Pass with professional ECSAv8 actual quiz materials

Which of the following methods is used to perform server discovery?

• A. SQL Injection
• B. Whois Lookup
• C. Session Hijacking
• D. Banner Grabbing

Passwords protect computer resources and files from unauthorized access by malicious users. Using passwords is the most capable and effective way to protect information and to increase the security level of a company.
Password cracking is the process of recovering passwords from data that have been stored in or transmitted by a computer system to gain unauthorized access to a system.

Which of the following password cracking attacks tries every combination of characters until the password is broken?

• A. Brute-force attack
• B. Hybrid attack
• C. Rule-based attack
• D. Dictionary attack

The IP protocol was designed for use on a wide variety of transmission links. Although the maximum length of an IP datagram is 64K, most transmission links enforce a smaller maximum packet length limit, called a MTU.
The value of the MTU depends on the type of the transmission link. The design of IP accommodates MTU differences by allowing routers to fragment IP datagrams as necessary. The receiving station is responsible for reassembling the fragments back into the original full size IP datagram.
IP fragmentation involves breaking a datagram into a number of pieces that can be reassembled later. The IP source, destination, identification, total length, and fragment offset fields in the IP header, are used for IP fragmentation and reassembly.

The fragment offset is 13 bits and indicates where a fragment belongs in the original IP datagram. This value is a:

• A. Multiple of eight bytes
• B. Multiple of four bytes
• C. Multiple of six bytes
• D. Multiple of two bytes

TCP/IP model is a framework for the Internet Protocol suite of computer network protocols that defines the communication in an IP-based network. It provides end-to-end connectivity specifying how data should be formatted, addressed, transmitted, routed and received at the destination. This functionality has been organized into four abstraction layers which are
used to sort all related protocols according to the scope of networking involved.

Which of the following TCP/IP layers selects the best path through the network for packets to travel?

• A. Internet layer
• B. Application layer
• C. Transport layer
• D. Network Access layer

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?

• A. 32 bits
• B. 8 bits
• C. 24 bits
• D. 16 bits