- A
A successful ping to 127.0.0.1 confirms that the TCP/IP stack on the local host is functional.
Pinging the loopback address tests the local host's TCP/IP protocol stack without sending traffic onto the network.
- B
If ping to the default gateway fails, the issue is certainly caused by a faulty Ethernet cable.
Why wrong: A failed gateway ping could be due to many reasons: gateway firewall blocking ICMP, VLAN misconfiguration, switch port outage, or incorrect gateway IP.
- C
An ipconfig output showing an IPv4 address of 169.254.x.x indicates the DHCP client could not obtain an IP address and self-assigned an APIPA address.
APIPA addresses are assigned when a DHCP server is unavailable or unreachable, and the client's default gateway will be blank, limiting connectivity to the local link only.
- D
A tracert that shows 'Request timed out' for the very first hop proves the local default gateway router is down or unreachable.
Why wrong: Routers often limit ICMP Time Exceeded responses, or firewalls on the gateway or host may block the necessary ICMP replies, making hops appear timed out even if the router is functioning.
- E
Running ipconfig /release followed by ipconfig /renew will always restore connectivity if the Ethernet cable is unplugged and re-plugged.
Why wrong: The /release and /renew commands send DHCP broadcasts to obtain a lease. If the DHCP server is not available, exhausted, or blocked, the client will still fail, even with a good cable.
Quick Answer
The correct answer identifies that an ipconfig output showing an IPv4 address of 169.254.x.x indicates the DHCP client could not obtain an IP address and self-assigned an APIPA address. This is accurate because when a DHCP discovery fails, Windows automatically assigns an address from the 169.254.0.0/16 range, which has no default gateway and thus prevents any communication beyond the local subnet. On the CCNA 200-301 v2 exam, this scenario tests your ability to interpret ipconfig, ping, and tracert outputs during network troubleshooting—a common trap is mistaking APIPA for a valid DHCP lease, so remember that 169.254.x.x always means no DHCP server was reachable. For exam success, pair this with the foundational step of pinging 127.0.0.1 to verify the local TCP/IP stack before moving outward. A helpful memory tip: “169.254 means no server to serve.”
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 TWO statements accurately describe the use of ipconfig, ping, and tracert when troubleshooting a client that cannot reach a remote server?
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
A successful ping to 127.0.0.1 confirms that the TCP/IP stack on the local host is functional.
Option A is correct because pinging the loopback address 127.0.0.1 tests the local TCP/IP stack without sending any frames onto the network. A successful reply confirms that the IP protocol, routing table, and network interface driver are functioning correctly on the local host. This is a foundational step in troubleshooting, as it isolates the problem to the local machine if the ping fails.
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.
- ✓
A successful ping to 127.0.0.1 confirms that the TCP/IP stack on the local host is functional.
Why this is correct
Pinging the loopback address tests the local host's TCP/IP protocol stack without sending traffic onto the network.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
If ping to the default gateway fails, the issue is certainly caused by a faulty Ethernet cable.
- ✓
An ipconfig output showing an IPv4 address of 169.254.x.x indicates the DHCP client could not obtain an IP address and self-assigned an APIPA address.
Why this is correct
APIPA addresses are assigned when a DHCP server is unavailable or unreachable, and the client's default gateway will be blank, limiting connectivity to the local link only.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A tracert that shows 'Request timed out' for the very first hop proves the local default gateway router is down or unreachable.
- ✗
Running ipconfig /release followed by ipconfig /renew will always restore connectivity if the Ethernet cable is unplugged and re-plugged.
Why it's wrong here
The /release and /renew commands send DHCP broadcasts to obtain a lease. If the DHCP server is not available, exhausted, or blocked, the client will still fail, even with a good cable.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓A successful ping to 127.0.0.1 confirms that the TCP/IP stack on the local host is functional.Correct answer▾
Why this is correct
Pinging the loopback address tests the local host's TCP/IP protocol stack without sending traffic onto the network.
✗If ping to the default gateway fails, the issue is certainly caused by a faulty Ethernet cable.Wrong answer — click to see why▾
Why this is wrong here
A single cable fault is only one of many possibilities; more testing is needed before concluding physical layer failure.
✗A tracert that shows 'Request timed out' for the very first hop proves the local default gateway router is down or unreachable.Wrong answer — click to see why▾
Why this is wrong here
Timed-out hops in tracert do not directly prove the router is down; it may simply not be generating ICMP Time Exceeded messages.
✗Running ipconfig /release followed by ipconfig /renew will always restore connectivity if the Ethernet cable is unplugged and re-plugged.Wrong answer — click to see why▾
Why this is wrong here
These commands do not guarantee a lease; the DHCP server must be operational and reachable.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a failed ping to the default gateway always points to a physical layer issue, when in fact it could be due to logical misconfigurations, firewall rules, or the gateway itself being operational but not responding to ICMP.
Trap categories for this question
Command / output trap
The /release and /renew commands send DHCP broadcasts to obtain a lease. If the DHCP server is not available, exhausted, or blocked, the client will still fail, even with a good cable.
Detailed technical explanation
How to think about this question
The loopback address 127.0.0.1 is defined in RFC 1122 and is not associated with any physical network interface; packets sent to it are processed internally by the network stack. APIPA (Automatic Private IP Addressing), defined in RFC 3927, uses the 169.254.0.0/16 range and is a fallback mechanism when a DHCP server is unreachable. Tracert uses ICMP Time Exceeded messages (or ICMP Echo Replies in some implementations) to map the path; a timeout on the first hop can also occur if the router is configured to deprioritize or drop ICMP traffic, which is a common security practice.
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 200-301 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 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A successful ping to 127.0.0.1 confirms that the TCP/IP stack on the local host is functional. — Option A is correct because pinging the loopback address 127.0.0.1 tests the local TCP/IP stack without sending any frames onto the network. A successful reply confirms that the IP protocol, routing table, and network interface driver are functioning correctly on the local host. This is a foundational step in troubleshooting, as it isolates the problem to the local machine if the ping fails.
What should I do if I get this 200-301 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: Jun 25, 2026
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