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Zorluk: KolayIPv4 Static Routing

A router receives routes for the destination network 10.20.0.0/16 dynamically from OSPF, which uses a default administrative distance of 110. A network administrator needs to create a backup static route for this network using the next-hop address 192.168.1.2 so that it only becomes active if the primary OSPF path fails. Which Cisco IOS command correctly configures this floating static route?

  1. ip route 10.20.0.0 255.255.0.0 192.168.1.2 120Cevap
  2. B
    ip route 10.20.0.0 255.255.0.0 192.168.1.2 90
  3. C
    ip route 10.20.0.0 255.255.0.0 192.168.1.2 110
  4. D
    ip route 10.20.0.0 0.0.255.255 192.168.1.2 120

Cevap

The command 'ip route 10.20.0.0 255.255.0.0 192.168.1.2 120' correctly configures the floating static route.
The correct command uses standard Cisco IOS syntax with destination network 10.20.0.0, subnet mask 255.255.0.0 for /16, next-hop address 192.168.1.2, and an administrative distance of 120. Because 120 is greater than OSPF's default AD of 110, the static route remains inactive in the routing table until the primary OSPF route fails.

Adım Adım Çözüm

1
Identify the required static route components in Cisco IOS syntax
Syntax format: ip route <destination-network> <subnet-mask> <next-hop-ip> [administrative-distance]
Cisco IOS requires exact keyword ordering and standard dotted-decimal subnet masks.
2
Convert the /16 prefix length to a dotted-decimal subnet mask
/16 equals 255.255.0.0
IPv4 static routing commands require a subnet mask, not a wildcard mask.
3
Determine the required Administrative Distance (AD) for a floating static route
The AD must be higher than the primary routing protocol's AD (OSPF = 110), so an AD of 120 is chosen
Floating static routes are kept out of the routing table until the primary route with a lower AD becomes unavailable.

Anahtar Kavram

Floating static route configuration requires an administrative distance higher than the primary dynamic routing protocol.
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Konular

IPv4 Static Routing

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