Identify interface and cable issues (collisions, errors, mismatch duplex, and/or speed)
4 practice questions under this official exam objective (200-301) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
Intermittent Fiber Connectivity: Interface Errors or Cable Fault?
This CCNA 200-301 troubleshooting item examines a new single-mode fiber link between SiteA and SiteB where SiteA users see intermittent connectivity,
Switch Counters Incremented When a Frame Fails FCS
When a received frame on a switch interface fails the Frame Check Sequence, the interface increments both the CRC error counter and the aggregate inpu
Diagnosing Router Interface Output Drops as Oversubscription
In a 'show interface' output, a massive Total output drops count (here 135M) shows the egress interface is overloaded — more traffic offered than it c
Interface Instability Caused by a Half-Duplex / Duplex Mismatch
A rising 'collisions' counter on a link is a classic duplex-mismatch symptom: one side runs full-duplex while the peer is forced to half-duplex. The r