HPE7-A08 · Question #48
You have configured UBT on your CX switches, but now HTTPS-enabled websites will not load, which you suspect is due to the packet size. To resolve the issue, what should you configure on each device…
The correct answer is A. Path MTU discovery. When using UBT (User-Based Tunneling), packets are encapsulated, which increases their size. HTTPS traffic is sensitive to MTU issues -- if packets exceed the path MTU and PMTUD is not functioning, sessions break or stall. To prevent this, Path MTU Discovery must be enabled…
Question
You have configured UBT on your CX switches, but now HTTPS-enabled websites will not load, which you suspect is due to the packet size. To resolve the issue, what should you configure on each device with funneled traffic?
Exhibit
Options
- APath MTU discovery
- BFragment reassembly
- CJumbo frames
- DIP fragmentation
How the community answered
(57 responses)- A47% (27)
- B30% (17)
- C7% (4)
- D16% (9)
Explanation
When using UBT (User-Based Tunneling), packets are encapsulated, which increases their size. HTTPS traffic is sensitive to MTU issues -- if packets exceed the path MTU and PMTUD is not functioning, sessions break or stall. To prevent this, Path MTU Discovery must be enabled, ensuring devices automatically determine the correct MTU and avoid fragmentation-related issues. Jumbo frames or manual fragmentation do not solve the underlying PMTU mismatch, and fragmentation is generally avoided for tunneled traffic.
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