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Zorluk: OrtaIPv4 Static Routing

A network administrator needs to configure a backup floating static route on router R1 to reach the internal subnetwork 172.16.50.0/24172.16.50.0/24. The primary route to this destination is learned via OSPF, which operates with its default administrative distance. Which command must be configured on R1 so that the static route remains inactive until the primary OSPF path fails?

  1. ip route 172.16.50.0 255.255.255.0 192.168.12.2 120Cevap
  2. B
    ip route 172.16.50.0 255.255.255.0 192.168.12.2 110
  3. C
    ip route 172.16.50.0 255.255.255.0 192.168.12.2 90
  4. D
    ip route 172.16.50.0 0.0.0.255 192.168.12.2 120

Cevap

ip route 172.16.50.0 255.255.255.0 192.168.12.2 120
OSPF routes have a default administrative distance of 110. A floating static route acts as a backup path by specifying an administrative distance higher than the primary path (in this case, 120). Cisco IOS uses the format 'ip route destination mask next-hop distance', making 'ip route 172.16.50.0 255.255.255.0 192.168.12.2 120' correct.

Adım Adım Çözüm

1
Determine the administrative distance (AD) of the primary routing protocol
OSPF has a default administrative distance of 110.
Floating static routes rely on administrative distance values to determine path selection priority.
2
Select an administrative distance value for the backup static route
The backup static route must have an AD greater than 110 (such as 120).
Routers prefer routes with lower administrative distance values. The static route will only be installed into the routing table if the lower-AD OSPF route becomes unavailable.
3
Verify Cisco IOS static route command syntax
The correct command syntax is 'ip route <destination-prefix> <subnet-mask> <next-hop-ip> [distance]'.
Subnet masks must be entered in standard dotted-decimal format rather than wildcard mask notation.

Anahtar Kavram

Floating Static Route Administrative Distance Configuration
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Konular

IPv4 Static Routing

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