This PCAP practice question tests your understanding of object-oriented programming. 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.
class Shape:
def area(self):
return 0
class Circle(Shape):
def __init__(self, radius):
self.radius = radius
def area(self):
return 3.14 * self.radius ** 2
shapes = [Shape(), Circle(2)]
for s in shapes:
print(s.area(), end=' ')Refer to the exhibit. What is the output?
class Shape:
def area(self):
return 0
class Circle(Shape):
def __init__(self, radius):
self.radius = radius
def area(self):
return 3.14 * self.radius ** 2
shapes = [Shape(), Circle(2)]
for s in shapes:
print(s.area(), end=' ')12.56 0
Why wrong: Incorrect; order is Shape then Circle.
Error
Why wrong: No error.
0 0
Why wrong: Incorrect; Circle overrides area.
0 12.56
Correct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
0 12.56
First object is Shape, area returns 0. Second is Circle, area returns 3.14*4=12.56.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
12.56 0
Why it's wrong here
Incorrect; order is Shape then Circle.
Error
Why it's wrong here
No error.
0 0
Why it's wrong here
Incorrect; Circle overrides area.
0 12.56
Why this is correct
Correct.
Related concept
OSPF neighbours must agree on key parameters.
Common exam traps
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
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.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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 PCAP OSPF questions on adjacency and route selection.
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FAQ
Object-Oriented Programming — This question tests Object-Oriented Programming — OSPF neighbours must agree on key parameters..
The correct answer is: 0 12.56 — First object is Shape, area returns 0. Second is Circle, area returns 3.14*4=12.56.
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 PCAP OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 25, 2026
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