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Question 230
A four-member EtherChannel is already formed as Port-channel5. The operator wants to inspect settings on the **logical** aggregate interface instead of one physical member. Which interface context should be examined?
- Inspect only GigabitEthernet1/0/1 without entering Port-channel5 context
- Inspect show interfaces trunk without identifying Port-channel5
- Change LACP mode to active on all members without inspecting the formed aggregate
- Inspect interface port-channel 5
Explanation
Correct Answer
D:Port-channel represents the logical link over the configured physical members.
Incorrect Answers
A:A physical member interface cannot represent the complete logical aggregate’s configured IP or trunk properties.
B:A trunk summary may list VLAN carriage but is not the requested logical aggregate interface configuration context.
C:Negotiation mode change is disruptive and does not satisfy the read-only inspection request for Port-channel5.
Question 231
Two Catalyst ports form an LACP bundle but one has a different native VLAN/allowed set from the other. Which member-level trunk property comparison helps restore a consistent bundle?
- Match only each member’s configured IP next hop without comparing switchport VLAN parameters
- Enable PortFast individually on physical members to bypass aggregation checks
- Check only LACP neighbor system IDs and ignore member switchport configuration
- Compare trunk and native VLAN settings of all members
Explanation
Correct Answer
D:Incompatible switchport properties prevent safe bundling of physical interfaces.
Incorrect Answers
A:This is a Layer 2 trunk bundle; inconsistent trunk/native settings are the reported compatibility issue.
B:PortFast does not correct inconsistent trunk VLAN characteristics for members of one EtherChannel.
C:Negotiation partners can be correct while incompatible local native/allowed VLAN settings exclude a member.
Question 232
Two candidate physical interfaces have different fixed speeds or mismatched duplex support and fail to join the intended EtherChannel. Which compatibility parameters must match for aggregation?
- Assign all ports to the same VLAN but leave one at an incompatible physical rate
- Verify matching speed and duplex capabilities
- Adjust switchport trunk allowed VLANs without checking physical layer negotiation
- Change LACP port priority to force incompatible-rate interfaces to join
Explanation
Correct Answer
B:EtherChannel requires compatible physical port characteristics.
Incorrect Answers
A:Matching VLANs does not reconcile mismatched speed or duplex on links intended for the same bundle.
C:Trunk permission changes cannot make incompatible Ethernet PHY modes operate as one bundle.
D:Priority influences port selection but cannot override physical compatibility requirements for aggregation.
Question 233
A switch has LACP enabled but the port-channel remains down. The operator needs evidence of the adjacent system IDs, partner ports and negotiation state. Which LACP neighbor display should be used?
- Inspect show interfaces trunk to read allowed VLANs
- Inspect show lacp neighbor
- Inspect show mac address-table dynamic on the aggregated VLAN
- Run show spanning-tree port-channel to read the STP role
Explanation
Correct Answer
B:LACP neighbor output confirms which partner ports and systems are participating.
Incorrect Answers
A:The trunk listing does not enumerate LACP partner system IDs, peer ports and negotiation state.
C:MAC learning is unrelated to LACP negotiation partner identity requested.
D:STP treats the bundle as a logical link but does not report the LACP partner system and port details.
Question 234
A Catalyst switch has a healthy four-link EtherChannel, but most application traffic uses one physical member. The operator needs to see which header fields the switch uses to select member links; it does not want to recheck member status. Which command is appropriate when supported by the platform?
- show etherchannel load-balance
- show etherchannel summary
- show lacp neighbor
- show interfaces status
Explanation
Correct Answer
A:This command displays the switch’s EtherChannel load-distribution selection policy, such as source/destination address or port fields as supported.
Incorrect Answers
B:The summary shows channel/member state, not the hash inputs used to choose the forwarding link.
C:LACP neighbor information addresses negotiation peers, not the global/per-platform EtherChannel load-balance selection mechanism.
D:Interface status can show link speeds and state but does not reveal the EtherChannel hashing policy.
Question 235
Four member links participate in one Port-channel trunk, and a new allowed VLAN must be carried consistently by the aggregate. Where should the shared logical interface setting be applied rather than drifting per member?
- Place conflicting switchport trunk VLAN lists independently on each physical member
- Configure an access VLAN only on one member to carry three tagged VLANs
- Apply consistent settings to the port-channel interface
- Configure the new VLAN solely as a routed loopback on the switch
Explanation
Correct Answer
C:Configuring the logical bundle and compatible members helps maintain coherent forwarding.
Incorrect Answers
A:Member disagreement can cause bundle suspension or unexpected behavior, rather than applying the uniform logical aggregate policy.
B:One access VLAN cannot represent the required multi-VLAN trunk behavior on the entire bundle.
D:A loopback address does not add VLAN carriage to the L2 Port-channel trunk.
Question 236
An operator is building a routed Port-channel between two Layer 3 switches rather than a Layer 2 VLAN trunk. Which routed-interface conversion must be supported and applied consistently to the physical member ports?
- Configure only an IP address on the physical member while leaving it as an L2 switchport
- Apply no switchport to the routed member links
- Use switchport mode trunk on every member and treat the bundle as routed
- Set switchport access vlan 1 on each member while expecting Layer 3 routing
Explanation
Correct Answer
B:A routed EtherChannel uses Layer 3 physical interfaces compatible with the Layer 3 port-channel.
Incorrect Answers
A:A Layer 3 port-channel requires compatible routed members; per-member IP addresses are not the correct aggregate IP setting.
C:A Layer 2 trunk carries tagged Ethernet VLANs; it does not implement the specified routed aggregate.
D:An access member is still a switched link and does not give the required routed member status.
Question 237
A Cisco Catalyst uplink must bundle Ethernet member links with a standards-compliant third-party switch that supports IEEE link aggregation but not Cisco PAgP. Which negotiated EtherChannel protocol should both ends use?
- PAgP desirable on Cisco and LACP passive on the third-party switch
- Static `mode on` at one end and PAgP auto at the other end
- LACP on both peers, with at least one active mode and compatible member attributes
- HSRP active/standby between the two switchport members
Explanation
Correct Answer
C:LACP supports standards-based link aggregation across vendors, and compatible active/active or active/passive peers can negotiate the bundle.
Incorrect Answers
A:PAgP is Cisco-proprietary; a third-party device supporting standards-based LACP will not form the intended common PAgP/LACP negotiation.
B:A forced nonnegotiating member at one end is not the same protocol as a partner expecting PAgP negotiation.
D:HSRP is first-hop IP gateway redundancy and does not negotiate a Layer 2 EtherChannel of physical switchports.
Question 238
An EtherChannel is designed as a Layer 3 IP link. Which IOS interface should own its one logical IP address after the physical member links are bundled?
- Assign the same IPv4 address to each physical member interface
- Configure the address under interface port-channel
- Assign the IP gateway to SVI VLAN 1 and leave the routed bundle without an address
- Put the IP address under the LACP neighbor system identifier field
Explanation
Correct Answer
B:The logical Layer 3 port-channel carries the routed address rather than separate member interfaces.
Incorrect Answers
A:The routed Port-channel is one Layer 3 interface; assigning identical IPs to individual members is not the model.
C:An unrelated SVI is a different logical interface and does not number the requested routed Port-channel.
D:LACP identity identifies aggregation peers; it is not an IP address configuration context.
Question 239
A configured routed Port-channel is not forwarding. The technician needs an IPv4 interface status/summary showing the Port-channel address and line state. Which show command fits?
- Run show lacp neighbor to view peer system IDs only
- Run show etherchannel summary to list bundled members only
- Run show interfaces trunk for VLAN allowed lists
- Inspect show ip interface brief for the Port-channel
Explanation
Correct Answer
D:The IPv4 interface summary shows its configured address and operational line status.
Incorrect Answers
A:LACP neighbor state does not include the logical Port-channel’s IPv4 address and operational line status.
B:That shows bundle membership but not the requested IPv4 address of the routed Port-channel.
C:A routed Port-channel is not a Layer 2 VLAN trunk, and this output does not show its assigned IPv4 address.
Question 240
An EtherChannel member has a larger MTU than another member, and the bundle rejects inconsistent ports. Which member-level parameter must be aligned before traffic is balanced?
- Increase LACP system priority and ignore physical MTU incompatibility
- Align interface MTU settings across the bundle
- Configure different jumbo MTUs on each member to spread packet sizes
- Change only the EtherChannel load-balance hash
Explanation
Correct Answer
B:Member consistency prevents incompatible links from being included.
Incorrect Answers
A:LACP election/priority cannot correct data-plane MTU incompatibility among members.
C:A bundle needs compatible member attributes; making MTUs deliberately unequal does not remove inconsistency.
D:Hash selection distributes flows but does not change physical interface MTUs or repair member compatibility.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests