Observe and solve Classful addressing problem, using OSPF (CNA-02-007)

CCNA Exploration 4.0, Semester 2, "Observe and solve Classful addressing problem, using OSPF" Packet Tracer 5.0 practice file (CNA-02-007).

• CNA-02-007.pkt, (Backup Link)
• CNA-02-007-sol.pkt, (Backup Link)

I like to use OSPF because I do not have to worry about any "Classful" problem at all: there is no "Classful" function in its design and no backward compatibility burdens. No "no auto-summary" command in OSPF!

As long as OSPF is running fine, all routes would also be fine!

R2>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 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, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is not set

     10.0.0.0/24 is subnetted, 2 subnets
O       10.1.1.0 [110/65] via 172.30.2.1, 00:00:24, Serial0/0/0
O       10.2.2.0 [110/65] via 192.168.4.1, 00:00:24, Serial0/0/1
     172.30.0.0/24 is subnetted, 3 subnets
O       172.30.1.0 [110/65] via 172.30.2.1, 00:00:24, Serial0/0/0
C       172.30.2.0 is directly connected, Serial0/0/0
C       172.30.3.0 is directly connected, FastEthernet0/0
C    192.168.4.0/24 is directly connected, Serial0/0/1
O    192.168.5.0/24 [110/65] via 192.168.4.1, 00:00:24, Serial0/0/1
R2>