COIT20261 Network Routing and Switching Term 1, 2019 - Assignment 2

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
ANSWER TEMPLATE ASSIGNMENT TWO
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Questions Mark
allocated
Mark
earned
Question 1: (10 marks) 5 each
table
Answer: Routing table of router R2:
Mask Network address Next-hop address Interface
/24 200.11.60.0 ---------- M1
/24 220.10.40.0 150.3.0.3 M0
/22 140.21.0.0 ---------- M2
/18 161.22.0.0 150.3.0.3 M0
/18 150.32.0.0 150.3.0.1 M0
/16 150.3.0.0 150.3.0.3 M0
/16 150.3.0.0 150.3.0.4 M0
/16 150.3.0.0 150.3.0.1 M0
Default Default 150.3.0.4 M0
(Sequeira, 2013 )
Routing table of router R3:
Mask Network address Next-hop address Interface
/24 220.10.40.0 ---------- M1
/24 200.11.60.0 150.3.0.2 M0
/22 140.21.0.0 150.3.0.2 M0
/18 150.32.0.0 150.3.0.1 M0
/18 161.22.0.0/18 ---------- M2
/16 150.3.0.0 150.3.0.2 M0
/16 150.3.0.0 150.3.0.4 M0
/16 150.3.0.0 150.3.0.1 M0
Default Default 150.3.0.4 M0
(Carthern & Wilson, 2016)
5 max
5 max
Question 2: (5 marks)
a) Unlike class-full addressing we have a routing table with three fields
(mask, network and next hop address), in classless addressing we require
four fields, i.e. mask, network, next-hop address and the exit interface.
1 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
The network addresses together with the other parameters are arranged
in rows on the basis of the longest masks. The routing process compares
the subject network address with the routing table rows. The process
continues until there is match in the network. Once a match is found, the
next-hop address and the interface are forwarded to ARP table.
b) Mask Network address Next-hop address Interface
/24 220.10.40.0 150.3.0.3 M0
/24 200.11.60.0 150.3.0.2 M0
/22 140.21.0.0 150.3.0.2 M0
/18 161.22.0.0 150.3.0.3 M0
/18 150.32.0.0 ------------------ M1
/16 150.3.0.0 150.3.0.4 M0
/16 150.3.0.0 150.3.0.3 M0
/16 150.3.0.0 150.3.0.2 M0
Default Default 150.3.0.4 M0
Step 1: we apply the first (/24) on the destination network address. The
result will be 150.32.0.0. This does not match the corresponding
address.
Step 2: we apply the second mask (/22) on the network address. The
result will be 150.32.0.0 which does not match the corresponding
network address.
Step 3: we apply the third mask (/18), the result will be 150.32.0.0. This
result matches the corresponding network address. The next hop-address
and interface are passed to the ARP (Forouzan, 2017).
2 max
c) Mask Network address Next-hop address Interface
/24 220.10.40.0 ------ M1
/24 200.11.60.0 150.3.2 M0
/22 140.21.0.0 150.3.2 M0
/18 150.3.0.0 150.3.1 M0
/18 161.22.0.0/18 ------ M2
/16 150.3.0.0 150.3.2 M0
/16 150.3.0.0 150.3.4 M0
/16 150.3.0.0 150.3.1 M0
Default Default 150.3.4 M0
1. We apply the first (/25) on the network address. The result is
150.32.48.0 which does not match the corresponding network
address
2. We apply the second mask (/22) on the network address. The
result is 150.32.48.0. This result does not match the
corresponding network address.
3. We apply the third mask on the network address. The result is
150.32.0.0. this result does not match the corresponding network
2 max