The answer is neighborhood congestion from shared bandwidth. Cable internet operates on a shared bandwidth model, meaning all subscribers in a local area contend for the same upstream and downstream channels on the provider’s node. During peak evening hours, when many users stream, game, or work, this shared medium becomes saturated, causing significant speed drops for everyone—a problem exacerbated by older DOCSIS 3.0 modems, which lack the channel-bonding efficiency of newer DOCSIS 3.1 hardware. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of how ISP network architecture affects real-world performance, often appearing as a trap where students mistakenly blame the modem, router, or internal wiring. A common memory tip: think of cable internet like a neighborhood water main—everyone sharing the same pipe means you get less flow when everyone turns on their faucet at once.
220-1101 Internet Connection Types Practice Question
This 220-1201 practice question tests your understanding of internet connection types. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 small office uses a cable internet connection with a DOCSIS 3.0 modem. Users complain that speeds drop significantly during peak evening hours. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Neighborhood congestion from shared bandwidth.
Cable internet uses a shared bandwidth model where all subscribers in a neighborhood contend for the same upstream and downstream channels. During peak usage, congestion reduces throughput for everyone, especially with older DOCSIS 3.0 modems.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 modem's firmware is out of date.
Why it's wrong here
Outdated firmware could cause issues, but it would not specifically correlate with peak hours.
✗
The office's router is overheating.
Why it's wrong here
Overheating would be constant or random, not tied to evening hours.
✓
Neighborhood congestion from shared bandwidth.
Why this is correct
Cable internet is a shared medium; increased usage by neighbors in the evening causes congestion and slower speeds.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Maintenance is typically scheduled during low-usage periods, not every evening during peak hours.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 220-1201 OSPF questions on adjacency and route selection.
Internet Connection Types — This question tests Internet Connection Types — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Neighborhood congestion from shared bandwidth. — Cable internet uses a shared bandwidth model where all subscribers in a neighborhood contend for the same upstream and downstream channels. During peak usage, congestion reduces throughput for everyone, especially with older DOCSIS 3.0 modems.
What should I do if I get this 220-1201 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 220-1201 OSPF questions on adjacency and route selection.
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?
OSPF neighbours must agree on key parameters.
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