A user types ssh someserver.example.com, but the ssh program hangs without producing any output. What is least likely to be the problem?

a. the network is extremely congested

b. the users ISP is blocking outbound connections to port 22

c. the servers ISP is blocking inbound connections to port 22

d. the servers host firewall is blocking inbound connections to port 22

e. the servers TCP RST messages keep causing the client to continuously reset and retry making the connection

10. What error message would most likely occur when attempting to connect to port 80 of a public-facing server that has no HTTP daemon running on that port?

a. Network unreachable.

b. HTTP/404 - file not found.

c. Broken pipe.

d. Connection refused.

e. Unknown host.

11. A programmer instructs a program to open a listening socket on port 20000, but the program instead listens on port 8270. What went wrong? Hint: 20000 in hexadecimal is 4E20, while 8270 in hexadecimal is 204E.

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