18 - 23 Please answer all. Thank you very much.

18. Complete the following for the IP address 191.168.150.20 with a subnet mask 255.255.240.0: 18a) class : _______________ 18b) CIDR notation : ______________ 18c) network identifier : _________________ 18d) subnet identifier : _________________ 18e) Machine ID: _____________________

Below picture contains the options for the above question

19. What is the CIDR notation of the 123.85.101.0 subnet having a 255.255.255.224 mask?

20. On which layer(s) of the OSI model do DoS attacks apply? Please choose an answer.

a) Application and Presentation.

b) Session and transportation.

c) Network and data link.

d) All answers

21. What IPV4 message does an IPV4 host use to respond when it receives a DHCP0FFER message from the DHCP server? Please choose an answer.

a) DHCPACK.

b) DHCP OFFER.

c) DHCPDISCOVER.

d) DHCPREQUEST.

22. Your friend tries desperately to print a document, but without success. He asks you to look at his network diagram. What are the problems) ? Please choose at least one answer. (you can choose more than one answer)

a) Router B's IP address is incorrect

b) The printer's IP address is incorrect

c) Router A's IP address is incorrect

d) The computer's IP address is incorrect

e) None of his answers

23. In the below picture, What is the packet number that allowed the server to permanently close the FTP session of the FTP client 10.11.12.2? Please choose an answer.

a) #248

b) #249

c) #252

d) #247

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