Implementing Cisco Collaboration Cloud and Edge Infrastructure (CLCEI) — Question 81

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 Expressway-C IP is 192.168.20.10/24. The default gateway for each subnet is the first useable address. How must the Expressway-E be configured to allow proper routing to the internal and external networks?

Answer options

• A. IPv4 gateway: 172.16.100.1, and a static route for the 192.168.100.0/24 subnet using LAN1
• B. IPv4 gateway: 192.168.100.1, and a static route for the 192.168.20.0/24 subnet using LAN1
• C. IPv4 gateway: 192.168.100.1, and a static route for the 172.16.100.0/24 subnet using LAN2
• D. IP v4 gateway: 172.16.100.1, and a static route for the 192.168.20.0/24 subnet using LAN1

Correct answer: D

Explanation

The correct configuration (D) specifies the external gateway for proper routing to the external network and includes a static route for the internal subnet. Option A is incorrect as it uses the wrong gateway and static route. Option B incorrectly routes the internal subnet with an incorrect gateway. Option C incorrectly uses LAN2 for the internal subnet route, which is not valid.