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Exam 200-301 topic 1 question 279 discussion

Actual exam question from Cisco's 200-301

Question #: 279
Topic #: 1

Refer to the exhibit. An engineer is configuring a Layer 3 port-channel interface with LACP. The configuration on the first device is complete, and it is verified that both interfaces have registered the neighbor device in the CDP table. Which task on the neighbor device enables the new port channel to come up without negotiating the channel?

A. Configure the IP address of the neighboring device.
B. Bring up the neighboring interfaces using the no shutdown command.
C. Change the EtherChannel mode on the neighboring interfaces to auto.
D. Modify the static EtherChannel configuration of the device to passive mode.

Show Suggested Answer

Suggested Answer: D 🗳️

by splashy at Sept. 11, 2022, 6:18 p.m.

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splashy

Highly Voted 2 years, 3 months ago

Yes... it's D But it's also a bad answer as per cisco documentation (current netacad course) static/manual = etherchannel ON dynamic/negotiation = LACP PagP So they provide an answer with a partially incorrect statement to confuse you and look at an other option with an even worse or incorrect statement... .

upvoted 18 times

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jeremykebir

Highly Voted 1 year ago

Guys you have to pay attention when you're reading They say "Which task on the neighbor device enables the new port channel to come up without negotiating the channel?" This is the neighbor devices that must not negotiate, so this D = Passive Mode Good answer : D

upvoted 7 times

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dsmitd33

Most Recent 1 month, 1 week ago

Selected Answer: D

D is the best answer but still wrong. The wording is a little too convoluted. An Active and Passive configuration results in a negotiation taking place. The exact wording saying the Passive interface doesn’t negotiate when that shouldn’t matter since a negotiation still happens makes this question once again ridiculous.

upvoted 1 times

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TT2215

3 months ago

Selected Answer: B

Regardless of whether the neighbor device is active or passive, the channel should come up, but the interfaces status is down, so Option B

upvoted 1 times

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riteshm42

4 months, 1 week ago

Selected Answer: B

Option B[Bring up the neighboring interfaces using the no shutdown command.] is correct, because it has been specifically asked that channel should come up without negotiating and they have also mentioned that both devices are configured with portchannel.

upvoted 2 times

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[Removed]

9 months, 1 week ago

Selected Answer: D

D is correct

upvoted 1 times

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a67c04a

10 months, 2 weeks ago

Selected Answer: D

it´s D

upvoted 3 times

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Andu93

11 months, 2 weeks ago

Selected Answer: D

The LACP protocol defines two modes: LACP active: This LACP mode places a port in an active negotiating state. In this state, the port initiates negotiations with other ports by sending LACP packets. LACP passive: This LACP mode places a port in a passive negotiating state. In this state, the port responds to the LACP packets that it receives but it does not initiate LACP packet negotiation. The passive mode is useful when you do not know whether the remote system supports LACP.

upvoted 6 times

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AbdullahMohammad251

1 year, 1 month ago

Selected Answer: D

The interfaces of the switch are UP by default so we don't need the (no shutdown) command.(Tested in Packet tracer) The on mode forces a port to join an EtherChannel without negotiations. Passive places a port into a passive negotiating state in which the port responds to LACP packets that it receives, but does not start LACP packet negotiation. It should be On but Passive is the closest to the right answer. https://learningnetwork.cisco.com/s/question/0D53i00000KsyD3CAJ/when-is-interface-shutdown https://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3.2_0_se/multibook/configuration_guide/b_consolidated_config_guide_3850_chapter_0111110.pdf

upvoted 2 times

AbdullahMohammad251

12 months ago

A is incorrect because to successfully register a device in the CDP neighboring table, it has to be in the same subnet of my device and this means that the neighboring device is configured with a valid IP address. B is incorrect, interfaces of the switch are UP by default so we don't need the (no shutdown) command; tested in packet tracer. C is incorrect, Auto mode is used in PAGP not LACP. * Correction * With the on mode, a usable EtherChannel exists only when both ends of the link are configured in the on mode. https://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/trash/swethchl.html#:~:text=With%20the%20on%20mode%2C%20a,such%20as%20speed%20and%20duplex. D is correct

upvoted 1 times

AbdullahMohammad251

12 months ago

* correction * for option B, CDP is a layer 2 protocol, so we don't even need to set up the IPs. The neighbors just need to be directly connected.

upvoted 2 times

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NewJeans

1 year, 2 months ago

Selected Answer: D

should be passive

upvoted 2 times

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rozekjablkowy

1 year, 2 months ago

Selected Answer: B

B the best answer

upvoted 2 times

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Gene_nstudy

1 year, 3 months ago

This Layer 3 Port-channel configuration is WRONG!! To configure Layer 3 port-channel, the no switchport command is required on the physical interface and the Port-channel interface. Cisco should do more reviews of the exam questions!

upvoted 2 times

JamesCCNA

1 year, 1 month ago

Command not necessary on routers

upvoted 1 times

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Yinxs

1 year, 4 months ago

Selected Answer: D

The focus of this question is how to communicate with neighbor to make a LACP l3 channel. So active <---> passive can make this goal.

upvoted 2 times

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raptuz

1 year, 4 months ago

Selected Answer: B

Is missing some config. For create a L3 port-channel is it necessary to no switchport for the interfaces that will be member of port-channel, this operation admin shutdown the interfaces. The question is to come up without negotiating the channel, so is it necessary to bring up the neighbors interfaces.

upvoted 4 times

newyorkkam22

1 year, 1 month ago

I agree. You have to do a "no shutdown" before you start the initial configuration. After you assign the IP address, you have to do a "no shutdown'" to bring it back up.

upvoted 2 times

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FALARASTA

1 year, 8 months ago

But the passive mode will call for negotiation from the active mode. The answer is partially wrong but the best choice anyway

upvoted 3 times

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Murphy2022

2 years, 2 months ago

Which task on the neighbor device enables the new port channel to come up without negotiating the channel? As the neighboring device isn't negotiating its LACP Channel in passive mode, D is correct. The negatiation is done by the active configuration. Passive only accepts, but doesn't negotiate.

upvoted 3 times

RougePotatoe

2 years, 1 month ago

Based on this cisco resource you are wrong. The right answer should be manually configure it to On as passive still participate in negotiation. Since that option is not here the closest right answer is D. "Both the active and passive LACP modes enable ports to negotiate with partner ports to an EtherChannel based on criteria such as port speed, and for Layer 2 EtherChannels, based on trunk state and VLAN numbers." https://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3.2_0_se/multibook/configuration_guide/b_consolidated_config_guide_3850_chapter_0111110.pdf

upvoted 3 times

FALARASTA

1 year, 8 months ago

From that document: Both theactiveandpassiveLACPmodes enable ports to negotiatewith partnerports to an EtherChannelbasedoncriteriasuchasportspeed,andforLayer2EtherChannels,basedontrunkstateandVLANnumbers.PortscanformanEtherChannelwhentheyareindifferentLACPmodesaslongasthemodesarecompatible.For example:•A port in theactivemode can form an EtherChannelwith anotherport that is in theactiveorpassivemode.•A port in thepassivemode cannotform an EtherChannelwith anotherport that is also in thepassivemode becauseneitherport starts LACP negotiation. I support

upvoted 1 times

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harsh1309

1 year, 10 months ago

Yes RougePotatoe is correct, passive doesn't cause port to not negotiate, instead port wait for other switch to start negotiation and then they start negotiation.

upvoted 1 times

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purenuker

2 years, 1 month ago

Does "active" and "on" form an etherchannel ? I don't think so.

upvoted 3 times

RougePotatoe

2 years, 1 month ago

Think you might be right. I've seen a chart a while back that stated it does but I've never checked it. I just did it in packet tracer and in the Active/ON configuration results in the LACP side to have po1 as connected while the ON switch has po1 as not connected. The LACP switch has 1 of the links protocol down as well.

upvoted 1 times

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