Network Routing and Switching (COIT20261) Assignment - Term 1, 2019

This document presents a comprehensive solution to a network routing and switching assignment (COIT20261, Term 1, 2019). The assignment covers key concepts including the creation and interpretation of routing tables for routers R2 and R3, addressing schemes, and the application of masks in classless addressing. The solution analyzes the routing process, demonstrating how routers determine the next hop and interface for data packets. Furthermore, the assignment delves into autonomous systems, differentiating between inter-domain and intra-domain routing, and comparing routing protocols such as RIP and BGP. The solution includes detailed explanations, diagrams, and references to support the answers, providing a thorough understanding of the network routing principles. The assignment is designed to test students' knowledge of routing concepts and their ability to apply them in practical scenarios.

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
ANSWER TEMPLATE ASSIGNMENT TWO
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Student ID: __________________________
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
/18 150.32.0.0 150.32.0.1 M0
/16 150.3.0.0 150.3.0.3 M0
/16 150.3.0.0 150.3.0.1 Mo
/16 150.3.0.0 150.3.0.4 M0
Default Default 150.3.0.4 M0
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 -------- M2
5 max
5 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
/16 150.3.0.0 150.3.0.4 M0
/16 150.3.0.0 150.3.0.2 M0
/16 150.3.0.0 150.3.0.1 M0
Default Default 150.3.0.4 M0
Question 2: (5 marks)
a) In classless addressing, we use four columns to identify a network
address. For a router to determine whether a given network is in its
routing table, the router applies the mask on the corresponding network
addressing checking the result with the networks that are available in the
routing table. If the network finds its match with the network in the
table, the next hop-address and interface are passed to the ARP. In case
the network does not find the match, the packet is forwarded to the
default network (Bianco & Neri, 2013).
1 max
b) Mask Network address Next-hop address Interface
/24 220.11.60.0 150.3.0.2 M0
/24 220.10.40.0 150.3.0.3 M0
/22 140.21.0.0 150.3.0.2 M0
/18 150.32.0.0 ------- M1
/18 161.22.0.0 150.3.0.3 M0
/16 150.3.0.0 150.3.0.3 M0
/16 150.3.0.0 150.3.0.4 M0
/16 150.3.0.0 150.3.0.2 M0
Default Default 150.3.0.4 M0
The routing process takes the steps below
1. Apply the first mask (/24) on the network address. The
outcome will be 150.32.0.0. This network does not match the
corresponding address.
2. Apply the second mask (/22) on the IP address, the outcome
will be 150.32.0.0. this network does not match the respective
network address
3. Apply the third mask (/18) on the network address. The
result will be 150.32.0.0. This result matches the
corresponding network address. The next hop-address and
the interface are passed to the ARP (Forouzan, 2017).
2 max
c) We use the table in 1(b) above. The outing process takes the steps
below.
1. Apply the first mask (/24) on the network address. The result
will be 150.32.48.0. This network does not match the
2 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
corresponding network address.
2. Apply the second mask (/22) on the network. The result will be
150.32.48.0. this network does not match the corresponding
network address
3. We apply the third mask (/18) on the network address. The result
is 150.32.0.0. This network matches the corresponding. The next
hop-address and the interface are passed to ARP (Empson,
2013 ).
Question 3: (10 marks)
a) An autonomous in a networked system refers to a group of networks that
are managed by one administration. Internet Service Provider is a good
example of an autonomous system.
1 max
b) An inter-domain routing is the routing that takes place between networks
whose routing protocols are totally different. We can say inter-domain
routing occurs in an autonomous systems. Example protocol that
implements inter-domain routing is BGP
2 max
c) Intra-domain routing on the other hand is a kind of routing in which
takes place between routing protocols of the same kind. For instance,
when network 1 is using OSPF the other network 2, ought to use OSPF
too.
2 max
d) In this task we compare RIP and BGP as examples of intra-domain and
inter-domain routing respectively.
Differences
a. Whereas BGP supports VLSM, RIP does not support VLSM.
b. BGP is a fully meshed network whereas RIP is a flat network.
c. RIP is used with small networks, BGP supports very huge
networks.
d. BGP is built on the basis of an autonomous system whereas RIP
is built on the basis to hop count.
It is noted that both BGP and RIP have slow convergence time
(Lammle, 2013).
3 max
e) Note that having different types of inter-domain and intra-domain
routing protocol is a necessity. This is because we have different types
of networks that will require different routing architecture on the basis
of different factors such as resource availability, technical staff etc.
thereto having different types of routing protocols is necessary.
2 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
Total marks awarded 25 (max)
Less late penalties
Less plagiarism penalties
Total marks earned
Markers comments:
References
Bianco, A. & Neri, F., 2013. Addressing. In: Next Generation Optical Network Design and Modelling.
New York City: Springer, pp. 92-99.
Empson, S., 2013 . CCNA Routing and Switching Portable Command Guide. Indianapolis: Cisco Press.
Forouzan, 2017. Tcp/Ip Protocol Suite. 4th ed. New York: McGraw-Hill.
Lammle, T., 2013. CCNA Routing and Switching Review Guide: Exams 100-101, 200-101, and 200-
120. Hoboken: John Wiley & Sons.