Answers:
1. An Etherchannel is simply the logical bundling of physical trunk connections; this allows the use of all trunks rather than just one.
2. Four of the six ports will be in Forwarding mode - one on the non-root and all three on the root.
3. "A". Out of those four actions, the only one that will happen is the increase in the port channel.
4. You can put up to eight trunks into a single Etherchannel.
5. "B". If you don't see anything in the output of that command, something's wrong with your config. You should see the port-channel appear where you previously would have seen the individual trunks.
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6. To enable Inverse ARP, you need only enable Frame Relay on the interface and then open it - it's enabled by default when you do those two things.
7. no frame-relay inverse arp
8. "D". That frame map statement could carry unicasts, such as pings to 172.1.1.2, but without the broadcast option on the end, broadcasts and multicasts will not be carried.
9. On that serial interface, run the frame-relay lmi-type ansi command.
10. "C". The DE, BECN, and FECN values help the frame devices detect congestion and determine how to react to that congestion. The CIR was discussed earlier in this exam. It's an important value but is not a congestion notification value.
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