Question

You are experiencing issues when trying to transfer files between two computers using FTP. What could be the potential cause(s) of the issue? Select all that apply.

	Server is not able to resolve the client IP address
	Inbound port UDP 21 is blocked in the server
	The remote host does not allow connections on high ports 49152 - 65535
	Inbound port TCP 21 is blocked in the server
	Client is not able to resolve the remote IP address

Which of the following best describes the function of the TTL/hop limit for IP packages?

	Prevents a computer from keeping the same IP forever, which could potentially cause IP address conflicts in the network (perhaps due to incorrect DHCP configuration)
	Tells the client for how long it should cache the local ephemeral port used in a TCP connection to allow fast reconnections
	Indicates to the server for how long it should keep a TCP connection with a specific client to mitigate denial-of-service (DoS) attack
	Prevents IP packets from getting stuck in infinite routing loops (perhaps due to incorrect routing tables)

Answer 1

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You are experiencing issues when trying to transfer files between two computers using FTP. What could be the potential cause(s) of the issue?

• Server is not able to resolve the client IP address
• Inbound port TCP 21 is blocked in the server
• Client is not able to resolve the remote IP address

These three reasons are possible of the issue in not transfering the files between the two computers, as FTP does not uses UDP and remote high number ports hardly matters

Which of the following best describes the function of the TTL/hop limit for IP packages?

• Tells the client for how long it should cache the local ephemeral port used in a TCP connection to allow fast reconnections

TTL or hop limits are been used to identify the tile till which the packet will be alive and after that time is over it's needed to be retransmitted.

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