vlsm exercise
TRANSCRIPT
C:\ndm\vlsm-exercise.doc Page 1 2/3/2005
VLSM IP addressing exercise. Build a VLSM (Variable Length Subnet Mask) plan using the class C network 192.168.100.0/24. You will need to address all the interfaces in the attached diagram on routers R1, R2, R3, R4, and R5. Do not worry about router R6 or the R3-R6 serial link which is already addressed. You will need to use a technique called “variable length subnet masking” (VLSM) where you subdivide your network address space into subnetworks of different sizes. Each of the Ethernet interfaces needs a subnet that can support 6 hosts. Each router has 4 loopback addresses that need to support the number of hosts in the table below. Configure your plan so that the loopback subnets can be summarized as a single subnet. (Allocate a single subnet for use on each router’s loopback interfaces, then subnet further.)
INTERFACE # HOSTS loopback0 14 hosts loopback1 6 hosts loopback2 2 hosts loopback3 2 hosts
Begin by looking at each network and deciding how many host addresses must be supported to figure out the size of each subnet. You must do this with maximum efficiency as there no extra addresses, only exactly enough to solve this problem. For each of the five routers, select the loopback subnets such that they can be summarized. If you do not understand the concept of summarization, read up on CIDR – Classless Internet Domain Routing. Turn in a table showing your subnet plan and another table showing the interfaces and their assigned IP addresses.
VLA
N90
VLA
N80
VLA
N70
VLA
N60
VLA
N50
VLA
N40
VLA
N30
VLA
N20
128.
186.
121.
0/24
100MbpsFDDI Ring
VLA
N10
R5 (4500)
R2 (7000)
R1 (7000)
R4 (7000)
2Mbps
2Mbps
R3 (7000)
S1/3S1/3DCE
S1/6
S1/1DCE
E2/0 E1
FDDI0
vlsm-exercise.vsd 03-Feb-2005 R.Curci
FW/R6 (2511)
COMP SCINETWORK
2Mbps
S1DCE
E2/5 E0FA0
NAT
VLSM EXERCISE
2Mbp
s
S1/2
2Mbps
L0
L1
L2
L3
L0
L1
L2
L3
L0
L1
L2
L3
L0
L1
L2
L3
L0
L1
L2
L3
FDDI0/0
FDDI0/0
FDDI0/0
FDDI0/0
S1/4
S1/2DCE
S1/2 DCE
192.168.36.3/24
192.168.36.6/24
S1/4