EIGRP - Routing Protocols and Concepts - page 402

Table 9-2 Addressing Table for EIGRP Study Guide Topology continued

Device Interface IP Address Subnet Mask

B1 Fa0/0 10.10.8.1 255.255.254.0

Fa0/1 10.10.10.1 255.255.254.0

S0/0/0 172.16.1.34 255.255.255.252

B2 Fa0/0 10.10.12.1 255.255.255.0

Fa0/1 10.10.13.1 255.255.255.0

S0/0/0 172.16.1.38 255.255.255.252

B3 Fa0/0 10.10.14.1 255.255.255.128

Fa0/1 10.10.14.129 255.255.255.128

S0/0/0 172.16.1.42 255.255.255.252

ISP Fa0/0 209.165.202.129 255.255.255.252

S0/0/0 209.165.201.1 255.255.255.252

Web Server NIC 209.165.202.130 255.255.255.252

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 requirement and work your way to the
smallest host requirement. Starting with the LAN subnets, answer the following questions.

For HQ, begin with the 10.10.0.0 address as the subnet for FastEthernet 0/0. What subnet mask would
you use to provide enough space for 1000 users while maximizing the number of subnets?

255.255.252.0 or /22

Starting with 10.10.0.0, contiguously assign subnets to the LANs on HQ. List the subnets here.

LAN Subnet Address/CIDR

HQ LAN1 10.10.0.0/22

HQ LAN2 10.10.4.0/22

For B1, begin with 10.10.8.0 as the subnet for FastEthernet 0/0. What subnet mask would you use to
provide enough space 500 users while maximizing the number of subnets?

255.255.254.0 or /23

Starting with 10.10.8.0, contiguously assign subnets to the LANs on B1. List the subnets here.

LAN Subnet Address/CIDR

B1 LAN1 10.10.8.0/23

B1 LANs 10.10.10.0/23