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Zorluk: Çok zorIPv4 Static Routing

An enterprise edge router dynamically learns the network prefix 10.50.40.0/24 from an internal switch via Internal EIGRP (Administrative Distance 90). A network administrator needs to configure a floating static backup route for this prefix using the next-hop IPv4 address 192.168.254.2 across a secondary connection. Which Cisco IOS command correctly configures the floating static route so that it remains inactive in the routing table until the primary EIGRP path fails?

  1. ip route 10.50.40.0 255.255.255.0 192.168.254.2 95Cevap
  2. B
    ip route 10.50.40.0 255.255.255.0 192.168.254.2 90
  3. C
    ip route 10.50.40.0 255.255.255.0 192.168.254.2
  4. D
    ip route 10.50.40.0 0.0.0.255 192.168.254.2 95

Cevap

ip route 10.50.40.0 255.255.255.0 192.168.254.2 95
The correct option uses standard subnet mask notation (255.255.255.0) and specifies an administrative distance of 95. Because 95 is higher than Internal EIGRP's administrative distance of 90, the router retains this static route as an inactive backup and installs it into the IPv4 routing table only if the EIGRP path becomes unavailable.

Adım Adım Çözüm

1
Determine the administrative distance of the primary route.
Internal EIGRP has a default administrative distance of 90.
Floating static routes must have an administrative distance strictly greater than the active primary routing protocol to stay hidden from the routing table during normal operation.
2
Evaluate Cisco IOS IPv4 static route syntax requirements.
The command syntax requires 'ip route <prefix> <mask> <next-hop-ip> [administrative-distance]'.
Subnet masks must be written in standard dotted-decimal notation (e.g., 255.255.255.0) rather than inverse wildcard notation.
3
Select the option with valid CLI syntax and an administrative distance higher than 90.
The command setting an administrative distance of 95 satisfies all criteria.
An administrative distance of 95 ensures the static route remains floating until the primary EIGRP route with AD 90 is withdrawn.

Anahtar Kavram

Floating Static Route Administrative Distance Selection
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Konular

IPv4 Static Routing

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