Free Access to ISACA.CISA.v2024-03-31.q980 with Valid Practice Test (Page 159)

Question 786

Which of the following is the BEST indicator that an application system's agreed-upon level of service has been met?

A.Bandwidth usage logs
B.Transaction response time
C.CPU utilization reports
D.Security incident reports

Question 787

An internal audit department recently established a quality assurance (QA) program. Which of the following
activities is MOST important to include as part of the QA program requirements?

A.Ongoing monitoring of the audit activities
B.Analysis of user satisfaction reports from business lines.
C.Feedback from internal audit staff
D.Long-term internal audit resource planning

Question 788

Which of the following is the INCORRECT Layer to Protocol mapping used in the DOD TCP/IP model?

A.Application layer - Telnet
B.Transport layer - ICMP
C.Internet layer - IP
D.Network Access layer - Ethernet

Correct Answer: B

Explanation/Reference:
The keyword INCORRECT is used within the question. You need to find out the incorrect Layer to Protocol mapping.
The ICMP protocol works at Internet layer of the DoD TCP/IP model, not at the Transport Layer.
For your exam you should know below information about the TCP/IP models:
Network Models

Layer 4. Application Layer
Application layer is the top most layer of four layer TCP/IP model. Application layer is present on the top of the Transport layer. Application layer defines TCP/IP application protocols and how host programs interface with Transport layer services to use the network.
Application layer includes all the higher-level protocols like DNS (Domain Naming System), HTTP (Hypertext Transfer Protocol), Telnet, SSH, FTP (File Transfer Protocol), TFTP (Trivial File Transfer Protocol), SNMP (Simple Network Management Protocol), SMTP (Simple Mail Transfer Protocol) , DHCP (Dynamic Host Configuration Protocol), X Windows, RDP (Remote Desktop Protocol) etc.
Layer 3. Transport Layer
Transport Layer is the third layer of the four layer TCP/IP model. The position of the Transport layer is between Application layer and Internet layer. The purpose of Transport layer is to permit devices on the source and destination hosts to carry on a conversation. Transport layer defines the level of service and status of the connection used when transporting data.
The main protocols included at Transport layer are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).
Layer 2. Internet Layer
Internet Layer is the second layer of the four layer TCP/IP model. The position of Internet layer is between Network Access Layer and Transport layer. Internet layer pack data into data packets known as IP datagram's, which contain source and destination address (logical address or IP address) information that is used to forward the datagram's between hosts and across networks. The Internet layer is also responsible for routing of IP datagram's.
Packet switching network depends upon a connectionless internetwork layer. This layer is known as Internet layer. Its job is to allow hosts to insert packets into any network and have them to deliver independently to the destination. At the destination side data packets may appear in a different order than they were sent. It is the job of the higher layers to rearrange them in order to deliver them to proper network applications operating at the Application layer.
The main protocols included at Internet layer are IP (Internet Protocol), ICMP (Internet Control Message Protocol), ARP (Address Resolution Protocol), RARP (Reverse Address Resolution Protocol) and IGMP (Internet Group Management Protocol).
Layer 1. Network Access Layer
Network Access Layer is the first layer of the four layer TCP/IP model. Network Access Layer defines details of how data is physically sent through the network, including how bits are electrically or optically signaled by hardware devices that interface directly with a network medium, such as coaxial cable, optical fiber, or twisted pair copper wire.
The protocols included in Network Access Layer are Ethernet, Token Ring, FDDI, X.25, Frame Relay etc.
The most popular LAN architecture among those listed above is Ethernet. Ethernet uses an Access Method called CSMA/CD (Carrier Sense Multiple Access/Collision Detection) to access the media, when Ethernet operates in a shared media. An Access Method determines how a host will place data on the medium.
IN CSMA/CD Access Method, every host has equal access to the medium and can place data on the wire when the wire is free from network traffic. When a host wants to place data on the wire, it will check the wire to find whether another host is already using the medium. If there is traffic already in the medium, the host will wait and if there is no traffic, it will place the data in the medium. But, if two systems place data on the medium at the same instance, they will collide with each other, destroying the data. If the data is destroyed during transmission, the data will need to be retransmitted. After collision, each host will wait for a small interval of time and again the data will be retransmitted.
Protocol Data Unit (PDU) :
Protocol Data Unit - PDU

The following answers are incorrect:
The other options correctly describes the Layer to Protocol mapping of the DoD TCP/IP model protocols.
The following reference(s) were/was used to create this question:
CISA review manual 2014 page number 272

Question 789

A control that detects transmission errors by appending calculated bits onto the end of each segment of data is known as a:

A.reasonableness check.
B.parity check.
C.redundancy check.
D.check digits.

Question 790

The waterfall life cycle model of software development is BEST suited for which of the following situations?

A.The protect requirements are wall understood.
B.The project is subject to time pressures.
C.The project intends to apply an object-oriented design approach.
D.The project will involve the use of new technology.

Correct Answer: A

Explanation
The waterfall life cycle model of software development is best suited for situations where the project requirements are well understood. The waterfall life cycle model is a sequential and linear approach to software development that consists of several phases, such as planning, analysis, design, implementation, testing, and maintenance. Each phase depends on the completion and approval of the previous phase before proceeding to the next phase. The waterfall life cycle model is best suited for situations where the project requirements are well understood, as it assumes that the requirements are clear, stable, and fixed at the beginning of the project, and do not change significantly throughout the project. The project is subject to time pressures is not a situation where the waterfall life cycle model of software development is best suited, as it may not be flexible or agile enough to accommodate changes or adjustments in the project schedule or timeline. The waterfall life cycle model may involve long delays or dependencies between phases, and may not allow for early feedback or delivery of software products. The project intends to apply an object-oriented design approach is not a situation where the waterfall life cycle model of software development is best suited, as it may not be compatible or effective with the object-oriented design approach. The object-oriented design approach is a technique that models software as a collection of interacting objects that have attributes and behaviors. The object-oriented design approach may require iterative and incremental development methods that allow for dynamic and adaptive changes in software design and functionality. The project will involve the use of new technology is not a situation where the waterfall life cycle model of software development is best suited, as it may not be able to cope with the uncertainty or complexity of new technology. The waterfall life cycle model may not allow for sufficient exploration or experimentation with new technology, and may not be able to handle changes or issues that arise from new technology.

Question 786

Question 787

Question 788

Question 789

Question 790

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