Learning by Doing: CISCO Certified Network ... - SCN Research

c. Click on [A] for add a VLAN (this will become VLAN #2)
d. Click on [1] for “Ethernet” type VLAN
e. Click on [S] to save and exit
f. Click on [V] for VLANs
g. Click on [A] for add a VLAN (this will become VLAN #3)
h. Click on [1] for “Ethernet” type VLAN
i. Click on [S] to save and exit
3. Now we need to assign ports to the VLAN’s:
a. Click on [E] for VLAN membership
b. Click on [V] for VLAN assignment
c. **Type in the ports to assign for the VLAN: 4-12 (I have a 24-port switch)
d. Click on [2] to assign them to VLAN #2
e. Click on [E] for VLAN membership
f. Click on [V] for VLAN assignment
g. **Type in the ports to assign for the VLAN: 13-24 (I have a 24-port
switch)
h. Click on [3] to assign them to VLAN #3
i. All done! You can exit back to the main menu.
** We typically do not want to use VLAN #1…we reserve it for network
management functions…I saved 3 ports on my 24 port switch for VLAN #1…If you
take the semester 7 “Building CISCO Switched Multi-Layered Networks” then you
will learn more about using VLAN 1…for now restrict users to VLAN #2 and above.
4. Try pinging again from workstation A to B using DOS. It should work. The
VLAN’s “electrically separate” the two networks but the router allows
communication between them.
Supplemental Lab or Challenge Activity:
1. Add a protocol inspector and observe the VLAN information. You will have to put
one on each subnet…alas a limitation of our mighty Ethereal…it only collects
information from the directly attached subnet.
2. Go to CISCO’s website and research VLAN information.
So What Have I Learned Here?
It’s ok if you are confused right now…I showed you this cool tool for saving on
resources and then wiped out any hope by adding a router. Later on you will learn about
access control lists (ACL’s) on routers…these will allow you to deny communications
between VLAN’s once again if you want…so buck up! You are coming along nicely. In
the next lab we take this design a step further by creating a partially meshed “flatswitching”
network with four switches. That’s right…we are going to lose the router and
set up redundancy between several switches and VLANs.
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