| Exam 300-115 | Question id=1379 | Layer 2 Technologies |
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 |
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.