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Wednesday, December 17, 2014

Computer Networking Interview Q & A 17 Dec. 2014

Define the terms Unicasting, Multicasting and Broadcasting?
If the message is sent from a source to a single destination node, it is called Unicasting.
If the message is sent to some subset of other nodes, it is called
Multicasting.
If the message is sent to all the m nodes in the network it is called
Broadcasting.
What is Multiplexing?
Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
List the layers of OSI
a. Physical Layer b. Data Link Layer c. Network Layer
d. Transport Layer e. Session Layer
f. Presentation Layer g. Application Layer
Which layers are network support layers?
a. Physical Layer
b. Data link Layer and c. Network Layers
Which layers are user support layers?
a. Session Layer
b. Presentation Layer and
c. Application Layer
Which layer links the network support layers and user support layers?
The Transport layer links the network support layers and user support layers.
What are the concerns of the Physical Layer?
Physical layer coordinates the functions required to transmit a bit stream over a physical medium.
a. Physical characteristics of interfaces and media 
b. Representation of bits
c. Data rate
d. Synchronization of bits e. Line configuration
f. Physical topology
g. Transmission mode
What are the responsibilities of Data Link Layer?
The Data Link Layer transforms the physical layer, a raw transmission
facility, to a reliable link and is responsible for node-node delivery
a. Framing
b. Physical Addressing 
c. Flow Control
d. Error Control
e. Access Control
What are the responsibilities of Network Layer?
The Network Layer is responsible for the source-to-destination delivery of packet possibly across multiple networks (links).
a. Logical Addressin
b. Routing
What are the responsibilities of Transport Layer?
The Transport Layer is responsible for source-to-destination delivery of the entire message.
 a. Service-point Addressing
 b. Segmentation and reassembly
 c. Connection Control
 d. Flow Control e. Error Control
What are the responsibilities of Session Layer?
The Session layer is the network dialog Controller. It establishes, maintains and synchronizes the interaction between the communicating systems.
a. Dialog control
b. Synchronization
What are the responsibilities of Presentation Layer?
The Presentation layer is concerned with the syntax and semantics of the information exchanged between two systems.
a. Translation 
b. Encryption
c. Compression
What are the responsibilities of Application Layer?
The Application Layer enables the user, whether human or software, to access the network. It provides user interfaces and support for services such as e-mail, shared database management and other types of distributed information services.
a. Network virtual Terminal
b. File transfer, access and Management (FTAM)
c. Mail services
d. Directory Services
What are the two classes of hardware building blocks?
 Nodes and Links.
What are the different link types used to build a computer network?
a. Cables
b. Leased Lines

c. Last-Mile Link
d. Wireless Links

Wednesday, December 10, 2014

IT & desktop support interview questions and answers


A customer complains that his computer is working slowly. What things should you check?     
Check the following:  
- Is start-up time longer than usual?
- Is it slower with one particular application or slower overall? 
- Are there any viruses, malware or spyware? 
- Available Hard Disk space.

What is your troubleshooting process?
The basic troubleshooting process is:   
- Identify the problem.
- Consider likely causes.
- Test theories to localize the cause.    
- Formulate and implement a plan to solve the problem.
- Verify that the problem is solved 

- Record your findings, what action you took and the outcome.

What is your least favorite aspect of desktop support?
This is designed to see how well you will fit with the present team. A good answer would be along the lines of being unable to solve a problem due to factors outside you control, like hardware failure for instance.

Describe a situation where you have had to deal with a difficult person and how you handled it? Do you think you should have done anything differently? 
This question is best answered by reference to a successful outcome to a difficult situation that you have encountered. In general terms, you could say that you understand the frustration of end users and that good communication often goes a long way to resolving issues.

Would you describe yourself as a problem solver? If so, why? Can you give any example
You should obviously give a positive answer. You should give examples that show that you can think critically and highlight your skills.

Saturday, December 6, 2014

IT & Desktop support interview questions and answers

What is the purpose of Device Drivers?
Device Drivers are the software required to run hardware components.

What is one of the latest Computer Processors (CPU)? 
The Intel Pentium Quad Core Intel I3, I5 and I7 processors.

What does USB stand for?   
Universal Serial Bus – the current version is 2.0. It allows the
connection of peripherals without the need to shut down the computer.

Which desktop operating systems are you familiar with? 
You will need to have familiarized yourself with the system used by the organization you are hoping to join. Focus your answer on those systems, but also mention other systems with which you have experience.

What are the disadvantages of using imaging software? 
   
This question is designed to test your familiarity with imaging software. Describe image testing and the attributes of particular software to show your familiarity with imaging.

Define Hard-Disk Partitions?

Hard disk partitions divide the hard disk drive into smaller segments to enable
better space management. Each partition on the disk can then be considered as a separate disk allowing different file systems to be used on each. 

What are some of the Ports available in a computer?  
Common ports are: PS/2 ports, for keyboard and mouse. USBports. Sound ports.LAN or Ethernet ports. VGA ports.

What does DHCP stand for and what is its purpose? 

Dynamic Host Configuration Protocol – it assigns dynamic IP addresses to network devices allowing them to have a different IP address each time they are
connected to the network.

What does DNS stand for and what is it used for? 
    
Domain Name Service (or System or Server) – it translates domain names into IPaddresses.

List five Microsoft Office applications.

MS Word, MS Excel, MS PowerPoint, MS Outlook and MS Access

What are some versions of Windows XP?
XP Professional, XP Home, Media Centre, Tablet PC and Mobile

What components are needed to set up a Basic Home Network?
Router/Hub, LAN cards and LAN cables.

What is the purpose of BOOT.INI?

Boot.ini is used to decide which operating system options are displayed during the start-up process.

What is the difference between RAM and ROM?
RAM stands for Random Access Memory. It is used for the temporary storage of data that is being worked on. ROM is Read-Only Memory and is used for permanent storage of data that should never be changed, like BIOS for example.

If the audio for your computer is not working, what would you check?

Check the following: Speaker volume, cable connections, power to the speakers and device drivers.

What are the lights on a Modem/LAN Card and what do they indicate?  

The lights are:
- Power light – indicates if the power is on.
- Link light – indicates if the modem is receiving broadband or Internet signals from the ISP.
- Data light – indicates if the Internet is working.
- Connectivity light – indicates if the modem is connected to a computer.  
 
Identify a few Firewalls.    
There are two basic types of firewall – network layer, which make decisions based on source and destination addresses, and application layer, which are hosts run on proxy servers and allow no direct traffic between networks. Zone Alarm etc. Firewalls.
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