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:
Computer can be classified into four categories based on size namely Micro, Mini, Mainframe and Super computer
Explanation:
Answer:
) In computers and computer networks, a configuration often refers to the specific hardware and software details in terms of devices attached, capacity or capability, and exactly what the system is made up of.
Explanation:
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Answer:
D is the suitable answer.
Explanation:
All of the above
Answer:
a.) Incoming packets can be placed in the buffer and played back without the jitter.
b.) Buffering would increase the latency because there would be a delay in time when the packets enter the buffer and the time is released.
Explanation:
Jitter is referred technically as a packet delay variations.
It is variation in the periodicity of periodic events or a signal from target or the true frequency.
