Question 430 of 1,020

Internet Connection Types →easyMultiple ChoiceObjective-mapped

Cable Internet Slow in Evenings

This 220-1201 practice question tests your understanding of internet connection types. 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.

A user complains that their internet is slow in the evenings, especially when streaming video. They have a cable modem and a wireless router. What is the most likely cause?

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The wireless router is outdated.
Why wrong: While an old router can cause issues, the timing of the slowdown points to network congestion, not hardware age.
B
The ISP is throttling streaming traffic.
Why wrong: Throttling is possible but less common than simple congestion; the pattern suggests peak usage contention.
C
Network congestion due to many users sharing the same cable node.
Cable internet is a shared medium, and evening congestion is a well-known issue.
D
Interference from other wireless networks.
Why wrong: Wireless interference can slow speeds but is not specifically tied to evening hours.

Full breakdown with real-world context →

Quick Answer

The answer is network congestion due to many users sharing the same cable node. This is the most likely cause because cable internet operates on a shared bandwidth model, where your local loop capacity is divided among all subscribers in your neighborhood. During peak usage times like evenings, when everyone is streaming video or browsing, this contention for bandwidth directly causes the slowdown you experience. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of how shared media networks degrade under load, often appearing as a scenario where a user’s speed drops consistently at the same time each day. A common trap is to blame the wireless router or interference, but those issues would be sporadic, not tied to the clock. Remember the memory tip: “Evening congestion is a node problem, not a router problem.”

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

✓

Network congestion due to many users sharing the same cable node.

C is correct because cable internet uses a shared coaxial cable node, and during peak evening hours, many subscribers in the same neighborhood are actively using the connection. This shared bandwidth leads to contention and reduced throughput, especially for high-bandwidth activities like streaming video, which is a classic symptom of node congestion rather than a local issue.

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.

✗
The wireless router is outdated.
Why it's wrong here
While an old router can cause issues, the timing of the slowdown points to network congestion, not hardware age.
✗
The ISP is throttling streaming traffic.
Why it's wrong here
Throttling is possible but less common than simple congestion; the pattern suggests peak usage contention.
✓
Network congestion due to many users sharing the same cable node.
Why this is correct
Cable internet is a shared medium, and evening congestion is a well-known issue.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Interference from other wireless networks.
Why it's wrong here
Wireless interference can slow speeds but is not specifically tied to evening hours.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between local wireless issues (interference, outdated hardware) and ISP-level shared medium congestion, and the trap here is that candidates blame the wireless router or interference because the symptom is 'slow internet,' but the evening-specific timing is the key clue that points to cable node oversubscription.

Detailed technical explanation

How to think about this question

Cable internet uses a hybrid fiber-coaxial (HFC) architecture where a single optical node serves 250–500 homes, all sharing the same upstream and downstream channels. During peak usage, the node's total capacity (e.g., 1 Gbps downstream shared among all users) is divided, causing per-user throughput to drop significantly. This is measured by the cable modem's signal-to-noise ratio (SNR) and upstream power levels, which can degrade under load, and is a common topic in DOCSIS 3.0/3.1 troubleshooting.

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.

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FAQ

Questions learners often ask

What does this 220-1201 question test?

Internet Connection Types — This question tests Internet Connection Types — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Network congestion due to many users sharing the same cable node. — C is correct because cable internet uses a shared coaxial cable node, and during peak evening hours, many subscribers in the same neighborhood are actively using the connection. This shared bandwidth leads to contention and reduced throughput, especially for high-bandwidth activities like streaming video, which is a classic symptom of node congestion rather than a local issue.

What should I do if I get this 220-1201 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 220-1201

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A home user complains that their internet is extremely slow during peak evening hours, but speed tests show fast results late at night. They have a cable modem connection. What is the most likely cause of this issue?

easy

A.The modem is overheating
✓ B.Bandwidth congestion from neighbors
C.A faulty Ethernet cable
D.The ISP is throttling video streaming

Why B: Cable internet uses a shared bandwidth model where multiple homes in the same neighborhood connect to a common node. During peak evening hours, increased simultaneous usage from neighbors causes congestion on this shared medium, resulting in slower speeds. Late-night tests are fast because fewer users are active, confirming the issue is contention-based rather than a hardware or throttling problem.

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