Examkin

Soru

Zorluk: OrtaIPv4 Static Routing

Router R1 learns routes to the remote destination subnet 172.16.50.0/24172.16.50.0/24 via OSPF, which operates with a administrative distance of 110. A network administrator wants to manually configure a backup floating static route toward 172.16.50.0/24172.16.50.0/24 using next-hop IP address 192.168.12.2192.168.12.2. This backup route must remain inactive in the routing table unless the primary OSPF route fails. Which command must be configured on router R1?

  1. ip route 172.16.50.0 255.255.255.0 192.168.12.2 120Cevap
  2. B
    ip route 172.16.50.0 255.255.255.0 192.168.12.2 100
  3. C
    ip route 172.16.50.0 255.255.255.0 192.168.12.2 110
  4. D
    ip route 172.16.50.0 255.255.255.0 192.168.12.2

Cevap

The command 'ip route 172.16.50.0 255.255.255.0 192.168.12.2 120' correctly configures the floating static route with an administrative distance higher than OSPF.
A floating static route requires an Administrative Distance higher than that of the primary routing protocol. Since OSPF has an AD of 110, setting the static route AD to 120 ensures it will only be installed in the routing table if the OSPF route disappears.

Adım Adım Çözüm

1
Identify the primary dynamic routing protocol and its administrative distance (AD).
OSPF is the primary routing protocol with an AD of 110.
Floating static routes rely on Administrative Distance ranking to remain inactive until primary routes fail.
2
Determine the required AD for the floating static backup route.
The AD of the static route must be configured to a value strictly greater than 110 (such as 120).
Cisco IOS router forwarding logic installs routes with lower AD values into the IP routing table first.
3
Validate Cisco IOS static route syntax including destination, mask, next-hop IP, and AD.
'ip route 172.16.50.0 255.255.255.0 192.168.12.2 120' fulfills all parameters accurately.
The AD parameter is appended at the end of the 'ip route' command string.

Anahtar Kavram

Floating Static Route Administrative Distance Configuration
Bu soruyu puanla

Konular

IPv4 Static Routing

Bu konudan daha fazla soru