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Answers to Scenario 5-2: IP Subnet Design with a Class B Network 341
·
If completely bored, the telnet 199.1.1.x command could have been issued for all IP
addresses in subnets not directly connected to Fred, hoping to get a router login prompt.
That would identify the IP addresses of other router interfaces.
There is no way to know what physical media are beyond the neighboring routers. However,
because CDP claims that both routers are 2500 series routers, the possible interfaces on these
neighboring routers are limited. Figure 5-48 shows the other subnets as Ethernet segments.
Similarly, the figure shows the two neighboring routers attached to the same medium, which is
shown as a serial link in Figure 5-48.
Answers to Scenario 5-2: IP Subnet Design with a Class
B Network
Figure 5-49 shows one correct answer for the network skeleton presented in Figure 5-44.
Figure 5-49
Scenario 5-2 Diagram Scratch Pad
Answers to Task 1 for Scenario 5-2
Given the details in Figure 5-44 and Table 5-46 for Scenario 5-2, the subnet mask criteria are
as follows:
·
200 hosts in a subnet, maximum
·
100 subnets, maximum
·
Static size masks used all over this network
A
C
B
s1
s1
s1
s0
s0
s0
Subnet 172.16.4.0/23
Subnet 172.16.6.0/23
Subnet 172.16.10.0/23
Subnet 172.16.0.0/23
Subnet 172.16.8.0
/2
3
Subnet 172.16.2.0 /23
ch05.fm Page 341 Monday, March 20, 2000 5:06 PM