Why is the MTU for a PPPoE DSL configuration reduced from 1500 bytes to 1492?

IT Questions BankCategory: CCNAWhy is the MTU for a PPPoE DSL configuration reduced from 1500 bytes to 1492?

Why is the MTU for a PPPoE DSL configuration reduced from 1500 bytes to 1492?

  • to establish a secure tunnel with less overhead
  • to enable CHAP authentication
  • to accommodate the PPPoE headers
  • to reduce congestion on the DSL link

Explanation: The default maximum data field of an Ethernet frame is 1500 bytes. However, in PPPoE the Ethernet frame payload includes a PPP frame which has also has a header. This reduces the available data MTU to 1492 bytes.

Exam with this question: CCNA 4 Chapter 3 Exam Answers
Exam with this question: CCNA 4 v6 Chapter 3: Check Your Understanding


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