NAT and routing

Questions 1 to 5 of 8

1. 1. Ana's laptop is 192.168.1.20. It opens a connection from its port 51514 to a web server at 198.51.100.10 port 443. The router has no earlier rows. Which source address does the server see on the packet?

   192.168.1.20:51514198.51.100.10:443203.0.113.7:51514203.0.113.7:40000
2. 2. A stranger sends a packet to public port 40000 on the router. The table has no row for that port, and no port forwarding rule matches it. What happens?

   The router drops the packet without sending any replyThe router sends an error message back to the strangerThe router forwards it to the last laptop that used port 40000The router holds the packet until a laptop starts a connection
3. 3. Fill in the blank. The router's table of connections, which records each address rewrite, is called the ___ table.

   Type your answer.

4. 4. Ana wants to show her test site to a friend. She runs this on her laptop, and adds the router rule below. Her friend types http://203.0.113.7:8080 and gets Connection refused. Which part is the bug? ``text # on the laptop python3 -m http.server 8000 --bind 127.0.0.1 # router settings public port 8080 -> 192.168.1.20, laptop port 8000 ``

   The http.server command needs to use port 8080The rule should forward to port 443 instead of port 8000The server binds to 127.0.0.1, so it refuses packets that arrive at the home-network addressThe public address 203.0.113.7 is wrong, and the laptop address should be typed instead
5. 5. Fill in the blank. A friend's error says ___ when the packet reached the laptop but no program listens on that port. Write the two words of the error.

   Type your answer.