只要你的路由器没有配置缺省路由，即默认路由，show ip route 的结果，最上方就会出现Gateway of last resort is not set。你可以配置一条缺省路由 ip route 0.0.0.0 0.0.0.0 ip-addr之后，再show ip route，可以看到这名话变成你的默认路由。
2. A user is attempting to do an http://www.cisco.com/ without success. Which two configuration values must be set on the host to allow this access? (Choose two.) a. WINS server b. HTTP server c. Netbios d. DNS server e. default gateway ...