Networking Concepts Review - CCIE Routing and Switching Exam Certification Guide - page 46

If the network is in the routing table, it is assigned as the gateway of last resort. Network
192.168.1.0 is in the routing table and is assigned as the gateway of last resort (refer to
Example 2-6).

Gateway of Last Resort Set Example 2-6

router4#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR

Gateway of last resort is 10.100.1.1 to network 192.168.1.0 Gateway of last resort is 10.100.1.1 to network 192.168.1.0

10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
D 10.1.3.0/24 [90/2195456] via 10.100.1.1, 00:01:00, Serial1
S 10.0.0.0/8 [1/0] via 10.1.3.0
C 10.1.4.0/24 is directly connected, Ethernet0
C 10.100.1.0/24 is directly connected, Serial1
D* 192.168.1.0/24 [90/2297856] via 10.100.1.1, 00:01:00, Serial1

Do not confuse the ip default-network command with the ip default-gateway command. You
use the ip default-gateway command only when IP routing is disabled ( no ip routing ). Use
the ip default-gateway command when configuring an interface with an IP address and
accessing a remote TFTP server to load up configuration or IOS files. The ip default-gateway
command points to an IP address, not a network. The router when in boot mode also uses the
ip default-gateway command, when no routing processes are running.
Use the ip default-network command when IP routing is enabled. Any routing protocol can be
enabled.

NOTE

References Used
The following resources were used to create this chapter:

www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm

www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/multiacc.htm

www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/routing.htm#xtocid8