6, fragmentation can only be performed by the sending host, which must determine the Path MTU using Path MTU Discovery to avoid fragmentation by intermediate routers.
While IPv4 hosts can fragment, intermediate nodes can also fragment IPv4 packets.
In IPv4, both end hosts and intermediate routers can fragment packets if the packet size exceeds the MTU of an outgoing interface.
Intermediate nodes (routers) do not fragment IPv6 packets; they drop any IPv6 packet exceeding the interface MTU and send an ICMPv6 "Packet Too Big" message back to the sender.
Concept tested: IPv4 vs IPv6 fragmentation
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/ipv6/ipv6-overview
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