What is the size in bytes of the TCP sequence number in the header?
Answer(s): D
In the Transmission Control Protocol (TCP) header, the sequence number field is crucial for ensuring the correct sequencing of the packets sent over a network. The sequence number field in the TCP header is 32 bits long, which equates to 4 bytes. This sequence number is used to keep track of the bytes in a sequence that are transferred over a TCP connection, ensuring that packets are arranged in the correct order and data integrity is maintained during transmission.ReferencePostel, J., "Transmission Control Protocol," RFC 793, September 1981."TCP/IP Guide," Kozierok, C. M., 2005.
Which mode within IPsec provides a secure connection tunnel between two endpoints AND protects the sender and the receiver?
Answer(s): B
IPsec (Internet Protocol Security) has two modes: Transport mode and Tunnel mode. Tunnel mode is used to create a secure connection tunnel between two endpoints (e.g., two gateways, or a client and a gateway) and it encapsulates the entire IP packet. This mode not only protects the payload but also the header information of the original IP packet, thereby providing a higher level of security compared to Transport mode, which only protects the payload.ReferenceKent, S. and Seo, K., "Security Architecture for the Internet Protocol," RFC 4301, December 2005."IPsec Services," Microsoft TechNet.
Which of the following can be used to view entire copies of web sites?
Answer(s): A
The Wayback Machine is an internet service provided by the Internet Archive that allows users to see archived versions of web pages across time, enabling them to browse past versions of a website as it appeared on specific dates.It captures and stores snapshots of web pages, making it an invaluable tool for accessing the historical state of a website or recovering content that has since been changed or deleted. Other options like Google Cache may also show snapshots of web pages, but the Wayback Machine is dedicated to this purpose and holds a vast archive of historical web data.ReferenceInternet Archive: https://archive.org"Using the Wayback Machine," Internet Archive Help Center.
The NIST SP 800-53 defines how many management controls?
NIST SP 800-53 is a publication that provides a catalog of security and privacy controls for federal information systems and organizations and promotes the development of secure and resilient federal information and information systems.According to the NIST SP 800-53 Rev. 5, the framework defines a comprehensive set of controls, which are divided into different families. Among these families, there are specifically nine families categorized under management controls. These include categories such as risk assessment, security planning, program management, and others.Reference"NIST Special Publication 800-53 (Rev. 5) Security and Privacy Controls for Information Systems and Organizations."NIST website: https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-53r5.pdf
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