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

This document is the answer template for Assignment 2 of COIT20261 Network Routing and Switching Term 1, 2019. It includes routing tables, explanations of classless addressing, and a comparison of inter-domain and intra-domain routing protocols.

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 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
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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.