CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

30 Switching Basics and Intermediate Routing CCNA 3 Labs and Study Guide
First IP 10.0.0.0 00001010.00000000.00000000.00000000
Last IP 10.7.255.255 00001010.00000111.11111111.11111111
Summary route 10.0.0.0/13
Default and Static Routing Scenario
In Figure 1-21, both static and default routing are used between RTA and ISP to route traffic. First, determine
the summary route that would summarize all of the subnets from the 10.0.0.0 address space. Then,
record the commands that would be configured on RTA and ISP to provide full connectivity. (Hint: RTA
will use a default route and ISP will use a static route.)
Figure 1-21 Default and Static Routing Scenario
10.10.1.224/28
To find the summary route, find the common bits shared by the first and last addresses in the address
space.
First IP 10.10.1.128 00001010.00001010.00000001.10000000
Last IP 10.10.1.255 00001010.00001010.00000001.11111111
Summary route 10.10.1.128/25
10.10.1.128/26
RTA
RTC 10.10.1.244/30
RTB
Now configure ISP with a static route pointing to the summary of the address space:
ISP(config)#ip route 10.10.1.128 255.255.255.128 209.165.201.2
S1/0
209.165.201.2/30
10.10.1.248/30 10.10.1.240/30
RTA will use a default route to ISP because ISP provides connectivity to destinations outside the
10.10.1.128/25 address space:
RTA(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1
209.165.201.1/30
S0/0
DCE
10.10.1.192/27
ISP