# 6.4.4 Packet Tracer – Basic Route Summarization Answers

## 6.4.4 Packet Tracer – Basic Route Summarization Answers

### Topology

HQ LAN1 172.16.64.0/23
HQ LAN2 172.16.66.0/23
EAST LAN1 172.16.68.0/24
EAST LAN2 172.16.69.0/24
WEST LAN1 172.16.70.0/25
WEST LAN2 172.16.70.128/25
Link from HQ to EAST 172.16.71.4/30
Link from HQ to WEST 172.16.71.0/30
Link from HQ to ISP 172.16.71.8/30

### Learning Objectives:

• Determine summarized routes that can be used to reduce the size of routing tables.

### Scenario:

In this activity, you have been given the network shown in the topology diagram. The subnetting and address assignments have already been completed for the network segments. Determine summarized routes that can be used to reduce the number of entries in routing tables.

### Task 1: Determine the Summary Route for the HQ LANs.

#### Step 1: List the LAN1 and LAN2 of HQ in binary format.

LAN1 10101100.00010000.01000000.000000

LAN2 10101100.00010000.01000010.000000

#### Step 2: Count the number of leftmost matching bits to determine the mask for the summary path.

1. How many leftmost matching bits are present in the two networks? _ 22

2. What is the subnet mask for the summary route in decimal format?_ 255.255.252.0

#### Step 3: Copy the matching bits and then add all zeros to determine the summary network address.

1. What are the matching bits for the two networks?
_ 10101100.00010000.01000

2. Add zeros to make the rest of the network addresses in binary form.
_10101100.00010000.01000000.000000

3. What is the network address for the summary route in decimal format?
_ 172.16.64.0

### Task 2: Determine the Summary Route for the EAST LANs.

#### Step 1: List the LAN1 and LAN2 of THIS in binary format.

LAN1 _ 10101100.00010000.01000100.000000

LAN2 _ 10101100.00010000.01000101.000000

#### Step 2: Count the number of leftmost matching bits to determine the mask for the summary path.

1. How many leftmost matching bits are present in the two networks? _ 23

2. What is the subnet mask for the summary route in decimal format?
_ 255.255.254.0

#### Step 3: Copy the matching bits and then add all zeros to determine the summary network address.

1. What are the matching bits for the two networks?
_ 10101100.00010000.0100010

2. Add zeros to make the rest of the network addresses in binary form.
_10101100.00010000.01000100.000000

3. What is the network address for the summary route in decimal format?
_ 172.16.68.0

### Task 3: Determine the Summary Route for the WEST LANs.

#### Step 1: List the WEST LAN1 and LAN2 in binary format.

LAN1 _10101100.00010000.01000110.000000

LAN2 _10101100.00010000.01000110.100000

#### Step 2: Count the number of leftmost matching bits to determine the mask for the summary path.

1. How many leftmost matching bits are present in the two networks? _ 24

2. What is the subnet mask for the summary route in decimal format?
_ 255.255.255.0

#### Step 3: Copy the matching bits and then add all zeros to determine the summary network address.

1. What are the matching bits for the two networks?
_ 10101100.00010000.01000110

2. Add zeros to make the rest of the network addresses in binary form.
_10101100.00010000.01000110.000000

3. What is the network address for the summary route in decimal format?
_ 172.16.70.0

### Task 4: Determine the Summary Route for the HQ, EAST, and WEST LANs.

#### Step 1: List the summary networks for the HQ, EAST and WEST LANs in binary format.

HQ Summary Path _10101100.00010000.01000100.000000

EAST summary route _10101100.00010000.01000100.000000

WEST summary route _10101100.00010000.01000110.000000

#### Step 2: Count the number of leftmost matching bits to determine the mask for the summary path.

1. How many leftmost matching bits are present in the two networks? _22

2. What is the subnet mask for the summary route in decimal format?
_ 255.255.252.0

#### Step 3: Copy the matching bits and then add all zeros to determine the address summary network.

1. What are the matching bits for the two networks?
_ 10101100.00010000.01000110

2. Add zeros to make the rest of the network addresses in binary form.
_ 10101100.00010000.010001

3. What is the network address for the summary route in decimal format?
_10101100.00010000.01000100.000000