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Exam 350-401 topic 1 question 107 discussion

Actual exam question from Cisco's 350-401

Question #: 107
Topic #: 1

Refer to the exhibit.

A port channel is configured between SW2 and SW3. SW2 is not running a Cisco operating system. When all physical connections are made, the port channel does not establish.
Based on the configuration excerpt of SW3, what is the cause of the problem?

A. The port-channel mode should be set to auto.
B. The port channel on SW2 is using an incompatible protocol.
C. The port-channel trunk is not allowing the native VLAN.
D. The port-channel interface load balance should be set to src-mac.

Show Suggested Answer

Suggested Answer: B 🗳️

by ABC123 at March 22, 2021, 3:30 a.m.

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Reavr

Highly Voted 3 years, 1 month ago

Answer is B. The question states that SW2 is not running Cisco. Therefore it cannot run PaGP (which according to the snippet, SW3 is configured as). So it has to be changed to either channel-group active or passive to do LACP.

upvoted 12 times

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PedroPicapiedra

Highly Voted 2 years, 1 month ago

Selected Answer: B

The correct is B *** PaGP - Cisco Propietary protocol Config modes: - Desirable - Auto - On *** LACP - Open Standard Protocol Config modes: - Active - Passive - On

upvoted 9 times

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[Removed]

Most Recent 6 months, 2 weeks ago

Selected Answer: B

B is correct

upvoted 1 times

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andy_doesnt_like_uucp

8 months, 2 weeks ago

it's a bit silly Q. LAG on the SW2 (not Cisco) wont accept PAGP configuration at all

upvoted 1 times

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slacker_at_work

10 months, 2 weeks ago

Selected Answer: B

Answer: B Desirable employs the PAgP protocol which is Cisco proprietary and SW2 is not running a Cisco OS.

upvoted 1 times

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nushadu

1 year, 11 months ago

Selected Answer: B

>SW2 is not running a Cisco operating system. PaGP is Cisco proprietary technology ...

upvoted 2 times

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Parot

2 years, 1 month ago

Answer is B. Desirable mode means PAGP - cisco proprietary protocol. LACP should be use to setup the link between Cisco and non -Cisco devices.

upvoted 1 times

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KZM

2 years, 3 months ago

PAGP is Cisco proprietary and LACP is an IEEE 802.3ad open standard protocol. Between Cisco IOS and non-Cisco devices, just support LACP for Link Aggregation. The command "Channel-group xx mode desirable" is used in PAGP. For the LACP configuration, the command should be "Active or Passive" in channel-group mode.

upvoted 1 times

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Multicast01005e

3 years, 1 month ago

B is absolutely correct

upvoted 3 times

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kthekillerc

3 years, 5 months ago

B is the correct answer

upvoted 3 times

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ABC123

3 years, 8 months ago

B is wrong. Answer should be A, as desirable is for Cisco Proprietary PAgP. S1(config)# interface range f0/13 -15 S1(config-if-range)# channel-group 1 mode ? active Enable LACP unconditionally auto Enable PAgP only if a PAgP device is detected desirable Enable PAgP unconditionally on Enable Etherchannel only passive Enable LACP only if a LACP device is detected From: https://packetlife.net/blog/2010/jan/18/etherchannel-considerations/

upvoted 1 times

mustache

3 years, 8 months ago

kindly check the exhibit and read the question carefully before answering! B is correct, wrong Protocol is being used, PAgP is cisco proprietary. LACP is open Standard

upvoted 11 times

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amgue

3 years, 7 months ago

The question asks for the source of the problem, A gives the solution not the source, the correct answer is B

upvoted 7 times

ArchBishop

2 years, 10 months ago

A is not a solution... Desirable/Auto => PAgP Active/Passive => LACP

upvoted 2 times

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muska04

3 years, 4 months ago

B is the Correct answer. Auto => PAgP, not supported on non-cisco equipment.

upvoted 4 times

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