We can answer this by discarding incorrect answers we need to use an open standard IE LACP
The option "A" is discarded: PAgP configuration
The option "B" is discarded: manual configuration ("On" mode)
The option "C" is configuration that LACP uses.
The option "D" is configuration that LACP uses.
The option "E" is discarded: It is configuration of trunk mode, not Etherchannel
C and D correct.
If I may correct "E": there is "switchport" twice, which is an invalid command. You actually can do access/trunk config on an EtherChannel and why wouldn't you when using VLANs.
Otherwise, good statement!
Definitely start w/ C (as per open standard w/c is LACP - active)
Then, follow it w/ E (with a caveat)
About answer C; you can't issue "no switchport" on a port-channel interface. You do that under interface/interface range configuration, before you even create the channel group. So there are two more steps beforehand (first selecting the range of interfaces, then creating the channel group). And btw, this IP thing is only for L3 EtherChannel/LAG. L2 LAG does not require an IP.
Now regarding answer E (w/ a caveat); in PT version 8.2.2 0400, you can't immediately issue the "switchport mode trunk" (answer E) either. Not sure if this is the case w/ live equipment but, you would first have to issue the command "encapsulation dot1q". Only after that will you be able to issue " switchport mode trunk", which is a necessary step for a LAG.
Strangely enough, I tried the commands listed in this answer in my lab. It seems that if you issue the "no switchport" command from the port-channel configuration it just does not work. The "no switchport" command must be issued from the physical interfaces configuration for the channel group to form.
Discuss with ChatGPT and Google AI, final answer is B and C
* **Command B:** This command creates a channel-group with the number 10 and sets the mode to "on". This unconditionally forms the EtherChannel with the peer switch, without relying on negotiation.
* **Command C:** This command creates a port-channel with the number 10, disables the switchport interface, and assigns an IP address and subnet mask. This is necessary for Layer 3 EtherChannels, as they require a virtual IP address and subnet mask to function.
**Note:** While it is possible to use option A (auto mode) instead of option B (on mode), option B is a more deterministic configuration and is generally recommended for Layer 3 EtherChannels.
Since command B force the port to join etherchannel without any kind of negotiation, and since the question asks to enstablish a layer 3 etherchannel with an open standard protocol, B is wrong. Correct answers are D and E.
The correct answers are:
B. interface GigabitEthernet0/0/1 channel-group 10 mode on
C. interface port-channel 10 no switchport ip address 172.16.0.1 255.255.255.0
To establish a Layer 3 EtherChannel, you should configure the physical interface with "channel-group 10 mode on" to enable EtherChannel and the virtual interface with an IP address using the "ip address" command. I apologize for the confusion in my previous responses.
The "mode active" command is used for LACP (Link Aggregation Control Protocol) negotiation, which is typically used for Layer 2 EtherChannel configuration. In Layer 3 EtherChannel configurations, the "mode active" command is not used.
Option B is incorrect because it is not an open standard. We're specifically asked for an open-standard protocol, the correct choice would involve using mode active, which would indicate the use of LACP, an IEEE standard (802.3ad) protocol for link aggregation.
ChatGPT says,
The two command sequences that must be configured on a switch to establish a Layer 3 EtherChannel with an open-standard protocol are:
B. interface GigabitEthernet0/0/1 channel-group 10 mode on
D. interface GigabitEthernet0/0/1 channel-group 10 mode active
Option A (interface GigabitEthernet0/0/1 channel-group 10 mode auto) sets the interface to automatically negotiate the mode of the EtherChannel, which may not be desirable.
Option C (interface port-channel 10 no switchport ip address 172.16.0.1 255.255.255.0) configures a Layer 3 interface for the EtherChannel, but it does not establish the EtherChannel itself.
Option E (interface port-channel 10 switchport switchport mode trunk) configures the EtherChannel interface as a trunk, but it does not establish the EtherChannel itself.
I agree C and D are correct. The only way C would not be correct is the question asked for which "two command sequence." C has a 3 commands, interface port-channel 10 no switchport ip address 172.16.0.1 255.255.255.0. "interface port-channel 10" is one, "no switchport" is the second one, and "Ip address 172.16.0.1 255.255.255.0 is the third command in the sequence.
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