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Difficulty: MediumIPv4 Static Routing

A network administrator is configuring IPv4 static routing on router R1. Router R1 currently learns the primary route to destination network 192.168.50.0/24192.168.50.0/24 via iBGP, which has an Administrative Distance of 200. The administrator must configure two static routes:
1. A standard static route to reach network 10.100.1.0/2410.100.1.0/24 via next-hop IPv4 address 172.16.1.2172.16.1.2.
2. A backup floating static route to reach network 192.168.50.0/24192.168.50.0/24 via next-hop IPv4 address 172.16.1.2172.16.1.2 that remains inactive until the primary iBGP route fails.

Which two `ip route` commands must the administrator configure on router R1?

  1. ip route 10.100.1.0 255.255.255.0 172.16.1.2Answer
  2. ip route 192.168.50.0 255.255.255.0 172.16.1.2 210Answer
  3. C
    ip route 192.168.50.0 255.255.255.0 172.16.1.2 180
  4. D
    ip route 192.168.50.0 255.255.255.0 172.16.1.2 200

Answer

The commands 'ip route 10.100.1.0 255.255.255.0 172.16.1.2' and 'ip route 192.168.50.0 255.255.255.0 172.16.1.2 210' are correct.
The command 'ip route 10.100.1.0 255.255.255.0 172.16.1.2' is correct because it follows standard IPv4 static route syntax to direct traffic destined for network 10.100.1.0/24 to next-hop address 172.16.1.2. The command 'ip route 192.168.50.0 255.255.255.0 172.16.1.2 210' is correct because a floating static route requires an Administrative Distance higher than the primary route (iBGP AD = 200); setting the AD to 210 ensures it remains inactive until the primary route fails.

Step-by-Step Solution

1
Identify standard Cisco IOS static route syntax for network 10.100.1.0/24
ip route 10.100.1.0 255.255.255.0 172.16.1.2
Standard IPv4 static routes use the syntax 'ip route <destination-prefix> <subnet-mask> <next-hop-ip>' with a default Administrative Distance of 1.
2
Determine Administrative Distance requirement for the backup floating static route
Target Administrative Distance must be > 200
A floating static route acts as a backup only when its Administrative Distance is configured higher than the primary path's routing protocol (iBGP AD = 200).
3
Select the correct floating static route command
ip route 192.168.50.0 255.255.255.0 172.16.1.2 210
Specifying an Administrative Distance of 210 ensures the static route remains out of the routing table until the iBGP route (AD 200) is lost.

Key Concept

IPv4 Static Route Syntax and Floating Static Route Administrative Distance Selection
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Topics

IPv4 Static Routing

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