COIT20261 | Network Routing and Switching Assignment 1 | Networking

Home Recent Questions COIT20261 | Network Routing and Switching Assignment 1 | Networking

Question 1 – Address usage    (3 marks)

Consider the following classless address block:

215.150.68.98/26

Answer the following questions:

a) What is the network address, and the last address, in this block? (1 mark)
b) What is the direct broadcast address? (1 mark)
c) How many addresses are available as host addresses? (1 mark)

Show the steps you took to arrive at your answers.

Question 2– Allocating subnets from a block    (8 marks)

A company has been granted a block of addresses which includes the address 172.38.216.7/22. Answer the following questions, showing your calculations.

Create the following 6 subnets for this company by calculating the correct number of addresses and subnet address for each subnet. Place your answer in the table in the Answer Template. Use CIDR format for the mask.

The six (6) subnets required by the company are as follows:

2 subnets with 100 addresses each  (2 marks)
2 subnets with 50 addresses each  (2 marks)
2 subnets with 25 addresses each (2 marks)

Calculating the number of addresses for each subnet correctly (2 marks)

Question 3 – Network Tools (Windows)    (4 marks)

Often the best way to gain an initial familiarity with network tools is to simply use them, at a basic level in exploratory mode as suggested in some of the tutorial exercises. Netstat and Tracert are included in Windows, while Wireshark is free to download and install. Explore Wireshark, Netstat and Tracert, then complete this question.

a) A wireshark scan has produced a packet capture, saved to a file named

wireshark_capture03.pcapng and available on the Unit website. Download the file and open it in Wireshark, then answer these questions about the scan:

i. View Frame 4: On which interface was this packet captured? what transport layer protocol was used (explain how you know)? (1 mark)
ii. View Frame 22406 (hint:use Go): What was the purpose of this message? How many bytes did the source indicate it could receive on the next packet (explain how you know)? (1 mark)
b) A ‘NETSTAT –an’ command has given the output below. On line 5 (highlighted), the TCP connection is in the “TIME_WAIT” state. Explain the TIME_WAIT state that the connection is in and the reason that this state exists. (1 mark)

Active Connections

Proto    Local Address    Foreign Address    State
01    TCP    10.0.0.58:139    0.0.0.0:0    LISTENING
02    TCP    10.0.0.58:5040    0.0.0.0:0    LISTENING
03    TCP    10.0.0.118:139    0.0.0.0:0    LISTENING
04    TCP    10.0.0.118:55987    162.125.34.129:443    ESTABLISHED
05    TCP    10.0.0.118:56103    52.230.240.94:443    TIME_WAIT   
06    TCP    10.0.0.118:52458    104.116.191.195:443    CLOSE_WAIT
07    TCP    10.0.0.118:52791    40.100.151.2:443    ESTABLISHED
08    TCP    10.0.0.118:52811    162.125.34.129:443    ESTABLISHED
09    TCP    10.0.0.118:52820    34.232.224.128:443    CLOSE_WAIT
10    TCP    10.0.0.118:52879    162.125.34.129:443    ESTABLISHED

c)    Do a TRACERT on your computer to www.twitter.com. Paste the output to your assignment one answer template and discuss the output in sufficient detail to demonstrate that you understand the information being displayed (1 mark)

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