Networking Case Studies¶
20 incident case studies for hands-on troubleshooting practice.
| Case Study | Description |
|---|---|
| Arp Flux Duplicate Ip | ARP Flux / Duplicate IP |
| Asymmetric Routing One Direction | Asymmetric Routing / One-Direction Failure |
| Bgp Peer Flapping | BGP Peer Flapping |
| Dhcp Relay Broken | DHCP Not Working on Remote VLAN |
| Dns Resolution Slow | DNS Resolution Taking 5+ Seconds Intermittently |
| Dns Split Horizon Confusion | DNS Split-Horizon Confusion |
| Duplex Mismatch Symptoms | Duplex Mismatch |
| Firewall Shadow Rule | Firewall Shadow Rule |
| Jumbo Frames Partial | Jumbo Frames Enabled But Some Paths Failing |
| Lacp Mismatch One Link Hot | LACP Mismatch / One Link Hot |
| Mtu Blackhole Tls Stalls | MTU Black Hole / TLS Stalls |
| Multicast Not Crossing Router | Multicast Traffic Not Crossing Router |
| Nat Exhaustion Intermittent | NAT Port Exhaustion / Intermittent Failures |
| Network Loop Broadcast Storm | Network Experiencing Broadcast Storm and High CPU on Switches |
| Ospf Stuck In Exstart | OSPF Adjacency Stuck in ExStart/Exchange State |
| Proxy Arp Causing Issues | Proxy ARP Causing Unexpected Routing Behavior |
| Source Routing Policy Miss | Traffic From Specific Source Not Taking Expected Path |
| Ssl Cert Chain Incomplete | TLS Works From Some Clients But Fails From Others |
| Tcp Rst After Idle | TCP Connections Reset After Idle Period |
| Vlan Trunk Mistag | VLAN Trunk Mistag |
Pages that link here¶
- ARP Flux / Duplicate IP
- Asymmetric Routing / One-Direction Failure
- BGP Peer Flapping
- Case Studies
- DHCP Not Working on Remote VLAN
- DNS Resolution Taking 5+ Seconds Intermittently
- DNS Split-Horizon Confusion
- DNS: The Eternal Enemy
- Duplex Mismatch
- Firewall Shadow Rule
- Jumbo Frames Enabled But Some Paths Failing
- LACP Mismatch / One Link Hot
- MTU Black Hole / TLS Stalls
- Master Curriculum: 40 Weeks
- Multicast Traffic Not Crossing Router