Cisco 100-150 Exam - Topic 3 Question 2 Discussion

Actual exam question for Cisco's 100-150 exam

Question #: 2
Topic #: 3

A support technician examines the front panel of a Cisco switch and sees 4 Ethernet cables connected in the first four ports. Ports 1, 2, and 3 have a green

LED. Port 4 has a blinking green light.

What is the state of the Port 4?

ALink is up with cable malfunctions.

BLink is up and not stable.

CLink is up and active.

DLink is up and there is no activity.

Show Suggested Answer

Suggested Answer: C

On a Cisco switch, a port with a blinking green LED typically indicates that the port is up (active) and is currently transmitting or receiving data. This is a normal state indicating active traffic on the port.

* A. Link is up with cable malfunctions: Usually indicated by an amber or blinking amber light.

* B. Link is up and not stable: Not typically indicated by a green blinking light.

* D. Link is up and there is no activity: Would be indicated by a solid green light without blinking.

Thus, the correct answer is C. Link is up and active.

* Cisco Switch LED Indicators

* Cisco Ethernet Switch LED Patterns

by Hubert at May 06, 2026, 02:17 AM

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Luis

3 days ago

Agreed, B seems right. Link is up but not stable.

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Glenna

8 days ago

I think Port 4 is unstable. Blinking light means issues.

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Wilburn

13 days ago

B is the best choice. It's active but not reliable.

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Cordell

19 days ago

D doesn't fit. There's definitely activity with that blinking light.

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Earlean

24 days ago

No way, C is too optimistic. Blinking means something's off.

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Hector

29 days ago

I feel like it could be A too. Malfunctions can cause blinking.

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Daisy

1 month ago

Agreed, B seems right. Link is up but not stable.

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Luisa

1 month ago

I think Port 4 is unstable. Blinking light means issues.

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Lisbeth

1 month ago

I disagree, it could be a sign of a malfunction.

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Laurel

2 months ago

I'm surprised it's not just a cable issue.

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Goldie

2 months ago

Blinking green usually means there's some activity.

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Edda

2 months ago

I think it's active but with issues.

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Herschel

2 months ago

Port 4 is definitely not stable.

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Catarina

2 months ago

I feel like I’ve seen this scenario before, and I think the blinking light usually means there’s activity but not consistent, so maybe B is the right choice.

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