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Difficulty: MediumIPv4 Static Routing

A network administrator needs to configure a fully specified IPv4 static route on a Cisco router to reach destination subnet 10.50.0.0/1610.50.0.0/16. The next-hop router interface IP address is 172.16.1.2172.16.1.2, and the outbound multiaccess Ethernet interface on the local router is GigabitEthernet0/0. Which command correctly establishes this route while avoiding recursive routing table lookups?

  1. ip route 10.50.0.0 255.255.0.0 GigabitEthernet0/0 172.16.1.2Answer
  2. B
    ip route 10.50.0.0 0.0.255.255 GigabitEthernet0/0 172.16.1.2
  3. C
    ip route 10.50.0.0 255.255.0.0 172.16.1.2 GigabitEthernet0/0
  4. D
    ip route 10.50.0.0 255.255.0.0 GigabitEthernet0/0 172.16.1.1

Answer

The command `ip route 10.50.0.0 255.255.0.0 GigabitEthernet0/0 172.16.1.2` correctly configures a fully specified static route.
A fully specified static route on a broadcast multiaccess interface requires both the local outbound interface name and the next-hop IP address. In Cisco IOS, the command structure is `ip route <prefix> <mask> <exit-interface> <next-hop-ip>`. The option specifying `ip route 10.50.0.0 255.255.0.0 GigabitEthernet0/0 172.16.1.2` adheres strictly to this syntax.

Step-by-Step Solution

1
Identify the target network address and subnet mask.
Destination prefix is 10.50.0.010.50.0.0 with mask 255.255.0.0255.255.0.0 (/16).
Cisco IOS IPv4 static route syntax requires the destination prefix followed by its subnet mask in dotted-decimal format.
2
Apply Cisco IOS fully specified static route syntax rules.
The correct parameter order after prefix and mask is the exit interface followed by the next-hop IP address.
Specifying both parameters explicitly prevents ARP resolution issues on multiaccess Ethernet segments and eliminates recursive lookup overhead.
3
Verify parameter placement and values.
Interface GigabitEthernet0/0 precedes next-hop IP 172.16.1.2172.16.1.2.
The next-hop must belong to the adjacent downstream router, not the local router.

Key Concept

Fully Specified IPv4 Static Route Syntax
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Topics

IPv4 Static Routing

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