Sample Exam Network and Routing

Instructions Sheet

1. Write all answers in the Examination Answer Booklet provided.

2. This examination containsthree parts, Parts A, B and C.

3. Answer all questions in all three parts, Parts A, B and C.

4. Write your answers clearly, using numbered headings or subheadings to show which part of your answer refers to which question. Example: Part B – Question 2a).

5. The total number of marks available in the examination is 60.

PART A 21 MARKS

SHORT ANSWER QUESTIONS

Answer ALL questions from this part.

Write your answers in the Examination Answer Booklet.

Each question is worth 1.5 marks (14 x 1.5 = 21 marks).

There will be 14 questions and some of them will be from the question bank given below:

Question 1

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Question 2

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Question 3

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Question 4

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Question 5

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Question 6

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Question 7

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Question 8

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Question 9

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Question 10

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Question 11

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Question 12

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Question 13

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Question 14

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Question Bank

Question 1

An IPv4 router receives a datagram which is bigger than the Maximum Transfer Unit of the next network. Under what condition can the router fragment this packet?

Question 2

An organisation has been granted a block of addresses with the mask /22. If the organisation creates 8 equal-sized subnets, how many addresses (including the special addresses) are available in each subnet?

Question 3

An organisation has been granted a block of class C addresses. If the organisation has 8 equal-sized subnets, how many addresses (including the special addresses) are available in each subnet?

Question 4

How does the destination know whether a datagram received is fragmented or not?

Question 5

How many equal-sized subnets can be created in a class C network by a subnet mask of /27?

Question 6

How many sequence numbers are consumed by an ACK segment that is carrying no data?

Question 7

Name the timers used in RIP.

Question 8

Name three transport layer protocols of the TCP/IP protocol suite.

Question 9

What is size of the port address field in a UDP header?.

Question 10

What is the default mask for a class B network in CIDR notation?

Question 11

What is the default mask for a class C network in CIDR notation?

Question 12

What is the difference between the primary and the secondary DNS servers?

Question 13

What is the last entry in a routing table?

Question 14

What is the maximum size of the IPv4 header?

Question 15

What is the minimum size of the IPv4 header?

Question 16

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

Question 17

What is the purpose of ARP?

Question 18

What is the purpose of flow control in networking?

Question 19

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

Question 20

What is the size of the base header in IPv6 in bytes?

Question 21

What is the type of switching used in ATM networks?

Question 22

When is a DNS response classifieds as a non-authoritative?

Question 23

Which address would a router use to send a packet to all other hosts on its subnet?

Question 24

Which field in the IPv6 header can point to the extension header?

Question 25

Which timer schedules the sending out of regular update messages in RIP?

Question 26

What is the difference between the primary and the secondary DNS servers?

Question 27

Why is path MTU discovery required in IPv6?

Question 28

What is the maximum size of the IPv4 header?

Question 29

Why do route changes in RIP take long time to propagate?

Question 30

Why do border routers need to maintain both interdomain and intradomain routing protocols?

Question 31

What are the purposes of ICMP messages?

Question 32

What do VLANs create?

Question 33

What is the loopback address in IPv6?

Question 34

What is the key difference between the topology of Extended Service SET (ESS) and mesh wireless networks?

Question 35

Why are source quench messages not available in ICMPv6?

PART B 15 MARKS

PRACTICAL PROBLEMS

Answer ALL questions from this part.

Write your answers in the Examination Answer Booklet.

Show your working.

There will be 4 questions where some calculations are involved.

Question 1 4 Marks

A company has been granted a block of addresses which starts at 220.20.10.0/24. Create the following 8 subnets for this company:

(a) 2 subnets with 64 addresses each

(b) 2 subnets with 32 addresses each

Question 4 5 Marks

The figure below shows the configuration of a hypothetical section of the Internet.

Construct the routing table of router R2 for this configuration by copying and completing the following table in the Examination Answer Booklet.

Mask	Network address	Next-hop address	Interface

PART C 24 MARKS

LONG ANSWER QUESTIONS

Answer the following questions with as much detail as you can.

Write your answers in the Examination Answer Booklet.

There will be 4 questions of the following type:

Question 1 6 Marks

Compare and contrast datagram and virtual circuit packet switching. Use your own words and do not copy directly from any source, including the textbook.

Question 2 6 Marks

Briefly describe the Destination-Sequenced Distance Vector (DSDV) routing protocol used for routing in ad hoc wireless networks. Use your own words and do not copy directly from any source, including the textbook.

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