Refer to the exhibit.

An engineer must configure a floating static route on an external EIGRP network. The destination subnet is the /29 on the LAN Interface of R86. Which command must be executed on R14?

A floating static route serves as a backup to a dynamically learned route. To function as a backup, its administrative distance (AD) must be higher than the primary route's AD. The question specifies the primary route is learned via external EIGRP, which has a default AD of 170. Therefore, the floating static route must have an AD greater than 170. The destination LAN on R86 has an IP of 10.80.65.170/29. The correct network address for this is 10.80.65.168 with a subnet mask of 255.255.255.248. The next-hop IP address from R14 is R86's serial interface, 10.73.65.66. Option C correctly combines the network, mask, next-hop, and an AD of 171, which is greater than 170.

A. The network address, mask, and administrative distance are incorrect. An AD of 1 would make this the primary route, not a backup. B. The network address, mask, and next-hop are incorrect. An AD of 89 is lower than EIGRP's AD, so it would not be a floating route. D. The command syntax is invalid. It incorrectly uses a wildcard mask instead of a subnet mask and has an incorrect next-hop address.

1. Cisco Systems, Inc., Cisco IOS IP Routing: Protocol-Independent Command Reference, "ip route" command documentation. This document confirms the syntax ip route prefix mask {ip-address | interface-type interface-number [ip-address]} [distance]. It specifies that distance is the administrative distance for the route.

2. Cisco Systems, Inc., IP Routing: EIGRP Configuration Guide, Cisco IOS Release 15M&T, "EIGRP Administrative Distance". This guide states, "The administrative distance for an external EIGRP route is 170 by default."

3. Odom, W. (2019). CCNA 200-301 Official Cert Guide, Volume 1. Cisco Press. Chapter 15, "Static Routing," section "Floating Static Routes," explains that a floating static route is configured with a higher administrative distance than the dynamic routing protocol it is intended to back up. Table 15-1 lists the default AD for External EIGRP as 170.