Examkin

Question

Difficulty: HardIPv4 Static Routing

An administrator is configuring a backup floating static route on a Cisco router for destination network 10.50.0.0/1610.50.0.0/16. The primary path to this network is currently learned via EIGRP with an administrative distance of 90. Which `ip route` command correctly implements a backup static route via next-hop IP 192.168.100.2192.168.100.2 that takes effect only if the primary EIGRP route fails?

  1. ip route 10.50.0.0 255.255.0.0 192.168.100.2 95Answer
  2. B
    ip route 10.50.0.0 255.255.0.0 192.168.100.2 85
  3. C
    ip route 10.50.0.0 0.0.255.255 192.168.100.2 95
  4. D
    ip route 10.50.0.0 255.255.0.0 192.168.100.2 90

Answer

The command 'ip route 10.50.0.0 255.255.0.0 192.168.100.2 95' correctly configures a floating static route by specifying a higher Administrative Distance (95) than EIGRP (90).
The correct option uses valid Cisco IOS static route syntax with a standard subnet mask (255.255.0.0) and assigns an administrative distance of 95. Because 95 is higher than the primary EIGRP path AD of 90, the route remains inactive in the routing table until the primary EIGRP path becomes unavailable.

Step-by-Step Solution

1
Identify the Administrative Distance (AD) of the primary dynamic routing protocol
EIGRP internal routes have a default Administrative Distance of 90.
Floating static routes must have an AD higher than the primary route's AD to remain inactive until the primary route fails.
2
Verify standard Cisco IOS IPv4 static routing CLI syntax
The correct format is 'ip route <destination-network> <subnet-mask> <next-hop-ip> [administrative-distance]'.
IPv4 static routes require dotted-decimal subnet masks rather than wildcard masks.
3
Select the command with a valid subnet mask and an AD greater than 90
An AD of 95 ensures the static route is floating and only populated in the routing table when the EIGRP route is withdrawn.
An AD of 95 is strictly greater than 90 and less than the default static route AD of 1 or backup limits.

Key Concept

Floating Static Route Administrative Distance Selection
Rate this question

Topics

IPv4 Static Routing

More questions from this topic