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ISC2 CC Practice Question: Which three of the following are best practices…
Which three of the following are best practices for securing a network switch? (Choose three.)
⚠ Common exam trap
ISC2 often tests the misconception that Telnet is acceptable for management if a password is set, but the exam expects you to recognize that Telnet lacks encryption and is therefore never a best practice for securing a switch.
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
✓
Disable unused ports.
Disabling unused ports on a network switch prevents unauthorized physical access and eliminates the risk of an attacker connecting to an open port to launch attacks such as ARP spoofing or DHCP starvation. This is a fundamental security best practice that reduces the attack surface by ensuring that only necessary ports are active and can be administratively controlled.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable Telnet for remote management.
Why it's wrong here
Telnet transmits credentials in cleartext; use SSH.
- ✓
Disable unused ports.
Why this is correct
Reduces attack surface.
- ✓
Use VLANs to segment traffic.
Why this is correct
Limits broadcast domains and improves security.
- ✓
Enable STP protection features like BPDU guard.
Why this is correct
Prevents rogue switch attacks.
- ✗
Set all ports to trunk mode by default.
Why it's wrong here
Trunking should be disabled on access ports to prevent VLAN hopping.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 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 CC exam.