Which filter will he use to view the traffic?

Sam, a network administrator is using Wireshark to monitor the network traffic of the organization. He wants to detect TCP packets with no flag set to check for a specific attack attempt.

Which filter will he use to view the traffic?
A . Tcp.flags==0x000
B . Tcp.flags==0000x
C . Tcp.flags==000×0
D . Tcp.flags==x0000

View Answer

Answer: A

Explanation:

In Wireshark, the filter tcp.flags==0x000 is used to detect TCP packets with no flags set. TCP flags are used to indicate the state of a TCP connection or provide additional information to the receiving party. Common flags include SYN, ACK, RST, FIN, among others. A packet with no flags set (represented as 0x000) could be indicative of a network anomaly or a specific type of attack, such as a reconnaissance or scanning attack. It’s important for network administrators like Sam to monitor such packets as they could signify malicious activity on the network.

Reference: The explanation is based on standard TCP/IP protocol behavior and the usage of Wireshark filters, which is consistent with the Network Defender (CND) curriculum that covers network monitoring and analysis tools. The reference to the filter syntax comes from the Wireshark documentation and common networking practices.