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Zorluk: OrtaIPv4 Static Routing

Router R3 currently populates its routing table with a primary route to the 172.16.40.0/24172.16.40.0/24 network via OSPF, which carries a default administrative distance of 110110. A network administrator wants to implement a backup path to 172.16.40.0/24172.16.40.0/24 using the next-hop IPv4 address 10.2.2.210.2.2.2. The backup route must remain inactive in the routing table unless the primary OSPF path becomes unavailable. Which command should be entered on router R3 to accomplish this objective?

  1. ip route 172.16.40.0 255.255.255.0 10.2.2.2 130Cevap
  2. B
    ip route 172.16.40.0 255.255.255.0 10.2.2.2 90
  3. C
    ip route 172.16.40.0 0.0.0.255 10.2.2.2 130
  4. D
    ip route 10.2.2.2 255.255.255.0 172.16.40.0 130

Cevap

The command `ip route 172.16.40.0 255.255.255.0 10.2.2.2 130` correctly configures a floating static route with an administrative distance higher than OSPF (110).
A floating static route is an administrative backup route configured with a higher Administrative Distance (AD) than the primary routing protocol. Since OSPF has an AD of 110110, configuring the static route with an AD of 130130 ensures it is ignored during normal operation. If the OSPF route disappears from the routing table, the static route with AD 130130 takes over forwarding.

Adım Adım Çözüm

1
Identify the destination network, subnet mask, and next-hop IP address.
Destination: 172.16.40.0, Mask: 255.255.255.0, Next-hop IP: 10.2.2.2.
Cisco IOS static route syntax requires `ip route <prefix> <mask> <next-hop|exit-interface> [distance]`.
2
Determine the administrative distance (AD) of the primary protocol and choose a higher AD for the floating static route.
Primary OSPF AD is 110; the backup route AD must be greater than 110 (e.g., 130).
Routes with lower AD values are preferred. A higher AD ensures the static route remains floating (inactive) until the primary OSPF route fails.
3
Assemble the complete Cisco IOS CLI command string.
`ip route 172.16.40.0 255.255.255.0 10.2.2.2 130`.
This matches all parameter requirements and syntax rules.

Anahtar Kavram

Floating Static Route Administrative Distance Configuration
Tahmini Süre:1m 15s
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Konular

IPv4 Static Routing

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