Cả hai nhà cung cấp dịch vụ Internet sẽ chỉ quảng cáo với phần còn lại của Internet. Cấu hình cho C1 nối Hoa Kỳvới ISP1 sẽ là như sau:Thực hành Ví dụ 3B: Ồ không! Điều này là bất hợp pháp, phải không? Những loại mặt nạ? (Bạn muốn nó là bất hợp pháp?)hơn.) | 62 Chapter 2 Implementation Operation Lab_A config-if ip address Lab_A config-if description Lab_A LAN Connection Lab_A config-if no shut Lab_A config-if interface serial 0 0 Lab_A config-if ip address Lab_A config-if description WAN Connection to Lab_B Lab_A config-if no shut Lab_A config-if exit Lab_A config line console 0 Lab_A config-line password todd Lab_A config-line login Lab_A config-line line aux 0 Lab_A config-line password todd Lab_A config-line login Lab_A config-line line vty 0 4 Lab_A config-line password todd Lab_A config-line login Lab_A config-line exit Lab_A config banner motd This is the Lab_A router Lab_A config-line Az Lab_A copy running-config startup-config Destination filename startup-config Enter Lab_A To view the IP routing tables created on a Cisco router use the privileged mode command show ip route. The command output follows momentarily. Notice that only the configured directly connected networks are shown in the routing table. This means the router only knows how to get to networks and . Lab_A sh 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 NSSternal 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 P -periodic downloaded static route T - traffic engineered route Configure Routing Protocols Given User Requirements 63 Gateway of last resort is not set C 24 is directly connected FastEthernet0 0 C 24 is directly connected Serial 0 0 Lab_A Did you notice the C When you see it it means that the network is directly connected. The codes for each type of connection are listed at the top of the show ip route command with their abbreviations. Lab_B Configuration It s now time to configure .