Information Technology Reference
In-Depth Information
Study Guide
RIPv1 Limitations
The main limitation of RIPv1 is that it is a classful routing protocol. As you know, classful routing
protocols do not include the subnet mask with the network address in routing updates. This can cause
problems with discontiguous subnets or networks that use variable-length subnet masking (VLSM). In
the following sections of the Study Guide, you will design a discontiguous addressing scheme and
answer questions related to its implementation.
Documenting the Addressing Scheme
Refer to the topology shown in Figure 7-1. Using the 10.1.16.0/21 address space for LANs and the
172.16.1.0/28 address space for WANs, you will design an appropriate addressing scheme.
Figure 7-1
RIPv2 Study Guide Topology (Answer)
10.1.22.0/24
10.1.23.0/25
150 Hosts
90 Hosts
Address Space
LANs: 10.1.16.0/21
WANs: 172.16.1.0/28
LAN1
LAN2
172.16.1.0/30
LAN1
150 Hosts
10.1.16.0/24
Fa0/0
209.165.201.0/30
209.165.202.128/30
Fa0/0
Fa0/1
S0/0/1
Fa0/0
S0/0/0
S0/0/0
B1
HQ
ISP
S0/0/0
S0/1/0
Fa0/1
S0/1/1
Web
Server
LAN2
172.16.1.4/30
172.16.1.8/30
150 Hosts
10.1.17.0/24
S0/0/0
S0/0/0
Fa0/0
Fa0/1
LAN1
LAN2
B2
B3
150 Hosts
150 Hosts
10.1.21.0/24
Fa0/1
Fa0/0
10.1.18.0/24
LAN2
LAN1
150 Hosts
10.1.19.0/24
150 Hosts
10.1.20.0/24
LAN Subnets
To begin your design, you will need to determine the subnets that you will use. To use the available
address space most efficiently, start with your largest host requirements and work sequentially to the
smallest host requirement. Starting with the LAN subnets, answer the following questions and fill in
the subnets in Table 7-1.
