The statement neighbor 172.25.150.206 can be added to Taos's RIP configuration, causing Taos to unicast RIP updates to that address. This approach works only if Pojoaque's RIPv1 process complies with the rule that the unused fields of RIP messages with version numbers higher than 1 will be ignored and the rest of the packet processed.
2
Begin by calculating the subnets with the highest number of hosts. From the unused subnet bits, calculate the subnet(s) with the next-highest number of hosts, and so on. Remember that as a group of bits are used for a subnet, no subsequent subnet can begin with that same bit combination. For example, if the first subnet begins with 00, all subsequent subnets must begin with 01, 10, or 11. If the second subnet begins with 010, no subsequent subnet can begin with 010.
One solution (with the subnet bits shaded) is
00000000
192.168.100.0/26 (62 hosts)
01000000
192.168.100.64/27 (30 hosts)
01100000
192.168.100.96/28 (14 hosts)
01110000
192.168.100.112/28 (14 hosts)
10000000
192.168.100.128/28 (14 hosts)
10010000
192.168.100.144/28 (14 hosts)
10100000
192.168.100.160/28 (14 hosts)
10110000
192.168.100.176/29 (8 hosts)
10111000
192.168.100.184/29 (8 hosts)
11000000
192.168.100.192/29 (8 hosts)
11001000
192.168.100.200/29 (8 hosts)
11010000
192.168.100.208/29 (8 hosts)
11011000
192.168.100.216/30 (2 hosts)
11011100
192.168.100.220/30 (2 hosts)
11100000
192.168.100.224/30 (2 hosts)
11100100
192.168.100.228/30 (2 hosts)
11101000
192.168.100.232/30 (2 hosts)
11101100
192.168.100.236/30 (2 hosts)
11110000
192.168.100.240/30 (2 hosts)
11110100
192.168.100.244/30 (2 hosts)
11111000
192.168.100.248/30 (2 hosts)
11111100
192.168.100.252/30 (2 hosts)
3
RTA, RTB, and RTD have the statement version 2 in their RIP configurations. Additionally, the RIP configurations of RTA and RTB include the statement no auto-summary. The interfaces of RTA and RTB connected to subnet 192.168.2.64/28 have the statements ip rip send version 1 2 and ip rip receive version 1 2. The interface of RTD connected to subnet 192.168.2.128/28 has the statements ip rip send version 1 and ip rip receive version 1.
4
The following solution uses a key chain name of CCIE and a key string named exercise4 on RTB and RTD. Assuming both routers' interfaces are S0, the configuration of both RTB and RTD is
The configuration here assumes that the authentication key in Configuration Exercise 4 was enabled on October 31, 2004, at midnight. The second key string used here is exercise5a, and the third key string is exercise5b:
key chain CCIEkey 1key-string exercise4accept-lifetime 00:00:00 Oct 31 2004 00:00:00 Nov 3 2004send-lifetime 00:00:00 Oct 31 2004 00:30:00 Nov 3 2004key 2key-string exercise5aaccept-lifetime 00:00:00 Nov 3 2004 duration 36000send-lifetime 00:00:00 Nov 3 2004 duration 36000key 3key-string exercise5baccept-lifetime 10:00:00 Nov 3 2004 infinitesend-lifetime 10:00:00 Nov 3 2004 infinite!interface Serial0ip address 192.168.1.15X 255.255.255.252ip rip authentication mode md5ip rip authentication key-chain CCIE
6
Globally configure ipv6 unicast-routing. Configure the IPv6 addresses on the LAN ports. 2001:DB8:0:2::/64 is configured on the LAN shared between RTA and RTB. Configure a RIPng routing process on all IPv6 addressed interfaces.