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Difficulty: EasyIPv4 Static Routing

A network engineer is configuring IPv4 static routes on a Cisco IOS router. Which TWO statements accurately describe the characteristics and syntax of Cisco IPv4 static routing? (Select two.)

  1. A floating static route must be configured with an administrative distance higher than the administrative distance of the primary route.Answer
  2. Static routes configured pointing directly to a point-to-point exit interface do not require a recursive lookup to resolve the next-hop IP address.Answer
  3. C
    To configure a floating static backup route for EIGRP (AD 90), the administrator should set the static route's administrative distance to a value such as 10.
  4. D
    IPv4 static route configurations require wildcard masks rather than subnet masks to define destination networks.

Answer

The two correct statements state that a floating static route requires an administrative distance higher than the primary route, and that static routes pointing to a point-to-point exit interface bypass recursive lookup.
Floating static routes rely on having a higher administrative distance than the primary route so they stay out of the routing table until the primary route fails. Additionally, specifying a point-to-point exit interface allows direct frame transmission without a recursive next-hop lookup.

Step-by-Step Solution

1
Evaluate the administrative distance requirement for floating static routes.
Floating static routes are designed as backup routes. Routers prefer lower administrative distance (AD) values. Therefore, a floating static route must have a higher AD than the primary route to remain inactive until the primary route fails.
Lower AD indicates higher trustworthiness in Cisco IOS forwarding decisions.
2
Analyze how next-hop resolution works with point-to-point exit interfaces.
Specifying a point-to-point exit interface resolves the egress interface immediately without needing a second (recursive) lookup for a next-hop IP address.
Point-to-point links have only one destination on the link, so the router knows directly where to send frames.
3
Verify incorrect distractor statements.
Setting an AD of 10 for a backup to EIGRP (AD 90) makes the static route active immediately, overriding EIGRP instead of floating behind it. Additionally, static route syntax uses subnet masks, not wildcard masks.
Wildcard masks are syntax elements of ACLs/OSPF, not Cisco IOS 'ip route' commands.

Key Concept

IPv4 Static Route Syntax and Floating Static Route Principles
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Topics

IPv4 Static Routing

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