What is 1+1= ?
- 1
- 2
- 4
- FISH
Monday, September 30, 2019
Which transmission protocol uses a sequence number?
Which transmission protocol uses a sequence number?
- ICMP
- ARP
- UDP
- TCP
EXPLANATION
The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite. It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, the entire suite is commonly referred to as TCP/IP. TCP provides reliable, ordered, and error-checked delivery of a stream of octets (bytes) between applications running on hosts communicating via an IP network. Major internet applications such as the World Wide Web, email, remote administration, and file transfer rely on TCP. Applications that do not require reliable data stream service may use the User Datagram Protocol (UDP), which provides a connectionless datagram service that emphasizes reduced latency over reliability.
Reliable transmission. TCP uses a sequence number to identify each byte of data.
For machines running Hyper-V, which of the following is the first software to load at boot time?
For machines running Hyper-V, which of the following is the first software to load at boot time?
- The hypervisor
- Windows OS
- Both Windows OS and the hypervisor simultaneously
- Virtual machines and applications
EXPLANATION
A hypervisor or virtual machine monitor (VMM) is computer software, firmware or hardware that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine.
The Live Migration process with Hyper-V refers to which of the following?
The Live Migration process with Hyper-V refers to which of the following?
- Moving VMs from one physical host to another
- Reassigning user rights to different virtual machines
- Moving physical servers to a different part of a data centre
- Upgrading the server OS on a host machine
EXPLANATION
Live migration refers to the process of moving a running virtual machine or application between different physical machines without disconnecting the client or application. Memory, storage, and network connectivity of the virtual machine are transferred from the original guest machine to the destination.Hyper-V live migration is a Microsoft Hyper-V feature that allows administrators to move virtual machines (VMs) between clustered hosts without noticeable service interruption.
Which of the following is an interpreted language?
Which of the following is an interpreted language?
- C#
- Java
- C++
- Python
EXPLANATION
Most programs are written in a high-level language such as C, Perl, or Java. Just as a human language makes it easy for people to communicate with one another, so computer languages simplify the job of telling a computer what to do. However, because a computer only understands numbers, talking to one is like speaking to someone with whom you don't share a language. You need a translator to properly communicate, and that's what interpreters and compilers do.
The difference between an interpreted and a compiled language lies in the result of the process of interpreting or compiling. An interpreter produces a result from a program, while a compiler produces a program written in assembly language. The assembler of architecture then turns the resulting program into binary code. Assembly language varies for each individual computer, depending upon its architecture. Consequently, compiled programs can only run on computers that have the same architecture as the computer on which they were compiled.
A compiled program is not human readable, but instead is in an architecture-specific machine language. Creating a compiled program requires several steps. First, the programmer, using a development tool or even a simple text editor, writes the source code in a chosen computer language. If the program is complex, pieces of it may be spread across several files. The programmer then compiles the program, sorting and linking the modules and translating it all into machine code that the computer understands.
Because different kinds of computers do not speak each others' machine languages, a compiled program will only work on the platform it was designed for. For example, a program written for HP-UX normally will not work on a Mac OS computer or a computer running Solaris. Despite this drawback, compiled programs are faster than those that must be run through an interpreter. Also, it is often possible to recompile the program so that it will run on different platforms. Examples of languages that are normally used to produce compiled programs include C, Fortran, and COBOL.
In an interpreted program, on the other hand, the source code typically is the program. Programs of this type (often known as scripts) require an interpreter, which parses the commands in the program and then executes them. Some interpreters, such as the Unix shells (
sh, csh,
ksh, etc.), read and then immediately execute each
command, while others, such as Perl, analyze the entire script before
sending the corresponding machine language instructions. The advantage
of a script is that it is very portable. Any computer that has the
appropriate interpreter installed may run the program more or less
unchanged. This is a disadvantage as well, because the program will
not run at all if the interpreter is not available. In general,
interpreted programs are slower than compiled programs, but are easier
to debug and revise. Other examples of interpreted languages include
JavaScript and Python.Intermediate to computer-specific compiled programs and interpreted scripts are programs designed for runtime environments. Java and Smalltalk programs are executed in this fashion. Constructing programs for runtime environments is similar to writing traditional compiled programs. The difference is that instead of compiling the source code into a machine language, it is output into byte code for the runtime environment's "virtual machine". This virtual machine intercepts the byte code instructions and translates them into computer-specific commands. The advantage of this approach is that the runtime environment quickly compiles only the needed pieces of the code (some parts of the program may never need to be executed). This is called just-in-time compiling. The major disadvantage with runtime environments is that a program that is not designed well will force the runtime environment to compile almost all of the code up front and then make redundant calls to the interpreter. This makes the program slower to load and run.
