Information Technology Reference
In-Depth Information
continued
10.0.0.0/21 is subnetted, 1 subnets
C 209.165.202.128 is directly connected, FastEthernet0/0
S 10.1.16.0 is directly connected, Serial0/0/0
Note: Your version of Packet Tracer might not correctly display the routing tables. Use the routing tables shown
in Example 7-1 to answer the following questions.
Does B2 have connectivity to the web server? Why or why not?
1.
Yes, when B2 and HQ both have default routes to ISP. ISP can route back to B2 because the ping
request to the web server is sourced from 172.16.1.6, the Serial 0/0/0 interface on B2. ISP has a static
route to 172.16.0.0/29, and HQ is directly connected to 172.16.1.4/30.
Do the LANs attached to B2 have connectivity to the web server?
2.
No. Although the pings will reach the web server and ISP will route replies back to HQ, HQ does not
have routes to the 10.1.18.0/24 or 10.1.19.0/24 LAN.
Do the LANs attached to B2 have connectivity to any of the LANs on HQ, B1, or B3?
3.
No. B2 will drop pings for all those LANs because HQ is not advertising subnets of the 10.1.16.0/21
address spaces. HQ is sending B2 a route to 10.0.0.0, which B2 is ignoring because it is connected to
that classful network.
What is the main reason why connectivity fails for some locations?
4.
RIPv1 is a classful routing protocol that does not support discontiguous addressing schemes.
Configuring RIPv2
The configuration of RIPv2 is straightforward. Although the commands will be reviewed, the follow-
ing sections of the Study Guide will focus on the differences between RIPv1 and RIPv2 rather than
the details of implementing RIPv2.
RIPv2 Message Format
RIPv2 is defined in RFC 1723 . Like version 1, RIPv2 is encapsulated in a UDP segment using port
520 and can carry up to 25 routes. Fill in the missing field names for the RIPv2 message format in
Figure 7-2.
Figure 7-2
RIPv2 Message Format (Answer)
Bits
0
7
8
15
16
23
24
31
Command = 1 or 2
Address Family Identifier (2 = IP)
IP Address (Network Address)
Version = 2
Must be Zero
Route Tag
Route
Entry
Subnet Mask
Next Hop
Metric (Hops)
Multiple route entries, upto a maximum of 25.
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