Engineer Information Communications case studies
Engineer Information Communications · Put your knowledge to work in context.
The Engineer Information Communications (정보통신기사) is a Korean national technical certification for engineers who design, build, and operate communication systems and networks. Candidates typically work in telecom carriers, network integration, broadcasting and transmission, or public-sector IT, and many take it to strengthen a technical portfolio or satisfy employer requirements. The Engineer Information Communications case studies are 5 cases and about 2,526 words.
1IPv6 Large Transfers Stall Behind a Filtered Tunnel
A university research building has migrated its 1 Gbit/s campus uplink to dual-stack IPv4/IPv6. IPv4 transfers are normal, but after the change, several Linux compute nodes cannot complete large HTTPS downloads over IPv6: the TCP handshake finishes, the TLS ClientHello is sent, then the connection stalls until timeout.
510 words, about 3 min2Warehouse Wi-Fi With 80 MHz Channels and Roaming Voice Clients
A 12,000 m² automated warehouse uses 12 ceiling-mounted 5 GHz access points, all configured for 80 MHz channels and 30 dBm EIRP. Sixty handheld scanners, 25 AGVs, and 10 voice-over-Wi-Fi headsets share the network.
526 words, about 3 min3GPON Extension Exceeds Its Optical Power Budget
A regional ISP is extending GPON to a new housing estate. The design uses a class B+ OLT with a 28 dB optical budget at 1490 nm downstream, a 1:32 splitter with 17.5 dB insertion loss, 20 km of single-mode fiber at 0.35 dB/km, four connectors at 0.5 dB each, six fusion splices at 0.1 dB each, and a 3 dB design margin.
515 words, about 3 min4OAuth Consent Phishing in a Finance Department
At 09:10 on a Monday, a 400-user manufacturer's security team receives an alert: two finance users granted a Microsoft 365 OAuth application named 'InvoiceSync Helper' permission to read mail. The app's publisher is unverified.
471 words, about 2 min5Point-to-Point 5 GHz Link EIRP and DFS Compliance
A rural ISP plans 20 point-to-point links over 18 km using 5 GHz licence-exempt radios. The radio's maximum conducted output is 23 dBm; the selected antenna has 14 dBi gain and 1.5 dB cable/connector loss.
504 words, about 3 min