4.3-2a Network Address Translation (a). 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? S: NAT translation table WAN side addr LAN side addr 138.76.29.7, 5051 10.0.0.1, 2020 ****** S: D: 10.0.0.1

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
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**4.3-2a Network Address Translation (a):**

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?

**Diagram Explanation:**

- **NAT Translation Table:**
  - WAN side addr: 138.76.29.7, 5051
  - LAN side addr: 10.0.0.1, 2020

- **Network Diagram:**
  - The diagram shows three computers within a local network (10.0.0.1, 10.0.0.2, 10.0.0.3) connected to a router.
  - The router has a WAN IP of 138.76.29.7.

  - At point A:
    - Source IP: 10.0.0.1
    - Destination IP: 10.0.0.4 (the router or gateway to the external network)

**Dropdown Explanation:**

- Possible selections for source IP address:
  - 138.76.29.7
  - 10.0.0.1
  - 128.119.40.186

- Possible selections for destination IP address:
  - 80
  - 10.0.0.4

- Possible selections for source and destination port numbers:
  - 2020
  - 5051

**Task:**

You are required to choose the correct source IP address, destination IP address, source port number, and destination port number based on the scenario and diagram provided.
Transcribed Image Text:**4.3-2a Network Address Translation (a):** 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? **Diagram Explanation:** - **NAT Translation Table:** - WAN side addr: 138.76.29.7, 5051 - LAN side addr: 10.0.0.1, 2020 - **Network Diagram:** - The diagram shows three computers within a local network (10.0.0.1, 10.0.0.2, 10.0.0.3) connected to a router. - The router has a WAN IP of 138.76.29.7. - At point A: - Source IP: 10.0.0.1 - Destination IP: 10.0.0.4 (the router or gateway to the external network) **Dropdown Explanation:** - Possible selections for source IP address: - 138.76.29.7 - 10.0.0.1 - 128.119.40.186 - Possible selections for destination IP address: - 80 - 10.0.0.4 - Possible selections for source and destination port numbers: - 2020 - 5051 **Task:** You are required to choose the correct source IP address, destination IP address, source port number, and destination port number based on the scenario and diagram provided.
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