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Objective 2.4

200-301

Configure and verify (Layer 2/Layer 3) EtherChannel (LACP).

Objective 2.4 sits in Network Access, which carries 20% of the CCNA exam. The questions below are original, written from the official objective title above, and each explanation cites the Cisco page it rests on.

Objective title verbatim from the official objectives. Cisco exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

2-4Network Access

Both switches carry the same uplink configuration and the bundle never comes up.

SW1# show etherchannel summaryFlags:  D - down        P - bundled in port-channel        I - stand-alone s - suspended        H - Hot-standby (LACP only)        R - Layer3      S - Layer2        U - in use      f - failed to allocate aggregator Number of channel-groups in use: 1Number of aggregators:           1 Group  Port-channel  Protocol    Ports------+-------------+-----------+-------------------------------------1      Po1(SD)       LACP        Gi1/0/1(I)  Gi1/0/2(I) SW1# show running-config interface gigabitethernet1/0/1interface GigabitEthernet1/0/1 switchport mode trunk channel-group 1 mode passive

What is stopping the bundle?

Neither end opens LACP negotiation in passive modeCorrect · your answerCorrect. Two responders leave nobody to send the first control frame.
Trunk mode blocks LACP frames on the member portsControl frames ride the lowest numbered VLAN on a trunk and are unaffected by trunking. Trunk members bundle routinely.
The port-channel interface was never created by handA channel group command creates the logical interface on its own for Layer 2 ports, and the summary already lists Po1.
LACP wants matching port priorities on the two portsPort priority selects which members bundle when there are more candidates than slots. It is not a condition of forming the channel.

Correct.

Checked against cisco.com, August 2026

Concept

Aggregation negotiation has an initiating role and a responding role. A responder answers control frames it is sent and never sends the first one, so two responders facing each other exchange nothing and each port stays an ordinary link.

Why A

The summary marks both members stand-alone and the channel down, and the interface carries the responding keyword on a peer configured the same way. Switching one side to active gives the pair an initiator, and both members then move to bundled.

Source

A port in the passive mode cannot form an EtherChannel with another port that is also in the passive mode because neither port starts LACP negotiation.

Cisco: Configuring EtherChannels (Catalyst 9300, IOS XE 17.3.x), checked August 2026
#etherchannel#lacp#show-etherchannel-summary

Now you: objective 2.4 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

2-4Network Access

Two trunk ports assigned to channel group 2 stay stand-alone, and both sides are set to the initiating LACP mode.

SW1# show etherchannel summaryFlags:  D - down        P - bundled in port-channel        I - stand-alone s - suspended        R - Layer3      S - Layer2        U - in use Group  Port-channel  Protocol    Ports------+-------------+-----------+-------------------------------------2      Po2(SD)       LACP        Gi1/0/3(I)  Gi1/0/4(I) SW1# show running-config interface gigabitethernet1/0/3interface GigabitEthernet1/0/3 switchport mode trunk switchport trunk allowed vlan 1,10,20 channel-group 2 mode active SW1# show running-config interface gigabitethernet1/0/4interface GigabitEthernet1/0/4 switchport mode trunk switchport trunk allowed vlan 1,10,20,30 channel-group 2 mode active

What keeps them apart?

Sample question 2 of 3

2-4Network Access

A routed EtherChannel between two switches passes no traffic, and the neighbor cannot ping across it.

SW1# show running-config interface port-channel 5interface Port-channel5 no switchport no ip address SW1# show running-config interface gigabitethernet1/0/1interface GigabitEthernet1/0/1 no switchport ip address 10.1.1.1 255.255.255.252 channel-group 5 mode active

What has to be corrected?

Sample question 3 of 3

2-4Network Access

Two servers are joined through a two member 1 Gbps aggregated link. A single large file copy between them never passes 1 Gbps, although both members are up. Why?

That’s 3 of the full CCNA bank.

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

More objectives in Network Access