Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
Which two statements accurately describe why DNS issues can look like general connectivity problems to users?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Users often access services by name, so failed name resolution can feel like total connectivity loss.
This is correct because users usually experience services through names rather than raw IP addresses.
B
Best answer
Testing by IP address versus hostname can help distinguish DNS issues from raw path issues.
This is correct because that comparison is a classic troubleshooting technique.
C
Distractor review
DNS failure automatically means the default gateway is missing.
This is wrong because DNS and gateway issues are different problems.
D
Distractor review
If DNS fails, DHCP and NTP must also fail immediately.
This is wrong because those services are separate.
E
Distractor review
DNS replaces the need for routing between subnets.
This is wrong because naming and routing are different functions.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is assuming that DNS failure means the default gateway or other network infrastructure is missing or malfunctioning. Candidates might incorrectly link DNS issues to routing failures or DHCP and NTP outages, which are separate services. This misunderstanding leads to wasted troubleshooting effort on routing tables or gateway configurations when the real problem lies in DNS server availability or client resolver settings. The exam tests your ability to isolate DNS as an application-layer service distinct from network-layer connectivity.
Technical deep dive
How to think about this question
Domain Name System (DNS) is a critical IP service that translates human-friendly domain names into IP addresses, enabling users to access network resources by name rather than numeric addresses. In Cisco networking and the CCNA context, DNS operates as an application-layer protocol that supports name resolution, which is essential for user convenience and network usability. When DNS fails, users cannot resolve hostnames to IP addresses, which can appear as a total loss of connectivity even if the underlying routing and switching infrastructure is functioning correctly. Troubleshooting DNS issues involves distinguishing between name resolution problems and actual network path failures. A common and effective method is to test connectivity using IP addresses directly instead of hostnames. If pinging an IP address succeeds but pinging a hostname fails, the issue is isolated to DNS rather than routing, switching, or physical connectivity. This distinction is vital in Cisco environments where multiple IP services coexist, and understanding the separation between transport-layer reachability and application-layer naming prevents misdiagnosis. A frequent exam trap is assuming that DNS failure implies broader network failures such as missing default gateways or DHCP and NTP service outages. These services operate independently, and DNS failure does not inherently disrupt routing or other IP services. Practically, users may report "no connectivity" because they rely on names, but network engineers must verify the actual transport path before concluding a network outage. Recognizing this separation helps avoid unnecessary configuration changes and focuses troubleshooting efforts on DNS servers or client resolver settings.
KKey Concepts to Remember
- DNS translates human-readable domain names into IP addresses, enabling users to access network resources by name rather than numeric IP addresses.
- Users often perceive DNS failures as total connectivity loss because they typically use hostnames to access services instead of IP addresses.
- Testing connectivity by IP address versus hostname helps isolate DNS resolution issues from underlying network path or routing problems.
- DNS operates independently of routing protocols and default gateway configurations, so DNS failure does not imply missing or incorrect gateway settings.
- DHCP, NTP, and DNS are separate IP services; failure in one does not automatically cause failure in the others.
- Effective troubleshooting requires understanding the distinction between application-layer name resolution and network-layer routing and switching.
- Cisco devices rely on DNS for hostname resolution but maintain routing and forwarding functions independently of DNS availability.
- Misinterpreting DNS failure as a network outage can lead to unnecessary changes in routing or physical connectivity configurations.
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
DNS translates human-readable domain names into IP addresses, enabling users to access network resources by name rather than numeric IP addresses.
What is the correct answer to this question?
The correct answer is: Users often access services by name, so failed name resolution can feel like total connectivity loss. — DNS issues can look like general connectivity problems because many users think in terms of names, not IP addresses. In practical terms, they may report that 'the network is down' when the actual routed path works but hostname resolution does not. That is why testing by IP versus name is such a useful troubleshooting step. The distinction between transport reachability and naming is critical in user-facing support.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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