Network engineer

Roles and Responsibilities:
Core Networking & Switching:
Strong understanding of STP (Spanning Tree Protocol), BPDU, loop prevention, Port Fast
Switch loop detection mechanisms
VLANs, trunking, and VTP operations (including switch replacement scenarios)
Ether Channel / Port-Channel concepts and design considerations
v PC (Virtual Port Channel) – concepts and advantages
Switch stacking – advantages and use cases
DHCP & Layer 2 Security:
DHCP deep dive (DORA process) and packet flow
IP allocation process via DHCP
DHCP Relay (same & inter-VLAN scenarios)
DHCP Snooping and security implementation
Wireless & Access Layer:
Access Point troubleshooting steps
CAPWAP protocol and relevant commands
Routing & L3 Concepts:
OSPF fundamentals
BGP fundamentals, neighbor establishment and troubleshooting
BGP soft reset vs hard reset
Route selection behavior (e BGP vs i BGP)
Route redistribution (OSPF ↔ BGP) and multi-domain connectivity
High Availability & Design:
HSRP concepts and gateway redundancy
Primary/secondary core switch design
Uplink design and failover behavior
Troubleshooting & Validation:
Service/port validation (e.g., verifying port 22 reachability from L3 devices)
Real-time troubleshooting approach
Transport Layer:
Deep understanding of TCP vs UDP