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Exam 300-115 All Questions

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Exam 300-115 topic 1 question 78 discussion

Actual exam question from Cisco's 300-115
Question #: 78
Topic #: 1
[All 300-115 Questions]

What is required for a LAN switch to support 802.1q Q-in-Q encapsulation?

  • A. Support less than 1500 MTU
  • B. Support 1504 MTU or higher
  • C. Support 1522 layer 3 IP and IPX packet
  • D. Support 1547 MTU only
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Suggested Answer: B 🗳️
The default system MTU for traffic on Catalyst switches is 1500 bytes. Because the 802.1Q tunneling (Q-in-Q) feature increases the frame size by 4 bytes when the extra tag is added, you must configure all switches in the service-provider network to be able to process maximum frames by increasing the switch system
MTU size to at least 1504 bytes.
Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_13_ea1/configuration/guide/swtunnel.html
by [deleted] at April 3, 2025, 6:26 p.m.

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