The correct answer is to configure the channel-group mode on the member interfaces. Without this mode—such as channel-group 1 mode active or passive—the physical interfaces remain independent links, preventing them from being bundled into a single logical port-channel interface. OSPF requires this logical bundle to treat the aggregated link as one adjacency; without it, each interface would attempt separate neighbor relationships, breaking the intended OSPF adjacency. On the Cisco DCCOR 350-601 exam, this concept tests your understanding of the fundamental prerequisite for any Layer 3 port-channel: the channel-group mode must be set before OSPF can form an adjacency over the logical interface. A common trap is assuming that creating the port-channel interface alone is sufficient—candidates often forget that the member interfaces themselves need explicit mode configuration. Remember the mnemonic: “No mode, no bundle; no bundle, no adjacency.”
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
interface Port-channel10
no switchport
ip address 10.1.1.1/30
ip ospf network point-to-point
Refer to the exhibit. A network engineer has configured a port-channel for OSPF adjacency. What additional configuration is required for the port-channel to operate correctly?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the channel-group mode on member interfaces.
Option D is correct because for a port-channel to form an OSPF adjacency, the member interfaces must be configured with a channel-group mode (e.g., 'channel-group 1 mode active') to bundle them into a logical port-channel interface. Without this, the interfaces remain individual Layer 2 or Layer 3 links, and OSPF cannot establish adjacency over the port-channel as a single logical link.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Set the OSPF priority.
Why it's wrong here
Priority is optional and does not affect basic functionality.
✗
No additional configuration needed.
Why it's wrong here
Member interfaces are missing; port-channel is essentially empty.
✗
Enable OSPF on the port-channel with `ip router ospf process`.
Why it's wrong here
OSPF is enabled on the interface once the network command covers it.
✓
Configure the channel-group mode on member interfaces.
Why this is correct
Member interfaces must be assigned to the port-channel using `channel-group`.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that creating the port-channel interface alone is sufficient, when in fact the member interfaces must be explicitly assigned to the port-channel using the channel-group command.
Trap categories for this question
Command / output trap
OSPF is enabled on the interface once the network command covers it.
Detailed technical explanation
How to think about this question
Under the hood, a port-channel aggregates multiple physical links into a single logical interface using the IEEE 802.3ad Link Aggregation Control Protocol (LACP) or Cisco's PAgP. OSPF treats the port-channel as a single interface, so all member links must be in the same channel-group and mode (active/passive/on) to avoid spanning-tree blocking or inconsistent forwarding. In real-world scenarios, forgetting to configure the channel-group mode on member interfaces is a common misconfiguration that leaves the port-channel in a down state, preventing OSPF adjacency from forming.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the channel-group mode on member interfaces. — Option D is correct because for a port-channel to form an OSPF adjacency, the member interfaces must be configured with a channel-group mode (e.g., 'channel-group 1 mode active') to bundle them into a logical port-channel interface. Without this, the interfaces remain individual Layer 2 or Layer 3 links, and OSPF cannot establish adjacency over the port-channel as a single logical link.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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