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

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
are expected and marks may be deducted for failure to comply. For discussion or
research-based questions, If you decide to submit a graphic (e.g. a screenshot or a
diagram) in support of your answer, the graphic must be relevant to your discussion, be
appropriately referenced, and must have sufficient resolution to show all its details
clearly and be of a reasonable size for normal reader viewing, with all or any text within
the graphic being legible and readable. Originality means the work is your own and is
expressed in your own words. An answer is unacceptable if it is composed mostly of
quoted material from other sources, and may in some cases receive no marks as a
result.
First Name:_________________________ Last Name:____________________________
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
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