Operating System Questions and Answers May 17, 2021

Given the following situations, list any log files or commands that you would use when collecting information during the troubleshooting process. 1. A USB device that worked previously with Linux does not respond to the mount command. 2. The system was unable to mount the /home filesystem (/dev/sda6). 3. A new database application fails to start

Explain the path an inbound ping request packet from 123.45.67.89 would take from VyOS-1 eth0 on into the network and the response the Linux CLI would generate back out until VyOS-1 eth0. At each point necessary, list the route table and the decision that would be made based on it.

Configure Manual IP address on your Linux Virtual Machine by modifying the network script file for the enp0s3 interface as follows: IPv4: 192.168.x.1 Netmask: 255.255.255.0 Gateway: 192.168.x.254 DNS: 192.168.x.1 X=the last 2 digits of your student ID. If the digits are 01 then use 101 or 02 use 102 etc.

Where there is no network connection to a client machine from a Linux Storage Server; please explain in detail the steps you would do to troubleshoot to resolve in order.

The Linux user needs to transfer the system file to another directory but he is unsuccessful in transferring files. He verifies that there is no problem with command and syntax. What is the most likely cause to this unsuccessful transfer of the file and specify how are you going to fix this issue? You're a Linux administrator, there's a problem

Share the network printer and connect to it from your Linux computer. Research the requirements to share the printer on the Windows 10 computer and then find out how to connect to it from a Linux computer. Then, if possible, perform the necessary steps. Answer the following questions: Discussion Questions a. What did you do to share the printer on

Three departments in your company --Accounting, Advertising, and Engineering--have been running in their own workgroup environments for a number of years. Engineering runs a Linux Fedora Core 4 network with 10 Linux computers. The Advertising department uses LocalTalk, which is built into its Macintosh computers. Accounting uses Windows XP to

How do I configure a service to start on system reboot (service is said to be persistent through reboot)? How do Install and uninstall a program in Kali Linux the (non-source..no compiling necessary). How do I display the list of network interfaces in kali Linux (what command is used)?

Several of your users want to use Linux at home but are confused by firewall rules and how to manage a firewall. What tool can you recommend to help them configure their firewalls Uncomplicated Firewall (UFW) Firewall zones IP sets Intrusion Prevention Systern (IPS)

Assuming that the software library for application that contain tls and ssl protocols to secure communications over computer networks is not installed in your linux debian machine ,what is the command used to install it?

Explain how files on the network may be accessed by Marvel. Make sure you cover how both windows and linux can access the same shared files. Explain how Marvel can securely share files from a central location within their group and other selected groups/users in the company. How will central authentication be handled in the Linux environment. How

Write a program that first reads in the name of two input files; input1pass.txt and input1shadow.txt. These files will contain encrypted and non-encrypted passwords to simulate a Brute Force approach. Next the program will accept input of two strings representing a potential user name, and password. The files should be read using the

Nishida Kitchens is a medium-sized company that makes packaged Japanese foods including noodle and sauce combinations. Their foods are distributed to grocery stores and specialty food stores throughout Canada, Europe, and the United States. The company is moving into a new building and has hired Network Design Consultants to help them create a new

Suppose, you are working in an organization as a network administrator. There is a virus attack on the organization's serva incoming traffic on the server. Write the necessary Linux commands to block all types of traffic.

The Linux security model is based on the one used on UNIX systems, and is as rigid as the UNIX security model and sometimes even more, which is already quite robust. The purpose of this assignment is to implement and demonstrate your ability to create a protected and robust filesystems administration by managing the permission and accessing of

Describe how you would kill a run-away process? What you always should check before assigning a static IP address? Can you describe a world if no network encryption would be available today?

You've used the rpm command with the -V option to verify an RPM package installed on your system. The output from the command listed the following error code: What does the error code below indicate? 2. What does the configure script do in an application's installation directory? 3. Which runlevels use a command-line user interface by default? 4.

Describe, with the aid of one or more diagrams, the Completely Fair Scheduler used in the Linux Kernel to schedule processes. Explain how it implements the Weighted Fair Queuing mechanism for queued processes.

Demonstrate a command to add a new user named Yellow Dog with user name ydog to your Linux system. What are the various accommodations that must be set up for this new user? As a privileged or root user, what is the best/safest command to shutdown a system by command line. From the Linux distribution of your choice, provide the network

What will be installed on your computer after running mininetutilinstall.shfnv command Mininet o Open vswitch Wireshark a and b

What is the name of the open source blockchain technology to which IBM is contributing code? Linux Foundation Hyperledger IBM Blockchain Linux Foundation Hyperledger Fabric IBM Hyperledger What is a smart contract? Business rules implied by the contract embedded in blockchain A cognitive contract A legal contract written in constrained English

What command may be used to prevent packets from the 3.0.0.0/8 network from being routed through your Linux router? iptables-A FORWARD-s 3.0.0.0/8-j REJECT iptables-A INPUT-s 3.0.0.0/8 -j REJECT iptables-A INPUT-s 3.0.0.0/8 -m REJECT iptables-A FORWARD-s 3.0.0.0/8-m REJECT

If the DHCP service is not available, which service will provide a dynamic IP address for a machine? IP route Default gateway service APIPA DNS What is a difference between the output of ifconfig and ipconfig? ipconfig only works on a Windows operating system. ifconfig does not show the default gateway. ifconfig only works on a Macintosh computer.

For the Network Security Module Assignment research and find 2 different remote log monitoring solutions which support both Windows and Linux clients. There are some examples in the lecture, but there are many many others available to use. Note: looking at local syslogs will not count as a "log monitoring solution." These solutions must be able to

Write the python code needed to connect to 102 router and write to a file named interfaces txt a list of all the network interfaces Write the python code needed to connect to 102 and write the traffic information/data for all network interfaces. Create individual files for each network interface. Each text file should contain data about the

After several years as a successful architectural firm in Southern California, Green Design decided to expand by adding two new business ventures: a civil engineering projects group, and a group for commercial building projects. As a senior systems analyst, you have been asked to study the situation and make recommendations. Requirements: Should

Assume that your company uses the Class A network 100.0.0.0/8, with what subnet mask would you need to configure all computers on the network to divide this network 11 times to match the company's 11 departments? How many hosts can you have per network? What are the first five ranges of addresses that you can assign to different departments?

As the Linux system administrator, it's your responsibility to ensure that the company network is secure, and the tool of choice for checking application security is Novell AppArmor. Describe the steps you should take to make sure Novell AppArmor is installed along with all available updates.

What is the command to change the configuration of a network interface named "eth0" to 128.168.230.2/16? What are the steps required to configure a network interface within a virtual machine to have access to the internet through your host PC? Hint: Consider the configuration of both VirtualBox and inside your virtual machine

Some Microsoft officials are concerned about the growing popularity of Linux because: Its better word processor than Microsoft word It could offer stiff competition to the Windows NT operating system It provides faster Internet service than The Microsoft Network

1. How would you insert audio into your presentation? (Clearly list the steps to insert audio) 2. Give one example of why you would insert audio into a presentation. Clearly state your example.

Kali Linux contains many tools that can be used for security testry. Show a command that you could use in a Terminal window in Kak Linux to find all active Web servers on a network. with address 192.16 d.1.0 and netmask 255.255.255.0. Assume the Kali Linux system is connected is that network whet address 192.168.1.90. Describe the response you

Discuss how the security scheme in Linux allows a high level of security even without network security. Moreover, it can serve files on a need-to-know basis and protect sensitive data such as home directories and system configuration files.

What is the dominant file-sharing protocol used by Windows and supported by Linux and MAC OS? a. File Sharing Protocol (FSP) b. Server Message Block (SMB) c. Network File System (NFS) d. Secure File Transfer Protocol (SFTP

Write a note on the Facebook outage on October 4, 2021. What was the actual reason behind this massive outage. Discuss some linux commands to Check DNS, Routing Table, and other network configuration commands with syntax and example.

Which one has more attack surface for an unprivileged attacker who is in the same network with the target computers? Explain. 1. Ten Windows 7 computers with ports 135, 137, 138, 139, and 445 are open. 2. One Red Hat Enterprise Linux that has 15 ports open, One Windows 2018 server that has 10 ports open.

Securing a system is an important part of managing a production system. While many of the tasks associated with creating users and groups leads to a secure local system, there are still risks associated with running a system both external over the network and internally on the local system. Discuss the issues surrounding local security on a Linux

How you can check running network services in Linux System? What security related commands are usable with yum updateinfo? Why keeping Linux system up to date is important from security point of view? What security risks BYOD can pose for companies? The company in which you work wants to implement Mobile Device Management (MDM). As a security

The permissions on the linux file /etc/shadow is set so that it cannot be read by unprivileged users. Why? When is it best to use a host firewall (e.g. ufw)? When is it best to use a network firewall (e.g. pfSense).

What would be (what would it look like) if the Linux ufw syntax were used for allowing the access of all incoming traffic from all nodes in the 192.168.1.0/24 network to the HTTP port 80 and to the FTP port 21?Explain

Does Linux differ from Unix No, Unix and Linux are exactly the same, both are free. Yes, Linux is a clone of Unix. Linux is free, but Unix is not. No, Linux and Unix are both commerical and paid software No, Linux and Unix are both exactly the same.

List and describe the steps needed to assign IP addresses to the Linux ports and show the commands needed to test the communication with the rest of the network. List the possible outcome of the ping command and explain why you may experience each one of them after you attempt pinging other computers on the network. You can write about the

How are applications defined in TCP/IP? Mention the most basic tools for testing a TCP/IP connection from a source computer to reach a specified destination computer?

You are a security professional. You have been asked to develop strategies to protect data and file systems in a small Linux environment. The environment contains a Linux application server, a Linux web server, and 30 workstations and laptops. Several users connect to the network from their personal mobile devices. How would you develop a layered

The program in Figure displays the network configuration of the current machine by using the exec() family of functions. The command to display the network configuration on Linux and Mac machines is sbinifconfig. On Windows, the equivalent command is ipconfig that is stored somewhere on the command path. Complete the missing parts of the program

Which of the following is NOT true about the method process.on() a. It launches the server. b. It is a signal handling method. O c. It is a global object in Node.js that is available from anywhere, and it allows us to manipulate the existing process. O d. It allows us to specify what to do with some of the familiar standard UNIX system signals.

The Unix operating system was pioneered by Ken Thompson and Dennis Ritchie at Bell Laboratories in the late 1960s. One of the primary goals in the design of the Unix system was to create an environment that promoted efficient program development. 1-Write the grep command to output all lines that begin with an uppercase T. 2-Write the grep command

Write a minimal vi command to replace all occurrences of all the words tex and miktex with LaTeX in an open text file. Note that tex and miktex might start with capital letters, or might be entirely in uppercase. Use grep to find lines in a text file that contain at least one of the following compute, Compactor, computation But must not contain

Write a program in C for a UNIX system that meets the following conditions program requirements. The program must create parent and child processes with fork() and use the stat() function to determine file permissions.

The expression sum sum 10 can be written as sum 10 sum 10 Osum sum 10 sum 10,The login user name of the UNIX system at Norfolk State University is Your last name The first 4 letter of your last name and the last 4 digits of your student ID The first 4 letter of your first name and the last 4 digits of your student ID The lower case s

Write the octal equivalents for the following binary numbers:100,111,101,011, and 010. Write how to express*nix owner permissions of r-x in binary (Remember that the -symbol means the permission isnt granted.) Whats the octal representation of the binary number you calculated? (The range of numbers expressed in octal is 0 to7. Because*nix has

In accepting the ACM Turing Award, Ken Thompson described a devious Trojan horse attack on a Unix system, which most people now refer to as Thompson's rigged compiler. This attack changes the binary version of the login program to add a backdoor, say, to allow a new user, 12345, that has password, 67890, which is never checked against the

What type of data must be collected before shutting down a compromised networked device a list of the processes running on the computer a list of files in the Recycle Bin the files in the temporary Internet Files cache any temporary application Which aspect of security is concerned with preventing the unauthorized modificatio information? 4.

Consider the Scheme expression ( < a b), where a and b are footing point values Thin expression in supposed to test whether a is smaller than .Does this expression contain an witor? fr so, what is that error In the context of aake programming, what is a "phony target"? What is one feasino phony target maty appear in maketslea? What is one way of

Consider a file MyNotes.txt on a Unix system that user Alice created and that she currently owns. The file is a file of text notes taken during an interview. User Bob should own the file from now on and have full access to it as appropriate. User Charlie should only have read access. Users Donna and Eve should not be able to access the file for

Write the program in C. Create your own fgets() and fputs() using only Unix system calls such as open, read, write, close etc, so no standard input/outputs functions are allowed.

Using only the Unix inputoutput system calls(do not use any standard inputoutput functions), define two C functions, called myFgets() and myFputs() with the following requirements int myFgets(char s, int size, int stream) reads in at most one less than size characters from stream (file descriptor is stream) and stores them into the buffer pointed

Measuring the cost of a context switch is a little trickier. The lmbench benchmark does so by running two processes on a single CPU, and setting up two UNIX pipes between them; a pipe is just one of many ways processes in a UNIX system can communicate with one another. The first process then issues a write to the first pipe, and waits for a read

Write a C or C++ concurrent Shearsort program using basic UNIX system calls for process creation and interprocess communication. You will use system calls such as fork(2), pipe(2), read(2), and write(2) to implement the Shearsort algorithm on multiple UNIX processes (note that the (2) in fork(2) refers to the section number of the man pages where

UNIX systems consider ach file to be a sequence of _______________ A. bit words, which length is defined by the users B. 16 bit words C. 8-bit bytes D. 32 bit words Files _______ is a unique tag identifies the file within the file system. A. type B. location C. identifier D. name Acyclic-graph directory structure_______________________ A.

What do the following commands do? Explain in detail. a. cat # ie when you type carriage return after typing cat b. chmod -R 700 $HOME (2) Identify command options and arguments in the following $ ls -a -r /tmp /usr . $ fold -80 /etc/passwd > /tmp/passwd $ uname -S amazon $ cat -A /tmp (3) List name(s) of commands available in Unix system for the

Which access type should be used when there is a need for a fast access to massive amounts of data index access indexsequential access direct access sequential access,UNIX systems allow groups to be created and modified by any owner of the file any superuser automatic privilege determination procedures any member of the group

What is the purpose of the nice command in UNIX? Give the sequence of steps (with commands) for terminating a background process. How would you display information about the user chris at the host mit.edu using the finger command?

Write shell program using in C, using various Unix system calls, such as fork , execv , wait , etc. to accomplish the following tasks: Once executed in your home directory, it should switch to your Name%. For example, if your login name is ksmith, /home/ksmith> shell.c /home/ksmith% It can execute the following Unix commands ls , pwd , cd , more ,

Number of sectors per track increases as we move from inner zone to outer zone, because Select one: a. angular velocity of disk rotation can remain constant. b. the drive can decrease its rotation speed as the head moves from the outer to the inner tracks. c. the drive can increase its rotation speed as the head moves from the outer to the inner

From a group of students surveyed, it is determined that 28 students like Chinese food, 25 students like Italian food and 35 students like Mexican food. A total of 15 students like Chinese and Italian food, 20 students like Chinese and Mexican food and 12 students like Italian and Mexican food. A total of 9 students like all 3. ora ( a) How many

1. Display a list of the users who are also using the Unix system now. 2. Display the current date and time. 3. Display the path to your current directory. This ought to be your home directory. 4. Create a directory called unit1. 5. Make unit1 your current working directory. 6. Verify that you are in the unit1 directory by displaying the path to

What type of operating system runs a dedicated electronic device such as a smart thermostat? A. PC operating system B. embedded operating system C. mobile operating system D. network operating system.

An analyst receives artifacts from a recent intrusion and is able to pull domain, IP address, email, and software version. Which of the following points of the Diamond model of intrusion Analysis does this intelligence represent? A. Adversary B. Capabilities C Victims D. infrastructure During an incident investigation, some users discover that all

Which of the following is a potential vulnerability associated with using embedded operating systems? A. an embedded operating system cannot be patched as easily as a traditional operating system B. an embedded operating system requires additional ports and protocols C. An embedded operating system may require several FPGAs during normal operation

Object-oriented design (OOD) uses objects to design programs. To use an object, you do not need to know the makeup of the object. This information might be hidden from you. However, you need to know the functions of the object (such as buttons) and how to use them. You can use an object by itself or with other objects, but you cannot modify the

We here propose a doctor-patient handling, managing system that helps doctors in their work and also patients to book doctor appointments and view medical progress. The system allows doctors to manage their booking slots online. Patients are allowed to book empty slots online and those slots are reserved in their name. The system manages the

When building a State Machine diagram, the three types of states that an object can go through are Pseudo State, Origin state, Destination State Initial State, Internal State, End State Origin State, transfer state, external state Initial State, Middle State, Final State The final step in the objectoriented design (OOD) process consists of

Which of following is considered an object-oriented design model? Use Case Sequence DFDs ERDs a and b a, b, c, and d

Which of the four basic competitive strategies (New market entrants, Substitute products and services, Customers, and Suppliers) best describes Indigo's approach? Explain your reasoning and provide two examples of how Indigo uses or can use information systems and technologies to support that strategy. How effective is Indigo in using information

The waterfall model of system development is characterized by Coding one use case at a time. Using an ObjectOriented design approach. Doing all the analysis before any of the design. Constant user feedback. Developing one use case at a time, from requirements to testing.

The government procurement system can provide bidding procurement for many types of products. The purchasers could publish the purchase information, which specifies the product type. The suppliers could subscribe to the certain product types of purchase demand. Once a new purchase demand is released for that product type, the suppliers can

Use Constructors, Parameters, and arguments as needed. Have the user input number of seconds. Convert number of seconds to days, hours, minutes, and remaining seconds up to 7 days. If the number of seconds is greater than 7 days do not convert and print a message user entered seconds greater than 7 days. Create a main function to control the

Design a program that simulates basic functions of a Bitcoin Exchange. The exchange should offer options to buy and sell bitcoins using the currency deposited by the account holder. User accounts should offer typical features including personal contact information (name, date of birth), coins they own and its current value, information about

1. Discuss the two abstract data structures that have been explored, a stack and a queue, and explain how they differ in their behavior. 2. Explain how a tree structure differs from a list, stack, or queue structure 3. Briefly describe a graph and explain how creating a graph can help to solve classic problems. Provide an example of a classic

Write a program that simulates an Automatic Teller Machine (ATM). Each user will have access to only a checking account. Design your interface to be similar to what you see on your local ATM. Using object-oriented design: You will need to write multiple Python classes to solve this problem. Since debit card swiping is not possible here, instead

Assume you have an Employee class with a non-static attribute named salary. If you create ten objects of this class, how many copies of the salary variable will you have? In the object-oriented design process, what is/are the reason(s) to identify requirements early and keep design changes to a minimum?

You are to build an online computerized telephone book system for a university. The telephone book should contain entries for each person in the university communitystudent, professor, and staff member. Users of the directory can look up entries. In addition, the administrator of the telephone book can, after supplying a password, insert new

In the objectoriented design of an airline passenger reservation program, suppose that airplane seat, aisle seat, and window seat have been identified as classes. Focusing specifically on the aisle seat class, how does it relate to the airplane seat class 1) aisle seat exhibits a hasa relationship with airplane seat. 2) aisle seat exhibits a

Language processing systems used in software engineering architecture to O a. Check semantics. O b. All the answers c. Describe an algorithm or describe the system data. d. Act on the instructions in the language that is being processed.,Patterns are a means of a. representing, sharing, and reusing knowledge. b. include information about when they

Use UML class diagram to model the elevator system of a multi- floors building. The elevator system is composed of 20 floors and n elevators. Each elevator has two doors and a keypad consisting of a set of buttons, one for each floor. The buttons light up when they are pressed. This, in turn, cause the elevator to visit the corresponding floor.

Briefly describe the distinction between requirements and specification. Briefly describe the distinction between specification and architecture. Compare and contrast top-down and bottom-up design 01-7 Provide a concrete example of how bottom-up information from the software programming phase of design may be useful in refining the architectural

An online retailer sells five products whose retail prices are as follows: Product 1, $2.98; product 2, $4.50; product 3, $9.98; product 4, $4.49 and product 5, $6.87. Write an application that reads a series of pairs of numbers as follows: a) product number b) quantity sold

QNO.1.what is operating system?

There are multiple airports all over Africa. The airports each have their own an assigned unique ID. Each airport has multiple Airlines and each airline has different types of planes, pilots and staff members. The planes each have an associated plane number and model number. Each airline has planes assigned to flights to different destinations for

Suppose you had a program where certain work could be done in parallel, and you expect each thread to use 2 GB of RAM. The computer on which you will run the program has 32 GB total RAM, and 8 cores. The other computer is running a typical OS such as Windows or Linux and you have been given permission to run your process on it without any other

Which is not a measure of variability? A) Mean absolute deviation (MAD) B) Range C) Coefficient of variation D) Trimmed mean If Excel's sample skewness coefficient is positive, we conclude that: A) the population is skewed to the right, if the sample size is small. B) the population is symmetric, as long as the sample size is very large. C) the

Explain the terms diffusion and confusion. Explain why diffusion and confusion are desirable properties of symmetric encryption algorithms. For each of the following Feistel Cipher design considerations explain whether it contributes to diffusion, confusion, or both and why The F function The XOR of the first half of the input to the round with

An instructor transforms her students' scores on a midterm into standardized (z) scores. The distribution of standardized scores ___. a. is not necessarily symmetrical b. consists of an infinite number of scores c. has a mean of one standard deviation of the mean d. has a standard deviation of one standard deviation of the mean

A built-up shape that is symmetrical about the y-axis BUT NOT symmetrical about the x-axis consisting of a 3/4 x 18 top flange, a 5/8 x 10 bottom flange and a 3/4 x 60 web is used as a beam (dimensions in inches). A572 Grade 50 is used. Lateral bracing is continuous. What is the Nominal Bending Strength for Flange Local Buckling (FLB)

Design a concrete building that's 15 meters wide, 40 meters long and 8.2 meters high suitable for industrial use. The roof should be pitched, the building symmetric both sides and the slope of each side will be 10%. Column are to be 7 meters high. Footings are to be designed and checked after actions have been calculated. Design your building from

In the frame analysis we want to draw the moment diagram and find the Mix, the maximum moment. The frame has symmetrical lateral pressure of 425kN. Write down all the steps thank you. If data is missing do a hypothesis and use that value for the rest of the calculations. B is a simple support and D is a rolled support. the lateral length of the

425AN. 1000m 45,5m 2,35m I 425AJ 0,78m

In a symmetric multiprocessor (SMP) system with a shared bus, there are two CPUs (CPU1, CPU2) that have local cache memories. The system does not include a shared L2 cache. For write operations, the Write Back (WB) method is used. There is a shared variable A in the system. To provide cache coherence, the snoopy MESI protocol is used. The parts a)

Like how intramolecular aldol condensations can occur in diketones, intramolecular Claisen condensations can also occur in diesters. This reaction, known as the Dieckmann cyclization, works best for 1,6diesters and 1,7diesters due to angle strain considerations in the final cyclic betaketo ester product. Symmetric diesters form only one product,

When using kernel level threads, a thread context switch within the same address space is equivalent or close to: a).-a function call b).-a system call c)-a process context switch The i-node free list for a file system can usually be found in: a).-The i-node free list b).-The superblock c).-The boot block d).-The metadata block If you are

Turnish group of companies is an upcoming business that specialises in Big data and Data mining. They are in a process of setting up their IT systems, and they have consulted you for advice on the operating system they should use. They are stuck between Windows and Linux OS. As a computer expert: a) Which OS will you advise them to use and why? b)