Homework Answers

Which one of the following is one of the 3-step-communication in networking ?

a. tcp-Syn

b. tcp-Seen

c. tcp-Sink

d. tcp-Sing

. Which one of the following is a famous cyber security attack type?

a. Man-in-the-head-attack

b. Man-in-the-middle-attack

c. Man-in-the-front-attack

d. Man-in-the-tail-attack

 How many valid host addresses are available on an IPv4 subnet that is configured with a /25 mask?

a. 254

b. 126

c. 62

d. 30 

. Which of the following is correct as part of DDos-attack (shown in class) ?

a. netsox 76 -i 10.0.2.6 -p 23 -s raw

b. netfox 76 -i 10.0.2.6 -p 23 -s raw

c. netwox 76 -i 10.0.2.6 -p 23 -s raw

d. netvox 76 -i 10.0.2.6 -p 23 -s raw

Which one of the following is correct?

a. In IP broadcasting, the message is delivered to all hosts on the same subnet

b. In IP broadcasting, the message is delivered to most hosts on all subnets

c. In IP broadcasting, the message is delivered to all hosts on most subnets

d. In IP broadcasting, the message is delivered to all hosts on all subnets

Which of the following is correct as part of DDos-attack (shown in class) ?

a. sysctrl -w net.ipv4.tcp_syncookies=0

b. syscopy -w net.ipv4.tcp_syncookies=0

c. syscmd -w net.ipv4.tcp_syncookies=0

d. sysctl -w net.ipv4.tcp_syncookies=0 

What unique address is embedded in an Ethernet NIC and used for communication on an Ethernet network?

a. Host address

b. IP address

c. Network address.

d. MAC address

Which command can be used to make socket programming between two computers that are attached to the same network (shown in class) ?

a. connectionSocket, addr = serverSocket.send()

b. connectionSocket, addr = serverSocket.accept()

c. connectionSocket, addr = serverSocket.reject()

d. connectionSocket, addr = serverSocket.receive()

Narendra is given a list containing non-repetitive numbers. You need to write a python function se-L(X) which takes input list X and returns five lists , one contains all prime numbers in A , 2nd one contain composite numbers in A , the third list contains all in A which are divisible by 2 , 4th and 5th list contain numbers divisible by 3 and 5 respectively

For example if X = [1,2,3,4,5,12,25,30,37] then 1st list = [2,3,5,37] , 2nd list=[4,12,25,30]

3rd list=[2,4,12,30] , 4th list=[3,12,30] and 5th list=[5,25,30] . Specify input in fixed form.

Briefly describe the following terms implemented in network security. (9 marks)

a Confidentiality (3)

b Authentication (3)

c Message Integrity (3)