Quick Answer
The correct answer is the class loader subsystem, heap, and execution engine, as these are the three valid JVM components. The class loader subsystem dynamically loads compiled bytecode into memory, the heap is the runtime data area where all object instances and arrays are stored, and the execution engine interprets or just-in-time compiles the bytecode into native machine instructions. On the Oracle Java Foundations 1Z0-811 exam, this question tests your ability to distinguish between the JVM’s internal architecture and external tools like the compiler, which is part of the JDK, not the JVM. A common trap is confusing source code or the compiler with JVM components—remember that source code is human-readable input, and the compiler transforms it into bytecode before the JVM ever runs. For a quick memory tip, think of the JVM’s three core jobs: load (class loader), store (heap), and execute (execution engine).
This 1Z0-811 practice question tests your understanding of what is java. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which THREE are valid components of the Java Virtual Machine (JVM)?
Java source code (.java files)
Why wrong: Source code is compiled to bytecode before JVM involvement.
Java compiler (javac)
Why wrong: javac is not part of JVM; it runs before JVM.
Heap memory area
Heap is where all objects are allocated.
Execution engine
Execution engine interprets or JIT-compiles bytecode.
Class loader subsystem
Class loader loads .class files into JVM.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Heap memory area
Options B, D, and E are correct. Class loader (B) loads bytecode, heap (D) is where objects are stored, execution engine (E) executes bytecode. Option A (compiler) is part of JDK, not JVM. Option C (source code) is input to compiler, not JVM component.
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.
Java source code (.java files)
Why it's wrong here
Source code is compiled to bytecode before JVM involvement.
Java compiler (javac)
Why it's wrong here
javac is not part of JVM; it runs before JVM.
Heap memory area
Why this is correct
Heap is where all objects are allocated.
Related concept
OSPF neighbours must agree on key parameters.
Execution engine
Why this is correct
Execution engine interprets or JIT-compiles bytecode.
Related concept
OSPF neighbours must agree on key parameters.
Class loader subsystem
Why this is correct
Class loader loads .class files into JVM.
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 practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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 1Z0-811 OSPF questions on adjacency and route selection.
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FAQ
What is Java — This question tests What is Java — OSPF neighbours must agree on key parameters..
The correct answer is: Heap memory area — Options B, D, and E are correct. Class loader (B) loads bytecode, heap (D) is where objects are stored, execution engine (E) executes bytecode. Option A (compiler) is part of JDK, not JVM. Option C (source code) is input to compiler, not JVM component.
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 1Z0-811 OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 23, 2026
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