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Difficulty: MediumIPv4 Static Routing

A network administrator is configuring a backup floating static route on router R3 to reach the remote destination network 192.168.50.0/24. The primary path to this network is dynamically learned via EIGRP with a default administrative distance of 90. The secondary path should route traffic through the next-hop IPv4 address 10.1.1.2.

Which TWO statements regarding this floating static route configuration are correct?

  1. The command `ip route 192.168.50.0 255.255.255.0 10.1.1.2 100` correctly configures the backup route.Answer
  2. The floating static route will be installed into the active IPv4 routing table only when the primary EIGRP route is removed.Answer
  3. C
    The command `ip route 192.168.50.0 255.255.255.0 10.1.1.2 80` configures a floating static route that serves as a backup path.
  4. D
    Assigning an administrative distance of 90 to the static route enables equal-cost load sharing across the EIGRP and static paths.

Answer

The correct choices are using the command `ip route 192.168.50.0 255.255.255.0 10.1.1.2 100` and recognizing that the route is installed into the routing table only when the primary EIGRP route is removed.
To create a floating static route that backs up an EIGRP path (AD 90), the static route must be configured with an administrative distance greater than 90. The command specifying an AD of 100 correctly accomplishes this. As a result, the router holds the static route in reserve and only installs it into the active IPv4 routing table if the primary EIGRP route is withdrawn.

Step-by-Step Solution

1
Identify the primary route's Administrative Distance (AD).
The primary path is learned via internal EIGRP, which has a default administrative distance of 90.
Floating static routes depend on AD ranking to remain inactive until the primary routing source drops.
2
Determine the required AD value for the floating static route.
The AD configured for the static route must be strictly greater than 90 (e.g., 100).
Cisco routers select routes with lower AD values for insertion into the active IPv4 routing table.
3
Evaluate the command syntax and routing behavior.
`ip route 192.168.50.0 255.255.255.0 10.1.1.2 100` correctly assigns an AD of 100, ensuring the route stays dormant while EIGRP is active.
If the static route AD is set lower than 90 (such as 80), it preempts EIGRP and improperly acts as the primary path.

Key Concept

Floating Static Route Administrative Distance Selection
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Topics

IPv4 Static Routing

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