Chapter 6


1

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

key chain CCIE   key 1     key-string exercise4 ! interface Serial0   ip address 192.168.1.15X 255.255.255.252   ip rip authentication mode md5   ip rip authentication key-chain CCIE

5

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 CCIE   key 1     key-string exercise4     accept-lifetime 00:00:00 Oct 31 2004 00:00:00 Nov 3 2004     send-lifetime 00:00:00 Oct 31 2004 00:30:00 Nov 3 2004   key 2     key-string exercise5a     accept-lifetime 00:00:00 Nov 3 2004 duration 36000     send-lifetime 00:00:00 Nov 3 2004 duration 36000   key 3     key-string exercise5b     accept-lifetime 10:00:00 Nov 3 2004 infinite     send-lifetime 10:00:00 Nov 3 2004 infinite ! interface Serial0   ip address 192.168.1.15X 255.255.255.252   ip rip authentication mode md5   ip 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.




CCIE Professional Development Routing TCP/IP (Vol. 12005)
Routing TCP/IP, Volume 1 (2nd Edition)
ISBN: 1587052024
EAN: 2147483647
Year: 2005
Pages: 233

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