Ruankao Network Engineer (Intermediate) case studies
Ruankao Network Engineer (Intermediate) · Put your knowledge to work in context.
The Ruankao Network Engineer (中级) is a Chinese professional qualification exam for IT practitioners who design, build, and operate data networks. Candidates typically include network administrators, integration engineers, and technicians preparing for roles with broader design responsibility. The Ruankao Network Engineer (Intermediate) case studies are 5 cases and about 4,610 words.
1Gigabit to a Mezzanine Desk Bank Over a 132 m Cat5e Run
A logistics company has fitted out a mezzanine office whose cable path is 132 m from the floor distribution frame. The contractor pulled a single Cat5e UTP bundle for 12 desks, and for about 40 m of the run it shares a metal tray with the 380 V feeder of a variable-frequency-driven conveyor.
870 words, about 4 min2Intermittent VLAN 20 Outages After a Second Uplink Is Re-enabled
A three-floor office refurbishment left access switches AS1 and AS2 each dual-homed to core switches C1 and C2, forming a square of 802.1Q trunks running Rapid STP. VLANs are 10 (voice), 20 (data), 30 (guest) and 99 (in-band management); the design intent is that C1 is root for VLANs 10 and 20 and C2 for VLAN 30.
864 words, about 4 min3OSPF Adjacency Stuck in EXCHANGE and Area 2 Prefixes That Never Arrive
A company is migrating a six-router WAN from static routes to OSPF and then splitting it into areas. HQ-R1 is the intended ABR: Gi0/0 sits in area 0 toward the provider, Gi0/1 sits in area 1 toward branch routers BR1 and BR2.
1,009 words, about 5 min4HTTPS Stalls and Large DNS Replies Fail Across an IPsec Tunnel
After a merger, head office reaches a new cloud VPC through a route-based IPsec tunnel whose interface MTU is 1400. Hosts on the office LAN use 1500.
870 words, about 4 min5Internal Users Cannot Reach the Public ERP URL, and Two Rules Nobody Owns
A manufacturer with 240 staff publishes an ERP portal from a DMZ to about 60 business partners over HTTPS. The perimeter firewall has three zones - inside, DMZ and outside - and a rule set maintained by a contractor who has since left.
997 words, about 5 min