Packet Tracer – Investigating a VLAN
Implementation
Please click here to download topology 3.1.2.7 Packet Tracer - Investigating a VLAN Implementation Instructions
Topology
 |
| 3.1.2.7 Packet Tracer - Investigating a VLAN Implementation Instructions |
Addressing Table
|
Device
|
Interface
|
IP Address
|
Subnet Mask
|
Default Gateway
|
|
S1
|
VLAN
99
|
172.17.99.31
|
255.255.255.0
|
N/A
|
|
S2
|
VLAN
99
|
172.17.99.32
|
255.255.255.0
|
N/A
|
|
S3
|
VLAN
99
|
172.17.99.33
|
255.255.255.0
|
N/A
|
|
PC1
|
NIC
|
172.17.10.21
|
255.255.255.0
|
172.17.10.1
|
|
PC2
|
NIC
|
172.17.20.22
|
255.255.255.0
|
172.17.20.1
|
|
PC3
|
NIC
|
172.17.30.23
|
255.255.255.0
|
172.17.30.1
|
|
PC4
|
NIC
|
172.17.10.24
|
255.255.255.0
|
172.17.10.1
|
|
PC5
|
NIC
|
172.17.20.25
|
255.255.255.0
|
172.17.20.1
|
|
PC6
|
NIC
|
172.17.30.26
|
255.255.255.0
|
172.17.30.1
|
|
PC7
|
NIC
|
172.17.10.27
|
255.255.255.0
|
172.17.10.1
|
|
PC8
|
NIC
|
172.17.20.28
|
255.255.255.0
|
172.17.20.1
|
|
PC9
|
NIC
|
172.17.30.29
|
255.255.255.0
|
172.17.30.1
|
Objectives
Part 1: Observe Broadcast Traffic in
a VLAN Implementation
Part 2: Observe Broadcast Traffic
without VLANs
Part 3: Complete Reflection Questions
Background
In this activity, you will observe how
broadcast traffic is forwarded by the switches when VLANs are configured and
when VLANs are not configured.
Part 1: Observe Broadcast Traffic in a VLAN Implementation
Step 1:
Ping from PC1 to PC6.
a.
Wait for all the link lights to
turn to green. To accelerate this process, click Fast Forward Time located in the bottom yellow tool bar.
b.
Click the Simulation tab and use the Add
Simple PDU tool. Click on PC1,
and then click on PC6.
c.
Click the Capture/Forward button to step through the process. Observe the ARP
requests as they traverse the network. When the Buffer Full window appears,
click the View Previous Events button.
d.
Were the pings successful? Why?
____________________________________________________________________________________
____________________________________________________________________________________
e.
Look at the Simulation Panel,
where did S3 send the packet after
receiving it?
____________________________________________________________________________________
In normal operation, when a switch
receives a broadcast frame on one of its ports, it forwards the frame out all
other ports. Notice that S2 only
sends the ARP request out Fa0/1 to S1.
Also notice that S3 only sends the
ARP request out F0/11 to PC4. PC1 and PC4 both belong to VLAN 10. PC6
belongs to VLAN 30. Because broadcast traffic is contained within the VLAN, PC6 never receives the ARP request from
PC1. Because PC4 is not the destination, it discards the ARP request. The ping
from PC1 fails because PC1 never receives an ARP reply.
Step 2:
Ping from PC1 to PC4.
a.
Click the New button under the Scenario 0 dropdown tab. Now click on the Add Simple PDU icon on the right side
of Packet Tracer and ping from PC1
to PC4.
b.
Click the Capture/Forward button to step through the process. Observe the ARP
requests as they traverse the network. When the Buffer Full window appears,
click the View Previous Events
button.
c.
Were the pings
successful? Why?
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
d.
Examine the Simulation Panel.
When the packet reached S1, why does
it also forward the packet to PC7?
____________________________________________________________________________________
____________________________________________________________________________________
Part 2: Observe Broadcasts Traffic without VLANs
Step 1:
Clear the configurations on all
three switches and delete the VLAN database.
a.
Return to Realtime mode.
b.
Delete the startup
configuration on all 3 switches. What command is used to delete the startup configuration
of the switches? ___________________________________________________________
c.
Where is the VLAN file stored in
the switches? ______________________________________________
d.
Delete the VLAN file on all 3
switches. What command deletes the VLAN file stored in the switches?
____________________________________________________________________________________
Step 2:
Reload the switches.
Use the reload command in privileged EXEC mode to reset all the switches.
Wait for the entire link to turn green. To accelerate this process, click Fast Forward Time located in the bottom
yellow tool bar.
Step 3:
Click Capture/Forward to send
ARP requests and pings.
a.
After the switches reload and
the link lights return to green, the network is ready to forward your ARP and
ping traffic.
b.
Select Scenario 0 from the drop down tab to return to Scenario 0.
c.
From Simulation mode, click the Capture/Forward
button to step through the process. Notice that the switches now forward the
ARP requests out all ports, except the port on which the ARP request was
received. This default action of switches is why VLANs can improve network
performance. Broadcast traffic is contained within each VLAN. When the Buffer Full window appears, click the View Previous Events button.
Part 3: Complete Reflection Questions
1. If a PC in VLAN 10 sends a broadcast message, which devices receive
it?
____________________________________________________________________________________
2. If a PC in VLAN 20 sends a broadcast message, which devices receive it?
____________________________________________________________________________________
3. If a PC in VLAN 30 sends a broadcast message, which devices receive it?
____________________________________________________________________________________
4. What happens to a frame sent from a PC in VLAN 10 to a PC in VLAN
30?
____________________________________________________________________________________
5. In terms of ports, what are the collision domains on the switch?
____________________________________________________________________________________
6. In terms of ports, what are the broadcast domains on the switch?
____________________________________________________________________________________
Suggested Scoring Rubric
|
Activity Section
|
Question Location
|
Possible Points
|
Earned Points
|
|
Part
1: Observe Broadcast Traffic in a VLAN Implementation
|
Step 1d
|
6
|
|
|
Step 1e
|
5
|
|
|
|
Step 2c
|
6
|
|
|
|
Step 2d
|
5
|
|
|
|
Part 1 Total
|
22
|
|
|
|
Part
2: Observe Broadcast Traffic without VLANs
|
Step 1b
|
6
|
|
|
Step 1c
|
6
|
|
|
|
Step 1d
|
6
|
|
|
|
Part 2 Total
|
18
|
|
|
|
Part
3: Complete Reflection Questions
|
1
|
10
|
|
|
2
|
10
|
|
|
|
3
|
10
|
|
|
|
4
|
10
|
|
|
|
5
|
10
|
|
|
|
6
|
10
|
|
|
|
Part 3 Total
|
60
|
|
|
|
Total Score
|
100
|
|
|
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