COIT20261 Network Routing and Switching Term 1, 2019 - Written Assessment-2

This document provides answers and solutions for COIT20261 Network Routing and Switching Term 1, 2019 - Written Assessment-2. It includes marking criteria, routing tables, classless addressing, inter-domain routing, and more.

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
ANSWER TEMPLATE ASSIGNMENT TWO
Type your answers in the spaces provided
Marking criteria: Your answers will be marked based on technical correctness,
completeness, clarity, originality and relevance. Proper use of referencing conventions
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result.
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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
/18 150.32.0.0 150.32.0.1 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
Lammle gives routing template table as above (Lammle, 2015)
.
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
5 max
5 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
/18 161.22.0.0 -------- M2
/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
As discussed by Carthern and Wilson, (Carthern & Wilson, 2016)
Question 2: (5 marks)
a) Lammle notes that in a classless addressing, the entire address space is
taken as one entity, this implies that packet forwarding requires one row
of data to for every block that is taking place. At least four columns are
required and network address extraction is done at the same time during
the table search (Lammle, 2013)
1 max
b) Steps:
1. The first mask (/18) is applied to the destination host address. The
outcome will be 150.32.192.0. This does not match the corresponding
network address.
2. We apply the next mask on this address. The mask is (/16), when
apply to the address, we have 150.32.0.0. This result matches the
corresponding network address. The destination address of the packet
and the interface number m0 are passed to the ARP.
Duggan explains above process of classless routing, (Duggan, 2014)
2 max
c) Step 1: we apply the first mask (24) on the given host address. The
result will be 150.32.48.0. This network address matches the given
network address. Therefore the destination address of the packet and
interface number m1 will be passed to the ARP, as commented by
Forouzan, (Forouzan, 2017)
2 max
Question 3: (10 marks)
a) An Autonomous system in routing refers to collection of networks or a
network which is managed and supervised using a single organization or
domain/entity/administration. An example of autonomous system is the
ISP. BGP is the protocol which addresses the forwarding of the packets
amongst different autonomous system.
1 max
b) To bring out the meaning of inter-domain routing, define the term
domain. The internet we know is a set of networks, that is to say, there
are a lot of autonomous systems on the internet, each network can be
2 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
termed as a domain, inter-domain routing therefore denotes to routing
that is taking place between two or more different networks/domains.
BGP is the only routing protocol that associates with inter-domain
routing.
c) Empson gives a description of Intra-domain routing as a kind of packet
forwarding within a single network, that is to say, routing within an
organization between different subnets. This kind of routing focuses on
the quality of latency, bandwidth load balancing. Example routing
protocols associated with this kind of routing are EIGRP, IS-IS, OSPF
and RIP (Empson, 2013 ).
2 max
d) BGP – inter-domain routing and OSPF-intra-domain routing are our
chosen examples for comparison
No OSPF BGP
1 Is and Intra-domain
routing protocol
Is an inter-domain routing protocol
2 Uses link state routing Uses path vector routing
3 Is an internal gateway
protocol
Is an external gateway protocol
4 Uses Dijkstra algorithm Uses best route algorithm
The only similarity between the two is that both are dynamic routing
protocols.
3 max
e) Lammle and Swartz explains that there are different protocols for inter-
domain and intra-domain routing protocols because there exists different
types of networks of which can only be supported by a particular intra-
domain or inter-domain routing protocols. For instance, RIP cannot fully
support a classless network, therefore it means we must have another
protocol that will support a classless network, and OSPF will come to be
in handy. (Lammle & Swartz, 2013)
2 max
Total marks awarded 25 (max)
Less late penalties
Less plagiarism penalties
Total marks earned

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
Markers comments:
References
Carthern, C. & Wilson, W., 2016. OSI layers. In: Cisco Networks: Engineers' Handbook of Routing,
Switching, and Security. New York City: Apress, pp. 35-46.
Duggan, M., 2014. Cisco CCIE Routing and Switching v5.0 Configuration and Troubleshooting. In:
Cisco CCIE Routing and Switching. Indianapolis: Cisco Press, pp. 321-3330.
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.
Lammle, T., 2015. CompTIA Network+ Study Guide, (Exam: N10-006). 4th ed. New York City: John
Wiley & Sons..
Lammle, T. & Swartz, J., 2013. CCNA Data Center - Introducing Cisco Data Center Networking Study
Guide. 6th ed. Hoboken, New Jersey: John Wiley & Sons.