Examkin

Question

Difficulty: EasyIPv4 Static Routing

A network administrator needs to configure a floating static default route on a Cisco IOS router to serve as a backup path to a primary default route learned via OSPF. Which two statements accurately describe the requirements for this configuration? (Select TWO)

  1. The static route command must specify a destination network of 0.0.0.00.0.0.0 and a subnet mask of 0.0.0.00.0.0.0.Answer
  2. The administrative distance configured for the backup static route must be greater than 110110.Answer
  3. C
    The administrative distance configured for the backup static route must be set to 11 to guarantee priority.
  4. D
    The destination subnet mask must be set to 255.255.255.255255.255.255.255 to match all IPv4 traffic.

Answer

To configure a floating static default route as a backup to an OSPF route, the destination address and mask must be configured as 0.0.0.0 0.0.0.0, and the administrative distance must be configured to a value greater than 110.
A static default route requires the destination network 0.0.0.00.0.0.0 and mask 0.0.0.00.0.0.0. To make this static route function as a backup (floating route) to an OSPF-learned route, its administrative distance must be higher than OSPF's default AD of 110110.

Step-by-Step Solution

1
Identify the destination prefix and mask for a default static route.
A default route matches all traffic using the IPv4 prefix 0.0.0.0 and subnet mask 0.0.0.0.
The default static route syntax requires 'ip route 0.0.0.0 0.0.0.0 {ip-address | exit-interface}'.
2
Determine the required Administrative Distance (AD) for a floating backup route.
Since OSPF has a default AD of 110, the static route AD must be set to 111 or higher.
Cisco routers prefer routes with lower AD values. To ensure the static route is used only when the OSPF route fails, its AD must be higher than the OSPF AD.

Key Concept

IPv4 Floating Static Default Route Requirements
Rate this question

Topics

IPv4 Static Routing

More questions from this topic