Question 2,058 of 2,152

NetFlow and Flexible NetFlow →hardMultiple ChoiceObjective-mapped

300-410 NetFlow and Flexible NetFlow Practice Question

This 300-410 practice question tests your understanding of netflow and flexible netflow. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.

An engineer configures Control Plane Policing (CoPP) on a router to protect the management plane. After applying the policy, the router becomes unreachable via SSH, but the console is still accessible. The engineer checks the CoPP policy and sees that SSH traffic is permitted. Which is the most likely explanation?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The class-map for SSH uses 'match protocol ssh' but the SSH server is configured on a non-default port, so the traffic is not matched and is dropped by the default class.
CoPP class-maps that match by protocol may not match non-standard ports. If the default class has a drop action, SSH traffic will be dropped.
B
The CoPP policy is applied in the input direction, but SSH traffic is generated by the router itself, so it is not affected by input policing.
Why wrong: CoPP applies to traffic destined to the router, including SSH. Input policing affects incoming packets, so it should match SSH traffic.
C
The CoPP policy uses 'rate-limit' in bps instead of pps, causing all traffic to be dropped due to a misconfiguration.
Why wrong: Rate-limit units (bps vs pps) affect the policing rate but do not cause all traffic to be dropped unless the rate is set to 0.
D
The CoPP policy has an explicit deny statement before the permit statement for SSH, so SSH traffic is denied.
Why wrong: This is a possible misconfiguration, but the scenario states that SSH traffic is permitted, so this is not the case.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The class-map for SSH uses 'match protocol ssh' but the SSH server is configured on a non-default port, so the traffic is not matched and is dropped by the default class.

CoPP policies have an implicit deny at the end. If the class-map for SSH does not match the traffic correctly (e.g., using the wrong protocol or port), SSH packets will fall through to the default class, which may have a deny action. Additionally, the default class behavior is to permit traffic if not explicitly configured, but if the default class is configured with a drop action, all unmatched traffic is dropped. A common edge case is when the class-map uses 'match protocol ssh' but the router uses a different port for SSH (e.g., port 2222), so the traffic is not matched and is dropped by the default class.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The class-map for SSH uses 'match protocol ssh' but the SSH server is configured on a non-default port, so the traffic is not matched and is dropped by the default class.
Why this is correct
CoPP class-maps that match by protocol may not match non-standard ports. If the default class has a drop action, SSH traffic will be dropped.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The CoPP policy is applied in the input direction, but SSH traffic is generated by the router itself, so it is not affected by input policing.
Why it's wrong here
CoPP applies to traffic destined to the router, including SSH. Input policing affects incoming packets, so it should match SSH traffic.
✗
The CoPP policy uses 'rate-limit' in bps instead of pps, causing all traffic to be dropped due to a misconfiguration.
Why it's wrong here
Rate-limit units (bps vs pps) affect the policing rate but do not cause all traffic to be dropped unless the rate is set to 0.
✗
The CoPP policy has an explicit deny statement before the permit statement for SSH, so SSH traffic is denied.
Why it's wrong here
This is a possible misconfiguration, but the scenario states that SSH traffic is permitted, so this is not the case.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Trap categories for this question

Scenario analysis trap
This is a possible misconfiguration, but the scenario states that SSH traffic is permitted, so this is not the case.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

Visual reference

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this 300-410 question test?

NetFlow and Flexible NetFlow — This question tests NetFlow and Flexible NetFlow — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The class-map for SSH uses 'match protocol ssh' but the SSH server is configured on a non-default port, so the traffic is not matched and is dropped by the default class. — CoPP policies have an implicit deny at the end. If the class-map for SSH does not match the traffic correctly (e.g., using the wrong protocol or port), SSH packets will fall through to the default class, which may have a deny action. Additionally, the default class behavior is to permit traffic if not explicitly configured, but if the default class is configured with a drop action, all unmatched traffic is dropped. A common edge case is when the class-map uses 'match protocol ssh' but the router uses a different port for SSH (e.g., port 2222), so the traffic is not matched and is dropped by the default class.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Standard ACLs match source addresses.

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