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

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