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Difficulty: EasyIPv4 Static Routing

A network technician is adding a secondary path on Router-HQ to reach the internal subnet 172.16.40.0/24172.16.40.0/24. The primary link currently learns this destination via EIGRP with an administrative distance of 90. To ensure the secondary static path through next-hop IP 10.1.1.210.1.1.2 serves strictly as a backup when the primary link is down, which Cisco IOS command must be configured?

  1. ip route 172.16.40.0 255.255.255.0 10.1.1.2 100Answer
  2. B
    ip route 172.16.40.0 255.255.255.0 10.1.1.2 90
  3. C
    ip route 172.16.40.0 255.255.255.0 10.1.1.2 80
  4. D
    ip route 172.16.40.0 255.255.255.0 10.1.1.2 1

Answer

The command 'ip route 172.16.40.0 255.255.255.0 10.1.1.2 100' correctly configures a floating static route by specifying an administrative distance higher than the primary routing protocol.
A floating static route functions as a backup path by configuring an administrative distance (AD) higher than the primary active route's protocol. Since the primary route is learned via internal EIGRP (AD 90), assigning an AD of 100 to the static route keeps it out of the active routing table until the EIGRP path becomes unavailable.

Step-by-Step Solution

1
Identify the primary route's Administrative Distance (AD)
EIGRP internal route has an AD of 90.
Floating static routes rely on AD values to determine precedence.
2
Determine the required AD for a floating static backup route
The floating static route must have an AD strictly greater than 90 (e.g., 100).
Lower administrative distances are preferred in the IP routing table.
3
Construct the Cisco IOS static route command syntax
'ip route <destination> <mask> <next-hop> [administrative-distance]'
Applying this syntax yields 'ip route 172.16.40.0 255.255.255.0 10.1.1.2 100'.

Key Concept

Floating Static Route Administrative Distance Calibration
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Topics

IPv4 Static Routing

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