Attackers frequently use ACK scans to circumvent a firewall or other filtering tools. During a NULL scan, all packet flags are enabled. The most recent versions of Nessus Server and Client are compatible with Windows, Mac OS X, FreeBSD, and the vast majority of Linux variants.
<h3>What is ack scan ?</h3>
- ACK scans are used to identify hosts or ports that have been blocked or are resistant to other types of scanning. An attacker uses TCP ACK segments to learn about firewall or ACL configuration.
- Attackers probe our router or send unsolicited SYN, ACK, and FIN requests to specific UDP/TCP ports.
- TCP ACK Scan sends an ACK message to the target port to determine whether or not it is filtered.
- On unfiltered ports, a RST reply packet will be sent for both open and closed ports. Filtered ports will either generate no response or generate an ICMP reply packet with an unreachable destination.
- The TCP ACK scanning technique attempts to determine whether a port is filtered by using packets with the ACK flag set.
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Answer:
1. open the software
2. select a new blank database or database wizard
3. name the database
4. enter field names and select the type of field (text, number, date, currency)
5. make one of the fields the primary key
6. click done, or save and close
7. open the table and add records
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Answer:
snap
Explanation:
The line which appears when we are dragging an object of GUI on a object of windows Form indicates that the object that is being dragged is aligned horizontally with the object which is connected by the blue line is called a snap line.
Hence we conclude that the answer to this question is snap line.
