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Difficulty: EasyIPv4 Static Routing

A network administrator is reviewing IPv4 static route syntax and operational characteristics on a Cisco IOS router. Which two statements regarding Cisco IPv4 static routing are correct?

  1. A static route configured with an administrative distance higher than a primary dynamic routing protocol serves as a floating static backup route.Answer
  2. B
    To create a backup floating static route for an OSPF route with an administrative distance of 110, the static route should be assigned an administrative distance of 90.
  3. Cisco IOS static route syntax requires specifying the destination network mask using dotted-decimal format rather than a wildcard mask.Answer
  4. D
    When configuring a static route using a next-hop IP address, the IP address assigned to the local router interface must be used.

Answer

The correct statements are that configuring an administrative distance higher than the primary protocol creates a floating backup route, and that Cisco IOS static routes require dotted-decimal subnet masks.
Configuring a static route with an administrative distance higher than the primary routing protocol creates a floating static route that remains inactive until the primary route fails. Additionally, Cisco IOS 'ip route' command syntax strictly requires dotted-decimal subnet masks for prefix specification.

Step-by-Step Solution

1
Analyze static route administrative distance mechanics for floating routes.
Lower administrative distance values are preferred in the routing table. To create a backup (floating) route, its administrative distance must be set higher than the primary route source.
If set lower than the primary dynamic protocol (e.g., 90 vs 110 for OSPF), the static route will preempt the primary protocol immediately.
2
Verify Cisco IOS CLI command syntax parameters for static routing.
The correct command format is 'ip route <destination-prefix> <subnet-mask> {next-hop-ip | exit-interface} [distance]'.
Subnet masks in static routes use dotted-decimal format (e.g., 255.255.255.0), and next-hop IP addresses must belong to the neighboring router.

Key Concept

Cisco IPv4 Static Route Syntax and Floating Static Administrative Distance Calibration
Estimated Time:1m 0s
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Topics

IPv4 Static Routing

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