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








 

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

This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate





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