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CCNP R&S Question of the Week: Gateway of Last Resort

By Johnny Bass
March 20, 2015

ccnpQoW03Refer to the exhibit below. Why is the 140.140.0.0 network not used as the gateway of last resort even though it is configured first? Select the best response.

R3#show run | include default
 ip default-network 140.140.0.0
 ip default-network 130.130.0.0
R3#show ip route | begin Gateway
 Gateway of last resort is 0.0.0.0 to network 130.130.0.0
 116.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
 C 116.16.37.0/30 is directly connected, Serial1/0.2
 C 116.16.32.0/30 is directly connected, Serial2/0.2
 C 116.16.34.0/28 is directly connected, Serial1/0.1
 C 116.16.35.0/28 is directly connected, Serial2/0.1
 S 116.0.0.0/8 [1/0] via 116.16.34.0
 * 140.140.0.0/32 is subnetted, 3 subnets
 O 140.140.1.1 [110/65] via 116.16.34.4, 00:14:54, Serial1/0.1
 O 140.140.3.1 [110/65] via 116.16.34.4, 00:14:54, Serial1/0.1
 O 140.140.2.1 [110/65] via 116.16.34.4, 00:14:54, Serial1/0.1
 * 130.130.0.0/16 is variably subnetted, 4 subnets, 2 masks
 D* 130.130.0.0/16 is a summary, 00:30:04, Null0
 C 130.130.1.0/24 is directly connected, Ethernet0/0
 C 130.130.2.0/24 is directly connected, Ethernet0/1
 C 130.130.3.0/24 is directly connected, Ethernet1/0
 D 150.150.0.0/16 [90/679936] via 116.16.35.5, 00:02:58, Serial2/0.1

 

A. Default-network selection will always prefer the statement with the lowest IP address.
B. The last default-network statement will always be preferred.
C. A route to the 140.140.0.0 network does not exist in the routing table
D. A router will load balance across multiple default-networks; repeatedly issuing the show ip route command would show the gateway of last resort changing between the two networks.

Reveal Answer

Answer: C.

The IP Default Network command requires that there is a route to the classful network in the local routing table, a subnet isn’t substantial. So in this case it will be ignored as the default since the 140.40.0.0/16 is not in the routing table.

Related Resources
Cisco White Papers

Related Course
CCNP Routing and Switching e-Camp

 

In this article
  • CCNP
  • Certification
  • Cisco
  • Routing & Switching
  • ccnp certification
  • CCNP R&S
  • exam prep

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