Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Why is administratively 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
It reduces the attack surface by removing unnecessary network entry points.
This is correct because an unused enabled port is an unnecessary risk that can be eliminated by shutting it down.
B
Distractor review
It increases available bandwidth on the switch backplane.
This is wrong because disabling ports does not change backplane bandwidth.
C
Distractor review
It enables 802.1Q trunking on all remaining ports.
This is wrong because shutting down a port has no effect on trunk configuration of other ports.
D
Distractor review
It forces port security to activate automatically.
This is wrong because port security must be configured explicitly and does not activate from a shutdown.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is assuming that administratively shutting down unused switch ports automatically activates port security or changes trunking configurations. Some candidates mistakenly believe that disabling a port triggers security features like 802.1X or port security policies, but these must be explicitly configured. Others incorrectly think that shutting down ports increases switch backplane bandwidth or optimizes traffic flow, which is not true. The shutdown command only disables the physical port, preventing any device from connecting through it. Recognizing that this action solely reduces the attack surface by removing unnecessary entry points helps avoid these common misconceptions.
Technical deep dive
How to think about this question
Administratively shutting down unused switch ports is a fundamental security hardening technique in Cisco networking. Switch ports that are enabled but unused represent potential entry points for unauthorized devices, which can lead to network breaches or attacks. By disabling these ports, network administrators effectively reduce the attack surface, limiting opportunities for rogue devices to connect and exploit the network. This practice aligns with the principle of least privilege, ensuring only necessary network access is available. The decision to administratively shut down unused ports is based on the understanding that an active port, even if unused, can be exploited by attackers to gain physical access to the network. Cisco switches allow administrators to disable ports using the "shutdown" command in interface configuration mode, which prevents any traffic from passing through. This measure does not affect the switch’s backplane bandwidth or trunking configurations but strictly controls physical access points. It complements other security features like port security but does not replace them. A common exam trap is confusing the effect of shutting down ports with enabling other features such as automatic port security activation or bandwidth improvements. Disabling a port simply prevents any device from connecting through it; it does not automatically configure security policies or enhance switch performance. Understanding this distinction helps avoid selecting incorrect answers that imply additional functionality beyond the scope of administrative shutdown. Practically, this control is a straightforward, effective way to reduce unauthorized access risks without impacting legitimate network operations.
KKey Concepts to Remember
- Administratively shutting down unused switch ports prevents unauthorized devices from physically connecting to the network, reducing potential attack vectors.
- Cisco switches use the shutdown command in interface configuration mode to disable ports, stopping all traffic and access through those ports.
- Disabling unused ports does not affect switch backplane bandwidth or enable features like 802.1Q trunking on other ports.
- Port security features must be explicitly configured and do not activate automatically when a port is administratively shut down.
- Reducing the attack surface by disabling unused ports aligns with the principle of least privilege in network security.
- Leaving unused ports enabled increases risk without providing any operational benefit, making the network more vulnerable to opportunistic attacks.
- Administratively shutting down ports is a simple but effective hardening control that complements other security mechanisms like ACLs and port security.
- Understanding the difference between physical port state and security feature activation is critical to correctly answering CCNA exam questions on switch hardening.
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?
Administratively shutting down unused switch ports prevents unauthorized devices from physically connecting to the network, reducing potential attack vectors.
What is the correct answer to this question?
The correct answer is: It reduces the attack surface by removing unnecessary network entry points. — Unused active ports create unnecessary opportunity for unauthorized connection. In practical terms, if a port has no business purpose, leaving it enabled adds risk without adding value. Disabling it reduces attack surface and makes opportunistic access much harder. This is a simple but effective hardening control. It does not replace other protections, but it removes exposure that should not exist in the first place.
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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