Refer to the exhibit. The route for 10.227.150.160/27 has been very unstable. The same route has four backups to routers A, B, C, and D via the respective methods. The routing protocol defaults for ro

Question

Exhibits

Options

• Arouter B
• Brouter D
• Crouter C
• Drouter A

• A
  67% (16)
• B
  4% (1)
• C
  17% (4)
• D
  13% (3)

Explanation

To determine which router Router Y will use as a backup to route traffic to 10.227.150.160/27, we need to compare the administrative distances (AD) of the various routing methods that connect to routers A, B, C, and D. Routing Protocol Administrative Distances: OSPF (Router A): Default AD is 110. Static Route with an AD of 105 (Router B): The AD has been set to 105, making it lower than External EIGRP (Router C): Default AD for external EIGRP is 170. iBGP (Router D): Default AD is 200. The current route to 10.227.150.160/27 is through BGP (as shown by the 'B' in the routing table) via 10.224.1.3 with an AD of 20. This means that when this BGP route becomes unavailable, Router Y will select the next route based on the lowest AD. Backup Route Selection: Router B (Static Route): AD is 105. Router A (OSPF): AD is 110. Router C (External EIGRP): AD is 170. Router D (iBGP): AD is 200. The static route via Router B has the lowest administrative distance (AD of 105) among the available backups. Therefore, when the BGP route becomes unavailable, Router Y will use the static route via Router B to reach 10.227.150.160/27.

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