Question Bank 2

Question Bank 2 Answers

There are 20 questions in this part.Select the most suitable answer for each question from the choices in the table provided at the end of the 20 questions.

Write answers in the Examination Answer Booklet against the question number. There is no need to justify your answers or rewrite the questions.

Question 1

In the OSI model, the only layer where a trailer is added to the packet arriving from the higher layer is the _____________________ layer.

Question 2

SONET is a standard for _____________________ networks.

Question 3

198.10.16.2 is a(n) _____________________ address.

Question 4

In _____________________ routing, the destination address is a network address in the routing table.

Question 5

An ARP _____________________ is broadcast to all hosts on the network.

Question 6

The maximum size of IPv4 header is _____________________ bytes.

Question 7

If a host needs to synchronise its clock with that of another host, it sends a(n) _____________________ message.

Question 8

When the hop count field in a packet reaches zero and the destination has not been reached, a(n) _____________________ error message is sent.

Question 9

In UDP, the server program uses a(n) _____________________ port number.

Question 10

The maximum size of options field in the TCP header is _____________________ bytes.

Question 11

The sending out of regular update messages in RIP is scheduled by the _____________________ timer.

Question 12

The server program is _____________________ because it is always available, waiting for a client to request.

Question 13

 

Question 14

A domain is a(n) _____________________ of the domain name space.

Question 15

The ARP request message is _____________________ on the network.

Question 16

In FTP, when you _____________________ a file, it is copied from the server to the client.

Question 17

_____________________ are used to number the packets of a RTP transmission.

Question 18

RIP and OSPF are _____________________ routing protocols.

Question 19

The payload length field defines the total length of the IPv6 datagram excluding the _____________________ header.

Question 20

TCP is a(n) _____________________ transport layer protocol.

List of possible choices as answers for Question Bank 2:

broadcast destination unreachable unreliable
periodic class C reliable
interior timestamp-request fiber optic cable
network-specific 50 ephemeral
copper data link subtree
well-known host-specific reply
40 retrieve passive
base sequence numbers
60 request

PRACTICAL PROBLEMS 

Answer ALL questions from this part.

Write answers in the Examination Answer Booklet.

Show your working.

Question 1                                                                                                                    4 Marks

An organisation has been allocated the following block of classless addresses by its ISP:

166.128.170.16/29

List all the addresses in this range and identify those that can be used by the hosts, the network address and the direct broadcast address.

Question 2                                                                                                                    4 Marks

The first 12 bytes of a dump of a TCP header in hexadecimal notation is shown below:

04210019 000007D0 00000641

  • What is the source port number?
  • What is the destination port number?
  • What is the sequence number?
  • What is the acknowledgement number?

Term 2 Standard Examination 2013

Networking with TCP/IP

Question 3                                                                                                                    4 Marks

An organisation has been granted a block of addresses which starts at 208.110.30.0/24.  Create the following 8 subnets for this company:

  • 2 subnets with 64 addresses
  • 2 subnets with 32 addresses
  • 4 subnets with 16 addresses

Design the subnets by copying and completing the following table in the Examination Answer Booklet.

Number of addresses Subnet address (including prefix length)

Question 4                                                                                                                    3 Marks

Given the following IPv6 addresses in hexadecimal colon notation, answer the following questions. Where applicable leave your answers in fully expanded hexadecimal colon notation.

  • What is the full (expanded) address of the abbreviated IPv6 address

FDEC::CF:0:FFFF                                                                                              (1 mark)

  • What is the type of block of the abbreviated IPv6 address

2001:A100:FC1::A4B8:AE12:3217:FCBA                                                      (1 mark)

  • What is the type of address of the abbreviated IPv6 address

0::FFFF:194.42.12.7                                                                                          (1 mark)

Term 2 Standard Examination 2013

Networking with TCP/IP 

Question 5                                                                                                                    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.

Term 2 Standard Examination 2013

Networking with TCP/IP 

Question 1 6 Marks

Briefly describe the 3-way connection establishment and 3-way connection termination in TCP.  Support your answer with relevant diagrams. Use your own words and do not copy directly from any source, including the textbook.

Question 2                                                                                                                    4 Marks

Discuss clearly the recursive and iterative DNS resolution. Use your own words and do not copy directly from any source, including the textbook.

Question 3                                                                                                                    4 Marks

Discuss, with the help of diagrams, any two of the following three strategies recommended by the IETF to provide for transition from IPv4 to IPv6:

Dual Stack

Tunnelling

Header Translation

Use your own words and do not copy directly from any source, including the textbook.

Question 4                                                                                                                    6 Marks

Discuss the use of Timestamps, Sequence Numbers and the playback buffer in realtime audio/video communication.

Download immediately available after purchase