- A
for iface, ip in interfaces.items(): if ip != None: print(f'{iface}: {ip}')
Explicit None check.
- B
for iface, ip in interfaces.items(): if ip: print(f'{iface}: {ip}')
Iterates over items, checks truthiness of ip.
- C
for iface in interfaces.keys(): print(iface + ': ' + interfaces.get(iface))
Why wrong: Does not skip None; get returns None but prints None as string.
- D
for iface in interfaces: ip = interfaces[iface] if ip is not None: print(iface + ': ' + ip)
Accesses by key, checks for None explicitly.
- E
for iface in interfaces: if interfaces[iface]: print(iface, ':', interfaces[iface])
Truthiness check works for None.
Question 997 of 1,000
200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. 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 Python script needs to iterate over a dictionary of network interfaces and print each interface name and its IP address. The dictionary is structured as: {'GigabitEthernet1/0/1': '10.1.1.1', 'GigabitEthernet1/0/2': None}. Which THREE code snippets correctly iterate and print the key-value pairs, skipping entries with None? (Choose three.)
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
✓
for iface, ip in interfaces.items(): if ip != None: print(f'{iface}: {ip}')
Option A is correct because it uses the `.items()` method to iterate over key-value pairs, explicitly checks `if ip != None` to skip entries with `None`, and uses an f-string for clean output. This directly meets the requirement to skip `None` values while printing each interface name and IP address.
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.
- ✓
for iface, ip in interfaces.items(): if ip != None: print(f'{iface}: {ip}')
Why this is correct
Explicit None check.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
for iface, ip in interfaces.items(): if ip: print(f'{iface}: {ip}')
Why this is correct
Iterates over items, checks truthiness of ip.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
for iface in interfaces.keys(): print(iface + ': ' + interfaces.get(iface))
Why it's wrong here
Does not skip None; get returns None but prints None as string.
- ✓
for iface in interfaces: ip = interfaces[iface] if ip is not None: print(iface + ': ' + ip)
Why this is correct
Accesses by key, checks for None explicitly.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
for iface in interfaces: if interfaces[iface]: print(iface, ':', interfaces[iface])
Why this is correct
Truthiness check works for None.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between checking for `None` explicitly versus relying on truthiness, and the subtle formatting differences in print statements (comma vs. concatenation vs. f-strings) to catch candidates who overlook exact output requirements.
Detailed technical explanation
How to think about this question
In Python, `None` is a singleton object representing the absence of a value, and checking `if ip is not None` is more idiomatic than `if ip != None` because it avoids potential issues with custom `__eq__` methods. The `.items()` method returns a view object that dynamically reflects dictionary changes, making it efficient for iteration. In network automation, dictionaries like this are common when parsing device configurations where some interfaces may not have an IP assigned, and skipping `None` values prevents errors in downstream processing.
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 practitioner preparing for the 200-901 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this 200-901 question test?
Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: for iface, ip in interfaces.items(): if ip != None: print(f'{iface}: {ip}') — Option A is correct because it uses the `.items()` method to iterate over key-value pairs, explicitly checks `if ip != None` to skip entries with `None`, and uses an f-string for clean output. This directly meets the requirement to skip `None` values while printing each interface name and IP address.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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