Chapter1 : Lab 1.4.3 Monitoring VLAN Traffic

Task 1: Demonstrate Broadcasts across a Single LAN

Step 1: Prepare the switch for configuration

a. Referring to the topology diagram, connect the console (or rollover) cable to the console port on the
switch and the other cable end to the host computer with a DB-9 or DB-25 adapter to the COM 1 port.
Ensure that power has been applied to both the host computer and switch.
b. Establish a HyperTerminal, or other terminal emulation program, connection from PC1 to the switch.
c. Ensure that the switch is ready for lab configuration by verifying that all existing VLAN and general
configurations are removed.
1) Remove the switch startup configuration file from NVRAM.
Switch#erase startup-config
Erasing the nvram filesystem will remove all files! Continue? [confirm]
2) Press Enter to confirm.
The response should be:
Erase of nvram: complete
Step 2: Configure the PCs
a. Connect the two PCs to the switch as shown in the topology diagram.
b. Configure the two PCs to have the IP addresses and subnet mask shown in the topology table.
c. Clear the ARP cache on each PC by issuing the arp -d command at the PC command prompt.
d. Confirm that the ARP cache is clear by issuing the arp -a command.


Step 3: Generate and examine ARP broadcasts
a. Launch Wireshark on each PC and start the packet capture for the traffic seen by the NIC in each PC.
b. From the command line of each PC, ping all connected devices.
c. Monitor the operation of Wireshark. Note the ARP traffic registering on each PC.
d. Stop the Wireshark capture on each PC.
e. Examine the entries in the Wireshark Packet List (upper) Pane.
How many ARP captures occurred for each device?
ARP mengirim permintaan dan menbalas request uuntuk masing-masing perangkat yang di-ping

List the source IP addresses of the ARP request and replies:
Alamat IP asal adalah perangkat yang menerbitkan ping commans dan mereply dari perangkat yang sedang di-ping

Did each device receive an ARP request from every PC connected to the switch?
Ya

f. Exit Wireshark
Task 2: Demonstrate Broadcasts within Multiple VLANs

Step 1: Configure the VLANs on the switch
a. Using the established console session from PC1 to the switch, set the hostname by issuing the
following command from the global configuration mode:
Switch(config)# hostname FC-ASW-1
b. Set interfaces Fa0/1 and Fa0/2 to VLAN 10 by issuing the following commands from the global
configuration and interface configuration modes:
FC_ASW-1(config)#interface FastEthernet0/1
FC_ASW-1(config-if)#switchport access vlan 10
% Access VLAN does not exist. Creating vlan 10
FC_ASW-1(config-if)#interface FastEthernet0/2
FC_ASW-1(config-if)#switchport access vlan 10
c. Set interfaces Fa0/3 and Fa0/4 to VLAN 20 by issuing the following commands from the interface
configuration mode:
FC_ASW-1(config-if)#interface FastEthernet0/3
FC_ASW-1(config-if)#switchport access vlan 20
% Access VLAN does not exist. Creating vlan 20
FC_ASW-1(config-if)#interface FastEthernet0/4
FC_ASW-1(config-if)#switchport access vlan 20
FC_ASW-1(config-if)#end
d. Confirm that the interfaces are assigned to the current VLANs by issuing the show vlan command
from the Privileged EXEC mode. If the VLANs are not assigned correctly, troubleshoot the command
entries shown in Steps 1b and 1c and reconfigure the switch.

Step 2: Prepare the PCs
a. Clear ARP cache on each PC by issuing the arp -d command at the PC command prompt.
b. Confirm the ARP cache is clear by issuing the arp -a command.

Step 3: Generate ARP broadcasts
a. Launch Wireshark on each PC and start the packet capture for the traffic seen by the NIC in each PC.
b. From the command line of each PC, ping each of the other three devices connected to the switch.
c. Monitor the operation of Wireshark. Note the ARP traffic registering on the two PCs.
d. Stop the Wireshark capture on each PC.
e. Examine the entries in the Wireshark Packet List (upper) Pane.

How many ARP captures occurred for each PC?
Satu ARP merequest dan satu ARP mereply perangkat VLAN pada komputer

List the source IP addresses:
Tergantung pada PC masing-masing

What is the difference between the captured ARP packets for each PC this time and those captured
in Task 1?
Hanya permintaan ARP yang diterima dari perangkat pada VLAN yang sama.

How many Ethernet broadcast domains are present now?
2 broadcast termasuk VLAN 10 dan VLAN 20.

f. Exit Wireshark.

Step 4: Clean up
Erase the configuration and reload the switch. Disconnect and store the cabling. For PC hosts that are
normally connected to other networks (such as the school LAN or to the Internet), reconnect the appropriate
cabling and restore the TCP/IP settings.
Task 3: Reflection
a. Discuss the use of VLANS in keeping data traffic separated. What are the advantages of doing this?
- mengurani tekanan pada bandwidth dengan membatasi broadcast hanya pada host pada VLAN
- menyediakan keamanan dan penyaringan trafik dengan membatasi akses pengguna pada satu VLAN
b. When designing a network list different criteria that could be used to divide a network into VLANs.
- basis lokasi
- organisasi
- tipe trafik