Network Routing & Switching

Beginner70 ptsNetworkingRoutingSwitching

Objective

Internet → router → firewall → switches → hosts — path and trust zones.

Cyber Flow Explorer · 3 steps · Network / Sequence / Packet / Code.

Isolated browser lab. Practice here first — no live targets. Optional deeper practice lives in the Academy library after you finish this room.

Answer panel

Challenge workspace

Complete the room tasks, then submit here to mark the room done.

CYNARKS|Cyber Flow Explorer

Teaching simulation · not live capture

Network Routing & Switching

Lab diagram only.

Real world · Enterprise traffic enters from the Internet, hits an edge router/firewall, then fans out through access switches to servers and workstations.

Attack · Flat networks let attackers pivot L2/L3 once inside — segmentation limits blast radius.

Defense · Default-deny firewall rules, VLANs, and DMZ placement keep exposure intentional.

Control · Default-deny perimeter + explicit allow rules
Control · Separate LAN / DMZ / management VLANs
Control · Least-privilege east-west (microseg when mature)

1. Edge

Internetuser

Firewallpolicy

RouterL3

HostDMZ

Edge

Packet from the Internet arrives at the enterprise edge firewall.

Ingress

#1 client → fw Edge Ingress

Space · ← → · R restart

Hint

Segment exposed services.

Why this is correct

Routing + switching + firewall policy create trust zones.