VLSM Example 1
A
B
C
D
Objective
Create an addressing scheme using variable length subnet masking (VLSM).
Scenario
The assignment is the Class C address 192.168.10.0 and it must support the network shown
in the diagram. The use of IP unnumbered or NAT is not permitted on this network. Create an
addressing scheme that meets the requirements shown in the diagram.
Step 1
1. How many host are on the largest LAN? ________________________________________
2. How many bits need to be borrowed in order to satisfy the needs of the largest LAN?
_________________________________________________________________________
Step 2
Subnet the network address 192.168.10.0 according the largest LAN.
Step 3
Use VLSM to further subnet the addresses to best fit the needs of the other LANs and WAN links.
1. What is the network address and subnet mask for the Ethernet network attached to router A?
_________________________________________________________________________
2. What is the network address and subnet mask for the Ethernet network attached to router B?
_________________________________________________________________________
3. What is the network address and subnet mask for the Ethernet network attached to router C?
_________________________________________________________________________
106758278
4. What is the network address and subnet mask for the Ethernet network attached to router D?
_________________________________________________________________________
5. What is the network address and subnet mask for the WAN link between router A and router
B? ______________________________________________________________________
6. What is the network address and subnet mask for the WAN link between router A and router
C? ______________________________________________________________________
7. What is the network address and subnet mask for the WAN link between router A and router
D? ______________________________________________________________________
106758278
0
255
106758278