COIT20261 Network Routing and Switching Term 1 2019 Assignment

This assignment solution covers key concepts in network routing and switching, focusing on routing tables, classless addressing, and inter-domain vs. intra-domain routing. It provides detailed routing tables for routers R2 and R3, explaining the logic behind next-hop address selection and interface usage. The solution further clarifies the differences between classful and classless addressing, demonstrating how longest match rules are applied during packet forwarding. Additionally, it distinguishes between inter-domain and intra-domain routing, highlighting the roles of protocols like BGP and EIGRP, and discusses why different protocols are necessary to support diverse network types. This comprehensive solution, available on Desklib, offers valuable insights for students studying network routing and switching.

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 NA M1
/24 220.10.40.0 150.3.0.3 M0
/22 140.21.0.0 NA 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
Routing table of router R3:
Mask Network address Next-hop address Interface
/24 220.10.40.0 NA 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 NA M2
5 max
5 max

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
/16 150.3.0.0 150.3.0.2 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
Question 2: (5 marks)
a) In classless addressing, four columns are needed, i.e. mask, and network
address, next-hop address and the exit interface. This whole address
space is taken as one entity, for forwarding to take place, every row of
packet is compared to the packet using the longest match rule until the
network that matches is to corresponding network is reached. If not
available the packet is forwarded to the default route (Duggan, 2014).
1 max
b) Step 1: The first mask (/24) is applied to the destination address.
The result is 150.32.48.0, which does not match the corresponding
network address.
Step 2: The second mask (/22) is applied the network address. The
result is 150.32.48.0 which does not match the corresponding
network address.
Step 3: the 3rd mask (/18) is applied to destination address, the result
is 150.32.0.0. The result matches the corresponding network
address. The next-hop address (150.3.0.1) and the interface (M0)
are passed to the ARP for further processing (Carthern & Wilson,
2016).
2 max
c) Step 1: The first mask (/24) is applied on the destination address. The
outcome is 150.32.48.0. This does not match the corresponding network
address.
Step 2: the 2nd mask (/22) is applied to the destination address, the
outcome is 150.32.48.0. The result does not match the respective
network address.
Step 3: the 3rd mask (/18) is applied to the destination address, the
outcome is 150.32.0.0. This matches the corresponding network
address. The next-hop address (150.3.0.1) and the interface (M0) are
passed to the ARP for further processing (Forouzan & Fegan, 2015).
2 max
Question 3: (10 marks)

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
a) The autonomous system denotes a group of networks which are
controlled and overseen by use of one organization or administration.
BGP protocol is used to forward packets between different autonomous
systems. ISPs are examples of autonomous systems.
1 max
b) Inter-domain routing defines the forwarding of packets between
different networks which use different routing protocols. For instance,
network A has a routing protocol of OSPF and network B uses RIP
protocol, the kind of routing that will take place between network A and
B is inter-domain routing. BGP protocol is deployed in inter-domain
routing.
2 max
c) Whereas inter-domain routing takes place between networks whose
routing protocol is different, intra-domain routing is a kind of routing
which takes place between networks which are using similar type of
routing to forward packet. For example network A uses OSPF routing
whereas network B uses OSPF too, the kind of routing which will take
place between networks A and B is called intra-domain routing.
Example protocols are OSPF, RIP, EIGRP (Lammle, 2013).
2 max
d) We select EIGRP as an intra-domain protocol and BGP as inter-domain
protocol. The table below gives the differences
Feature EIGRP BGP
Method Is an advanced
distance vector
Is a path vector
Convergence Has a fast
convergence
Has a slow
convergence
Mixed Vendor
devices
Does not support
mixed vendor
devices
Supports mixed
vendor devices.
The similarities between the two is that both are VLSM supported,
3 max
e) Different inter-domain and intra-domain protocols exists because we
have different kinds of networks and there exists no single protocol that
can support all the types of networks. A good example is having a
network that is sub-netted in class-less manner, such protocols as RIP
may not support this, hence a requirement that anther protocol must be
in existence to support this (Empson, 2013 ).
2 max
Total marks awarded 25 (max)

COIT20261 Network Routing and Switching Term 1, 2019
Assignment item —Written Assessment-2
Less late penalties
Less plagiarism penalties
Total marks earned
Markers comments:
References
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.
Forouzan, B. & Fegan, S. C., 2015. Data Communications and Networking. 4th ed. s.l.:Huga Media.