Network Address Translation. Consider the following scenario in which host 10.0.0.1 is communicating with an external web server at IP address128.119.40.186. The NAT table shows the table entry associated with this TCP flow. What are the source and destination IP address and port numbers at pointA?HFS:D:NAT translation tableWAN side addr138.76.29.7, 5051138.76.29.710-The source IP address is:The destination IP address is:The source port number is:The destination port number is:LAN side addr10.0.0.1, 2020110.0.0.4D:S:D:A10.0.0.110.0.0.210.0.0.310.0.0.1[Choose ][Choose ][Choose ]

1. Host 10.0.0.1 is communicating with the external web server (referenced in the question ), so…

Answered: The source IP address is: The…

The source IP address is: The destination IP address is: The source port number is: The destination port number is: 10.0.0.1 [Choose ] [Choose ] [Choose ] <

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Network Address Translation. Consider the following scenario in which host 10.0.0.1 is communicating with an external web server at IP address
128.119.40.186. The NAT table shows the table entry associated with this TCP flow. What are the source and destination IP address and port numbers at point
A?
HF
S:
D:
NAT translation table
WAN side addr
138.76.29.7, 5051
138.76.29.7
10-
The source IP address is:
The destination IP address is:
The source port number is:
The destination port number is:
LAN side addr
10.0.0.1, 2020
110.0.0.4
D:
S:
D:
A
10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.1
[Choose ]
[Choose ]
[Choose ]

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Given the IP address 180.15.128.0/20. Now, using the given IP address space create five subnets in such a way so that less number of IP address is wasted for each subnet and the subnets will have the following number of hosts SubnetA - 23 hostsSubnetB - 50 hostsSubnetC - 2 hostsSubnetD - 6 hostsSubnetE - 10 hostsNow find out the following for each subnet: a) Network ID b) Broadcast address c) First usable IP address d) Last usable IP address e) Subnet mask Here, while solving the question make sure you are saving IP addresses. For example, SubnetA needs 23 hosts so in SubnetA you can allocate maximum 30 hosts. Follow the table for all the allowed number of hosts and required number of host bits for each subnet: Name of Subnet Maximum number hosts you can allocate Length of Host bits in the IP address cannot exceed SubnetA 30 5-bits SubnetB 62 6-bits SubnetC 2 2-bits SubnetD 6…
Your host 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 will generate an SMTP dialogue, consisting of SMTP commands and mail, between the remote user and the SMTP server on your host. Assume that a user on your host tries to send packets for this scenario as shown: Scenario Direction Src Addr Dest Addr Protocol Dest Port Action 1 In 192.168.3.4 172.16.1.1 TCP 25 ? 2 Out 172.16.1.1 192.168.3.4 TCP 1234 ? Rule table: Rule Direction Src Addr Dest Addr Protocol Dest Port Action A In External Internal TCP 25 Permit B Out Internal External TCP > 1023 Permit C Out Internal External TCP 25 Permit D In External Internal TCP > 1023 Permit E Either Any Any Any Any Deny Indicate which packets are permitted or denied, and which rule is used in each case.
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Please written by computer source Write a Snort rule to detect a connection attempt on the telnet server which has an IP address 192.168.32.129 and generate alerts for packets with content ‘Telnet!’ directed to the server.
Server Host A SYN Seq 0 SYN JACK Seq=0, ACK=1 ACK Seq, ACK Seq=? ACK=? 170 bytes Get Req Seq and ACK values are: a. Seq=1, ACK=0 b. None is true. c. Seq=0, ACK=1 d. Seq=0, ACK=0 e. Беq-1, ACK-1 С.
0. AS1 has the following routing table, draw the network of AS’s that these paths imply: prefix path P1 AS2 P2 AS4 AS5 AS3 P1 AS4 AS2 P2 AS5 AS3 P1 AS5 AS2 Assuming AS 1 accepted all the paths advertised to it, what paths does AS4 advertise to AS1? What AS is P1 in? What about P2? AS5 no longer wants to forward packets destined for prefix P1 on behalf of AS1, but it is ok forwarding prefix P2, how would it change the paths it advertises to AS1? If AS1 sends a packet to AS4 destined for P1, what path will it take? How do we know AS4 won’t forward it back to AS1? If AS1 gets the following advertisement from AS4, P1 AS4 AS1 AS2 how would it update its table? Why? NOTE: I would appreciate it if the solutions of the paths were hand-drawn so I can visualize it better.
The following packet was generated by snort.. [**] [1:491:8] INFO FTP Bad login [**] [Classification: Potentially Bad Traffic] [Priority: 2] 04/25-08:24:53.007701 192.168.202.16:21 -> 192.168.202.19:46217 TCP TTL:64 TOS:OxO ID:50316 IpLen:20 DgmLen:74 DF ***AP*** Seq: O×52A35467 Ack: O×4E8DE79E Win: 0x39 TcpLen: 32 TCP Options (3) => NOP NOP TS: 85758994 127601244 Please answer the following questions based on the above packet data .. Q1. What is the Source IP address? Q2. What is the Destination IP address Q3. Based on your information above and the 4-tuple, what type of server is this ? Q4. What is the IP identification number? Q5. What is the SID that trigger this rule? Q6. What is the revision of the rule?