Laboratory assignments. 7. 3. 1 give the Short characteristic of Ethernet technology

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CHECK-UP QUESTIONS

7.3.1 Give the short characteristic of Ethernet technology.

7.3.2 Give a definition of Mac-address. From what parts does it consist of?

7.3.3 Explain the purpose of the ARP and its place in the TCP /IP model.

7.3.4 How to identify the type of ARP-packet? Is it possible to determine the MAC-address of the computer in another network?

7.3.5 Explain the purpose of the DHCP protocol and its place in the stack TCP / IP.

7.3.6 What methods of destination IP-addresses does the protocol DHCP support?

7.3.7 What does DHCP the «lease duration» use for? List the disadvantages of use DHCP.

7.3.8 Explain the purpose of the FTP protocol and specify the level of its position in the stack TCP / IP.

7.3.9 How is communication with a remote computer via FTP organized? Explain why protocol analyzers apply? What are the classes protocol analyzers divided? Explain the difference between them.

7.3.10 List the major constituent elements of a protocol analyzer. To what class of protocol analyzers is EtherPeek apply?

7.3.11 List the main features of a protocol analyzer EtherPeek. What are the limits not a trial version of EtherPeek? How does the buffer size in EtherPeek change?

7.3.12 For what do we use «front page» of EtherPeek? How can you organize the start / stop the capture process at a time?

7.3.13 What data shows the summary statistics?

7.3.14 What is EtherPeek «table name» used for?

7.3.15 What types of addresses can you use in EtherPeek to create filters?

7.4.1 Give the written answers to check-up questions.

7.4.2 Draw the frame format is Ethernet and ARP-packet.

7.5.1Researche the work of the protocol DHCP:

- run the protocol analyzer EtherPeek;

- establish screen capture;

- connect the filter to capture the DHCP packets;

- start the process of packet capture;

- using the command line to update the configuration of DHCP;

- perform an analysis of captured packets.

7.5.2 Research the work of the FTP protocol:

- establish an arbitrary text document;

- connect to a remote computer via FTP (address of the computer get from teacher);

- create a new capture window;

- connect the filter to capture FTP packets;

- start the capture process;

- perform sending a text document created on a remote computer via FTP;

- perform an analysis of captured packets.

7.5.3 Research the work of the protocol ARP, when the sender and receiver are located on the same network:

- identify the MAC-address and IP-addresses of the computers A and B;

- create four filters: the first - to capture the ARP-requests from computer A, the second - to capture the ARP-response from computer B to computer A, the third - to capture echo requests from computer A to computer B and the fourth - to capture echo-response computer B computer a (it is recommended to create a third filter to capture the echo requests from computer A to any computer, and the fourth - to capturethe echo response from any computer to computer A);

- launch a new window capture;

- connect by filters;

- clear the ARP-table;

- start the process of packet capture, and at the command prompt, type the command ping an IP-address of the computer B;

- perform an analysis of captured packets.

7.5.4 Investigate the work of the protocol ARP, when the sender and receiver are on different networks:

- establish a new window capture;

- connect the filters created in paragraph 7.5.3;

- clear the ARP-table;

- start the process of packet capture, and at the command prompt, enter the command ping an IP-address of the computer C (given by the teacher);

- perform an analysis of captured packets.

7.5.5 Research the work of the ARP protocol to verify the presence of a network of identical IP-addresses:

- determine the IP-addresses of the computers A and B;

- the PC And in a protocol analyzer, two filters - one for the capture of broadcast ARP-requests from computer B, and another - to capture the ARP-replies from computer A computer B;

- create a new screen capture - Capture;

- connect by filters;

- set IP-address of computer B is equal to IP-address of the computer A;

- start the process of packet capture;

- perform an analysis of captured packets.

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