it is ll about Firewall

I solve some question and there are questions that I didn't solve.

Please check my answer and solve left questionsQuiz: L13: Firewall Exercise 2017. 8. 4. 오후 8)32 https://psu.instructure.com/courses/1847260/quizzes/3214252/take 1/5페이지 L13: Firewall Exercise Started: Aug 3 at 2:10am Quiz Instruc!ons SMTP is the standard protocol for transferring mail between hosts over TCP. A TCP connection is set up between a user agent and a server program. The server listens on TCP port 25 for incoming connection requests. The user end of the connection is on a TCP port number above 1023. Suppose you wish to build a packet filter rule set allowing inbound and outbound SMTP traffic. You generate the following rule set: Firewall Exercise Rule Set Firewall rule Direction Source addr Dest addr Dest port Protocol Action A In external internal 25 TCP permit B Out Internal external * TCP permit C Out Internal external 25 TCP permit D In External internal * TCP permit E Either * * * * deny 질문 1 0.48 pts True False Rule A allows inbound traffic from external sources that has a destination port of 25 and uses a TCP protocol. 질문 2 0.48 pts Rule B allows an inbound connection from internal to external on any port with TCP protocol. Quiz: L13: Firewall Exercise 2017. 8. 4. 오후 8)32 https://psu.instructure.com/courses/1847260/quizzes/3214252/take 2/5페이지 True False 질문 3 0.48 pts True False Rule C denies an outbound connection from internal to external on port 25 with TCP protocol. 질문 4 0.48 pts True False Rule D allows inbound traffic from external sources that has any destination port and uses a TCP protocol. 질문 5 0.48 pts True False Rule E denies all other traffic. 질문 6 3.9 pts Your host in this example has IP address 172.16.1.1. Someone tries to send e-mail from a remote host with IP address 192.168.3.4. If successful, this generates an SMTP dialogue between the remote user and the SMTP server on your host consisting of SMTP commands and mail. Additionally, assume that a user on your Quiz: L13: Firewall Exercise 2017. 8. 4. 오후 8)32 https://psu.instructure.com/courses/1847260/quizzes/3214252/take 3/5페이지 host tries to send e-mail to the SMTP server on the remote system. Four typical packets on this scenario are as shown below in the table. Indicate which packets are permitted or denied and which rule is used in each case. So for each packet, make sure you specify if it is permitted or denied followed by the rule in brackets (). For this exercise to be graded correctly, you must spell permitted or denied correctly, followed by a space, then the rule in parenthesis, letter only. For example: Denied (D) - OR - Permitted (B) Packet Src Addr Dest Addr Protocol Source Port Dest Port ACK Action 1 192.168.3.4 172.16.1.1 TCP 1234 25 0 Permi!ed (A) 2 172.16.1.1 192.168.3.4 TCP 25 1234 1 Permi!ed (B) 3 172.16.1.1 192.168.3.4 TCP 1432 25 0 Permi!ed (C) 4 192.168.3.4 172.16.1.1 TCP 25 1432 1 Permi!ed (D) 질문 7 2.95 pts Someone from the outside world (10.1.2.4) attempts to open a connection from port 5150 on a remote host to the Web proxy server on port 8080 on one of your local hosts (172.16.3.4) in order to carry out an attack. Typical packets are as follows. Indicate which packets are permitted or denied. For this to be graded, only write permitted or denied. No spaces, or a rule in parenthesis for this particular question. Spell it correctly! Packet Direction Src Addr Dest Addr Protocol Source Port Dest Port Action 5 In 10.1.2.4 172.16.1.1 TCP 5150 8080 Permi!ed Quiz: L13: Firewall Exercise 2017. 8. 4. 오후 8)32 https://psu.instructure.com/courses/1847260/quizzes/3214252/take 4/5페이지 6 Out 172.16.3.4 10.1.2.4 TCP 8080 5150 Permi!ed To increase protection the rule set is changed as follows: Firewall rule Direction Source addr Dest addr Src Port Dest port Protocol Action A In external internal >1023 25 TCP permit B Out Internal external 25 * TCP permit C Out Internal external >1023 25 TCP permit D In External internal 25 * TCP permit E Either * * Any * * deny 질문 8 10.75 pts Apply this new rule set to the same six packets used before. Indicate which packets are permitted or denied and which rule is used in each case. So for each packet, make sure you specify if it is permitted or denied followed by the rule in brackets (). For this exercise to be graded correctly, you must spell permitted or denied correctly, followed by a space, then the rule in parenthesis, letter only. For example: Denied (D) - OR - Permitted (B) Packet Src Addr Dest Addr Protocol Source Port Dest Port ACK Action 1 192.168.3.4 172.16.1.1 TCP 1234 25 0 2 172.16.1.1 192.168.3.4 TCP 25 1234 1 Quiz: L13: Firewall Exercise 2017. 8. 4. 오후 8)32 https://psu.instructure.com/courses/1847260/quizzes/3214252/take 5/5페이지 Quiz saved at 8:32pm 3 172.16.1.1 192.168.3.4 TCP 1432 25 0 4 192.168.3.4 172.16.1.1 TCP 25 1432 1 Packet Direction Src Addr Dest Addr Protocol Source Port Dest Port Action 5 In 10.1.2.4 172.16.1.1 TCP 5150 8080 6 Out 172.16.3.4 10.1.2.4 TCP 8080 5150 Submit Quiz

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• 1509971054-Firewall.pdf