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。
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e. default gateway de 3. Which two statements are correct in a comparison of IPv4 and IPv6 packet headers? (Choose two.) a. The Source Address field name from IPv4 is kept in IPv6. b. The Version field from IPv4 is not kept in IPv6. ...