Understanding LAN Hardware and Campus Design Factors
LAN Hardware
Repeaters– Repeaters are the basic unit in networks that connect separate segments. Repeaters take incoming frames, regenerate the preamble, amplify the signals, and send the frame out all other interfaces. Repeaters operate at the physical layer of the OSI model.
Hubs– hubs were introduced to concentrate thinnet and 10BASE-T networks in the wiring closet. Traditional hubs operate on the physical layer of the OSI model and perform the same functions as basic repeaters. The difference
Read MoreCisco Networking Questions and Answers
What are the three true statements about the default of a new switch? (Choose two.)
- All switch ports are assigned to VLAN1.
- All interfaces are set to automatic.
- The flash directory contains the IOS image.
See illustration. The priorities for port spanning-tree are listed beneath each interface. The network administrator enters the command spanning-tree vlan 1 root primary in S4. What are the three port correct results? (Choose two.)
- S1 Gi0 / 1 becomes a root port.
- S4 Gi0 / 1 becomes a root port.
- S2 Gi0
Essential Linux Commands and Functions
Basic Linux commands
| Command | Description | |
|---|---|---|
ls | Lists all files and directories in the present working directory | |
ls -R | Lists files in sub-directories as well | |
ls -a | Lists hidden files as well | |
ls -al | Lists files and directories with detailed information like permissions, size, owner, etc. | |
cd or cd ~ | Navigate to the HOME directory | |
cd .. | Move one level up | |
cd | To change to a particular directory | |
cd / | Move to the root directory | |
cat > filename | Creates a new file | |
cat filename | Displays the file content | |
cat file1 file2 > file3 | Joins |
Scanf belogs to which header file
#include<stdio.H>
int main()
{
/* my 1st program in C */
printf(“Hello, World! \n”);
return0;
}
Let us take a look at the various parts of the above program −
The 1st line of the program #include <stdio.H> is a preprocessor command, which tells a C compiler to include stdio.H file before going to actual compilation.
The next line int main() is the main function where the program execution begins.
The next line /*…*/ will be ignored by the compiler & it has been put to add additional
Computer Hardware and Mobile Devices Glossary
microATX (MATX)
A smaller version of the ATX form factor. MicroATX addresses some new technologies that were developed after the original introduction of ATX.
serial ATA (SATA)
An ATAPI interface standard for hard drives, optical drives, and other drives that uses a narrower and more reliable cable than the 80-conductor cable and is easier to configure than PATA systems. Also see parallel ATA.
Laptop
A portable computer that is designed for travel and mobility. Laptops use the same technology as desktop
Read MoreUnderstanding Algorithm Analysis and Design
What does it mean when one says that an algorithm is O(n2)?
By definition, the O() notation allows us to describe an upper bound on the growth of whatever it is that we wish to estimate. So, O(n2) would mean that whatever it is that we are estimating does not grow any faster than quadratic as the independent variable n grows. Now, since algorithm analysis has come to mean estimating the resource requirement of an algorithm, and time complexity is of primary importance, to say that an algorithm is
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