QUESTION: 61

Transmission control protocol accepts data from a data stream, divides it into chunks, and adds a TCP header creating a TCP segment.
The TCP header is the first 24 bytes of a TCP segment that contains the parameters and state of an end-to-end TCP socket. It is used to track the state of communication between two TCP endpoints.
For a connection to be established or initialized, the two hosts must synchronize. The synchronization requires each side to send its own initial sequence number and to receive a confirmation of exchange in an acknowledgment (ACK) from the other side.

The below diagram shows the TCP Header format:

How many bits is a acknowledgement number?

16 bits
32 bits
8 bits
24 bits

Answer(s): B

Reference:

http://en.wikipedia.org/wiki/Transmission_Control_Protocol (acknowledgement number)

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QUESTION: 62

Which one of the following commands is used to search one of more files for a specific pattern and it helps in organizing the firewall log files?

grpck
grep
gpgv
gprn

Answer(s): B

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QUESTION: 63

A penetration test consists of three phases: pre-attack phase, attack phase, and post-attack phase.

Active reconnaissance which includes activities such as network mapping, web profiling, and perimeter mapping is a part which phase(s)?