Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Why is shutting down unused switch ports considered a useful hardening measure?
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
Because it removes unused active connection points and reduces attack surface.
This is correct because unused enabled ports are avoidable exposure points.
B
Distractor review
Because it converts all other ports into trunks.
This is wrong because disabling unused ports does not change the role of the other interfaces.
C
Distractor review
Because it replaces VLAN segmentation.
This is wrong because port shutdown and VLAN design solve different problems.
D
Distractor review
Because it forces devices to use SSH.
This is wrong because unused-port shutdown does not enforce management protocols.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is selecting answers that confuse shutting down unused ports with other security mechanisms. For example, some might incorrectly believe that disabling unused ports converts other ports into trunks or replaces VLAN segmentation. Others may think it enforces secure management protocols like SSH. These misconceptions arise because candidates conflate different security controls. The key is to remember that shutting down unused switch ports specifically removes unused active connection points, thereby reducing the attack surface. It does not alter port roles or management protocol requirements. Misreading this can lead to choosing incorrect options that describe unrelated functions.
Technical deep dive
How to think about this question
Shutting down unused switch ports is a fundamental security hardening practice in Cisco networking and the CCNA exam context. Switch ports that are enabled but not connected to authorized devices represent unnecessary attack vectors. Attackers can exploit these open ports to gain unauthorized access, launch VLAN hopping attacks, or introduce rogue devices into the network. By administratively disabling these ports, network administrators eliminate these potential entry points, effectively reducing the network's attack surface. The decision to shut down unused ports follows a straightforward security principle: prevent exposure rather than manage risk after the fact. Cisco switches allow administrators to administratively disable ports using the "shutdown" command in interface configuration mode. This action ensures that no traffic can ingress or egress through that port until it is explicitly re-enabled. This measure complements other security controls such as VLAN segmentation and port security but does not replace them, as each control addresses different aspects of network security. A common exam trap is confusing port shutdown with other security features like VLAN segmentation or management protocol enforcement. Disabling unused ports does not convert other ports into trunks nor does it enforce SSH usage for device management. Practically, leaving unused ports enabled can lead to unauthorized device connections, but shutting them down removes this risk entirely. Understanding this distinction is critical for correctly answering related CCNA questions and applying best practices in real-world Cisco network environments.
KKey Concepts to Remember
- Shutting down unused switch ports removes unnecessary active connection points, thereby reducing the network's attack surface.
- Administratively disabling a switch port prevents any traffic from entering or leaving that port until it is re-enabled.
- Unused enabled ports represent avoidable exposure points that can be exploited by unauthorized devices or attackers.
- Port shutdown is a distinct security control that complements VLAN segmentation but does not replace it.
- Disabling unused ports does not convert other ports into trunk ports or change their operational roles.
- Shutting down unused ports does not enforce management protocols such as SSH; these require separate configuration.
- Effective network hardening involves removing potential vulnerabilities rather than only monitoring or managing them.
- Cisco switches use the 'shutdown' command in interface configuration mode to administratively disable ports.
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?
Shutting down unused switch ports removes unnecessary active connection points, thereby reducing the network's attack surface.
What is the correct answer to this question?
The correct answer is: Because it removes unused active connection points and reduces attack surface. — Shutting down unused switch ports reduces attack surface. In practical terms, an enabled port that no legitimate device needs is an unnecessary entry point into the network. Disabling that port removes the opportunity entirely instead of trying to manage a risk that should not exist. This is a simple control, but it is effective precisely because it removes exposure rather than just monitoring it.
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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