Cisco Expressways are being deployed for Mobile and Remote Access. The Expressway-E internal interface (LAN1) IP is 192.168.100.10/24, and the external interface (LAN2) IP is 172.16.100.10/24. The…

Question

Options

• AIPv4 gateway: 172.16.100.1, and a static route for the 192.168.100.0/24 subnet using LAN1
• BIPv4 gateway: 192.168.100.1, and a static route for the 192.168.20.0/24 subnet using LAN1
• CIPv4 gateway: 192.168.100.1, and a static route for the 172.16.100.0/24 subnet using LAN2
• DIPv4 gateway: 172.16.100.1, and a static route for the 192.168.20.0/24 subnet using LAN1

• A
  3% (1)
• B
  3% (1)
• C
  10% (3)
• D
  83% (25)

Explanation

The Expressway-E has a dual-NIC configuration: LAN1 (internal, 192.168.100.10/24) and LAN2 (external, 172.16.100.10/24). The default gateway must be set to the external interface gateway (172.16.100.1) so that all internet-bound traffic is properly routed out LAN2. However, the Expressway-C resides on the 192.168.20.0/24 subnet, which is a different internal subnet from LAN1's 192.168.100.0/24. Therefore, a specific static route for 192.168.20.0/24 must be added via LAN1 so the Expressway-E can reach the Expressway-C. Setting the default gateway to an internal address (192.168.100.1) would break internet routing. Setting the static route for 192.168.100.0/24 via LAN1 is unnecessary since that is LAN1's own directly connected subnet.

No community discussion yet for this question.