Network Engineer

Roles and Responsibilities:

Core Networking & Switching:

Strong understanding of STP (Spanning Tree Protocol), BPDU, loop prevention, PortFast

Switch loop detection mechanisms

VLANs, trunking, and VTP operations (including switch replacement scenarios)

EtherChannel / Port-Channel concepts and design considerations

vPC (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 ...

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