PCPP2 Network Programming Practice Question
In a Python TCP server, what is the primary purpose of the backlog parameter in the listen(backlog) method?
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
✓
It defines the maximum length of the queue of pending connections.
The backlog defines the maximum number of queued connections allowed before the OS starts rejecting new ones.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It sets the timeout for idle client sockets.
Why it's wrong here
Timeouts are managed via settimeout().
- ✗
It limits the total number of connected clients.
Why it's wrong here
It limits pending, unaccepted connections, not active ones.
- ✗
It specifies the maximum number of bytes per packet.
Why it's wrong here
Packet size is handled by the OS and application logic, not listen().
- ✓
It defines the maximum length of the queue of pending connections.
Why this is correct
The backlog value represents the number of unaccepted connections the system will queue.
Visual reference
About these practice questions
This PCPP2 question is part of Courseiva's 194-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP2 practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCPP2 exam.