CSCI 4171/CSCI 6704
NETWORKS
ASSIGNMENT NO.5
Date Given: Monday, November 14th, 2022
Date Due: Monday, November 28th, 2022, 11.59 PM
This assignment consists of two questions on subnet design, and two short snappers on routing algorithms.
1. Given a class C network address 201.45.68.0 and the following subnet requirements:
a. Subnet A: must support 14 hosts
b. Subnet B: must support 28 hosts
c. Subnet C: must support 2 hosts
d. Subnet D: must support 10 hosts
e. Subnet E: must support 45 hosts
Draw the topology of the internetwork showing the main gateway router at the exit point of the internetwork,
routers at the exit point of each subnet, and each of these routers connecting to the main gateway router (similar to
the examples from the lectures). The above requirement does not include router interfaces, or the extra networks
created by router interconnections (that is, you must add them and account for them).
Design the subnetting scheme using VLSM. You need to account for all the extra addresses required by the routers.
Show all steps. In the final solution table, indicate the subnet number, host ranges, broadcast address and mask for
each subnet. Also indicate the total number and ranges of free addresses.
2. Repeat the VLSM design problem for the following scenario:
Subnet A: 29 hosts
Subnet B: 10 hosts
Subnet E
Subnet C: 45 hosts
Subnet D: 7 hosts
The class C address allocated to the network is 209.78.32.0. The router interfaces must also be assigned with
addresses 4hese are not included in the number of hosts given.
3. The following figure shows a network of routers. Also assume that networks N1, N2, etc. are connected
to routers A, B, etc., respectively. The cost of each link is shown and that the cost from each router to its
directly connected network is 0. Assume that the network runs the Distance Vector algorithm.
(a) Write the DV table in router B after stabilization.
(b) Suppose that the link BE fails, write the new DV table in router B after re-stabilization.
(c) Suppose that the link EF also fails (in addition to BE), write the new DV table in router B after restabilization.
Note: Write only the final tables .o need to show the intermediate steps.
3
2
A
B
2
C
1
D
3
E
3
1
2
F
4. The following figure shows a network of routers running the link state routing algorithm. The
numbers on the links represent costs. Assume that R1 is directly connected to a network N1 with a cost
of 0, R2 to N2, etc. Write the link state database (topology information database) that will be stored in
each router after flooding.
4
R2
R3
1
R4
R1
2
3
6
5
7
R6
R5
8
Submission: Submit one PDF file with the answers to the above questions. If you write your answers by
hand, please ensure that your handwriting and photo scan are legible. Ensure that your name and banner ID
appears at the top of the document.
Late Penalty: The assignment is due on Monday, November 28th, 11.59 PM. A grace period of up to 5
hours (4.59 AM on Tuesday) is allowed. After that, there will be a penalty of 10% per day of your mark
received. Late submissions past 5 days will not be accepted.

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