. It simulates a real-world scenario where a company (often identified as the Carl I. Samson Company or C.I.S. Co) has acquired another business with multiple locations, requiring a unified, secure network infrastructure. Core Objectives & Scenario
To successfully integrate these business networks, administrators must implement an optimized, secure topology utilizing dual-stack infrastructure, robust layer 2 mitigation, and structured edge routing. This article provides a comprehensive technical breakdown of how to solve the entire case study. Core Technical Pillars
Configure sub-interfaces on the router to act as default gateways for each local VLAN subnet. Ensure you match the encapsulation IDs with your active VLAN matrix.
Router# configure terminal Router(config)# interface gigabitethernet 0/0 Router(config-if)# no shutdown Router(config)# interface gigabitethernet 0/0.10 Router(config-subif)# encapsulation dot1Q 10 Router(config-subif)# ip address 192.168.10.1 255.255.255.128 Router(config)# interface gigabitethernet 0/0.20 Router(config-subif)# encapsulation dot1Q 20 Router(config-subif)# ip address 192.168.10.129 255.255.255.192 Use code with caution. Phase 4: Dynamic IP Allocation (DHCPv4 Server) ccna-2v7.0 case study -rev b-
Feeds local workstations, endpoints, and corporate compute environments.
Switch(config)# interface gigabitethernet 0/1 Switch(config-if)# switchport mode trunk Switch(config-if)# switchport trunk native vlan 999 Switch(config-if)# switchport trunk allowed vlan 10,20,30,99 Use code with caution. Phase 3: Inter-VLAN Routing (Router-on-a-Stick)
This ACL, applied inbound on the Guest subinterface, blocks Guest packets destined for Employee and Management VLANs, but permits everything else (including internet-bound traffic). Co) has acquired another business with multiple locations,
New York Router:
Manually define paths between site summaries (e.g., Phoenix and Chicago summaries) using exit interfaces or next-hop addresses. Default Routes:
Any unassigned switch port presents an open physical entry point into the corporate intranet. Secure these ports by moving them to the black-hole VLAN and shutting them down: Rev B usually requires:
The case study includes a connection from R1 to an ISP router (often named ISP or Cloud). Rev B usually requires:
, a firm based in Bangor, Maine, that has recently acquired a corporation with branch offices in Phoenix, AZ, and Chicago, IL.