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COIT20261 | Network Routing and Switching Term 3 (17) | Networking

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PART A
Question 1

List three differences between UDP and TCP.

Question 2
What does “path MTU discovery” in IPv6 refer to?

Question 3

In your own words, briefly explain the function of the garbage collection timer in RIP

Question 4
Identify 3 differences between Distance Vector routing protocol and the Link State routing protocol.

Question 5
Fragment offset value is 200. What is the number of the first byte?

Question 6

What is the purpose of the hop limit field in the base header of an IPv6 datagram?

Question 7

What is the purpose of an access point in a Wi-Fi network?

Question 8
What is the maximum size of an IPv4 header?

Question 9

Explain why IPv4 datagrams contain a checksum, but IPv6 datagrams do not.

Question 10
What is a DNS resolver? Explain.

Question 11
Explain efault forwarding and what the mask and the destination addresses of the routing table should be for a default forwarding entry

Question 12
What is the default mask for a class B address in CI    R notation

Question 13
Which field in the IP    6 base header restricts the lifetime of a datagram

Question 14
The following is an abbreviated IPv6 address:
80:3:A7A::20:0:3E
write the full (expanded) address of this abbreviated    dd

PART B
Question 1    4 Marks

An organisation has been allocated the following block of classless addresses by its ISP: 137.77.217.6/28
Identify the addresses in this range that would be used as the network address, those that can be used by network hosts, and the direct broadcast address.

Question 2    4 Marks
A company has been granted a block of addresses which starts at 200.100.20.0/23. Create the following 8 subnets for this company by calculating the subnet address for each subnet.
(a) 2 subnets with 64 addresses each
(b) 4 subnets with 32 addresses each
(c) 2 subnets with 16 addresses each

Question 3    2 Marks
The following is an ICMPv6 message fragment with its header (in hexadecimal):
01 04 B1 B5 00 00 00 00 00 00 00 00 00 ...
Identify the information that is carried in the header, and state their values. What type of ICMPv6 message is this? What is the message?

Question 4    5 Marks

The figure below shows the configuration of a hypothetical section of the Internet.
Construct the routing table of router R1 for this configuration by copying and completing the following table in the Examination Answer Booklet.

PART C
Question 1    6 Marks

Discuss how fixed-length classful addressing affects organisations in terms of address allocation, and how subnetting, supernetting, and Classless Inter-Domain Routing (CIDR) have helped resolve these issues.

Question 2    6 Marks
IPv6 was proposed to address various limitations and weaknesses in IPv4. Identify six key changes that were introduced in IPv6, and briefly explain them. Use your own words to describe, and do not copy directly from any source including the textbook.

Question 3    6 Marks

Although a Wireless Sensor Network appears to be very similar to a wireless ad hoc network in its characteristics and working paradigm, there are significant differences between the two networks. Discuss the difference between these two Networks and major constraints challenging the development of a robust, optimized, and common routing protocol for a Wireless Sensor networks.

Question 4    6 Marks
Three types of wireless network architectures exist: the independent Basic Service Set (IBSS); the Extended Service Set (ESS) and Mesh Wireless (MW) networks. Briefly describe the essential differences between IBSS, ESS and MW and comment on where each architecture might appropriately be utilized.

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