Network TroubleshootingQuestion 90 of 100
An access switch port connected to a PC keeps going into an err-disabled state. Which security feature most likely triggered this?
a.Quality of Service
b.Link aggregation
c.Spanning tree root guard
d.Port security violation
Explanation
A port security violation can place a port into err-disabled state when it detects more MAC addresses than allowed. Reviewing the configured maximum and violation mode reveals the cause. Clearing the condition and correcting the setup restores the port.
Practice all 100 questions free — no signup required.
Related questions on this topic
- Which utility resolves a hostname to its IP address and can query specific DNS record types?
- A user reports they can access internal resources but not the internet. Other users are unaffected. What should the technician check first on that host?
- Which command tests basic reachability to a remote host by sending ICMP echo requests?
- Intermittent connectivity affects devices only during business hours, correlating with heavy equipment operation nearby. Which cabling issue is the likely culprit?
- A pair of switch ports negotiated a duplex mismatch. Which symptom is most characteristic of this condition?
- After confirming a fix resolves the reported issue, which troubleshooting step should be performed next?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against CompTIA Network+ (N10-009) · How we review