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

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