Match each network troubleshooting scenario to its most likely root cause.
- A workstation receives an IP address of 169.254.10.5 and can only communicate with other local hosts on the same physical link.DHCP server unreachability resulting in Automatic Private IP Addressing (APIPA).
- A user experiences severe Wi-Fi signal degradation and packet loss whenever a breakroom microwave is in operation nearby.2.4 GHz RF interference from household electronic appliances.
- An Ethernet port LED activity indicator remains unlit after plugging in a known-good patch cable into a wall jack.Physical layer disconnection or a disabled switch port.
- A client laptop repeatedly fails to authenticate to an Enterprise WPA3 network following a recent password update.Stale or cached 802.1X network authentication credentials.
Cevap
169.254.x.x IP address matches DHCP unreachability (APIPA); Microwave interference matches 2.4 GHz RF interference; Unlit Ethernet LED matches physical layer disconnection or disabled port; Wi-Fi authentication failure post-password change matches stale cached 802.1X credentials.
Each symptom directly corresponds to a fundamental networking concept tested on the CompTIA A+ exam: APIPA indicates a DHCP failure; microwaves emit 2.4 GHz RFI; an unlit Ethernet LED with a known-good cable points to physical layer disconnection; and repeated wireless authentication prompts after a password change point to stale cached RADIUS/802.1X credentials.
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Anahtar Kavram
Wired and Wireless Network Issues Identification and Cause Mapping