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Message repudiation means a user can validate which mail server or servers a message was passed through.

Message repudiation means a user can claim damages for a mail message that damaged their reputation.

Message repudiation means a recipient can be sure that a message was sent from a particular person.

Message repudiation means a recipient can be sure that a message was sent from a certain host.

Message repudiation means a sender can claim they did not actually send a particular message.

The packets were sent by a worm spoofing the IP addresses of 47 infected sites

ICMP ID and Seq numbers were most likely set by a tool and not by the operating system

All 77 packets came from the same LAN segment and hence had the same ICMP ID and Seq number

13 packets were from an external network and probably behind a NAT, as they had an ICMP ID 0 and Seq 0

This is not a spoofed packet as the IP stack has increasing numbers for the three flags.

This is back orifice activity as the scan comes from port 31337.

The attacker wants to avoid creating a sub-carrier connection that is not normally valid.

There packets were created by a tool; they were not created by a standard IP stack.

A reset will be returned

An ICMP message will be returned

The four-way handshake will not be completed

An RFC 1294 message will be returned

Nothing