1. The sharing of a medium and its link by two or more devices is called _________
a) Fully duplexing
b) Multiplexing
c) Micropleixng
d) Duplexing
Explanation: Multiplexing is a method using which one can send multiples signals through a shared medium at the same time. This helps in using less resources and thus saving the cost of sending messages.
2. Multiplexing is used in _______
a) Packet switching
b) Circuit switching
c) Data switching
d) Packet & Circuit switching
Explanation: Circuit switching is a switching method by which one can obtain a physical path between end points. Circuit switching method is also called a connection oriented network. Two nodes must be physically and logically connected to each other to create a circuit switching network.
3. Which multiplexing technique used to transmit digital signals?
a) FDM
b) TDM
c) WDM
d) FDM & WDM
Explanation: TDM abbreviation for Time Division Multiplexing is a method used for digital signals. Whereas FDM and WDM abbreviation for Frequency Division Multiplexing, and Wavelength Division Multiplexing, are used for analog signals. TDM is used in applications like ISDN (Integrated Services Digital Network) and PSTN (Public Switched Telephone Network).
4. If there are n signal sources of same data rate, then the TDM link has _______ slots.
a) n
b) n/2
c) n*2
d) 2n
Explanation: In TDM, the total unit of time is divided equally among all the signal sources and each and every source has access to the complete channel bandwidth during its allotted time slot. When the time slot of the source is not active, it remains idle and waits for its slot to begin.
5. If link transmits 4000frames per second, and each slot has 8 bits, the transmission rate of circuit this TDM is _________
a) 32kbps
b) 500bps
c) 500kbps
d) 32bps
Explanation: Transmission rate= frame rate * number of bits in a slot.
Given: Frame rate = 4000/sec and number of bits in slot = 8
Thus, Transmission rate = (4000 * 8) bps
= 32000bps
= 32kbps
6. The state when dedicated signals are idle are called __________
a) Death period
b) Poison period
c) Silent period
d) Stop period
Explanation: There are instances when connection between two endpoints has been established, but no communication or transfer of messages occurs. This period of time is called silent period. The silent period ends when either of the two endpoints starts the communication.
7. Multiplexing provides _________
a) Efficiency
b) Privacy
c) Anti jamming
d) Both Efficiency & Privacy
Explanation: Multiplexing helps us to transfer our messages over a shared channel. This brings up the issue of privacy and efficiency. Fortunately, Multiplexing has high efficiency and high privacy when implemented because in the implementation, the transport layer of the OSI network model handles the function of multiplexing through interfaces called ports which provide the required efficiency and privacy.
8. In TDM, the transmission rate of a multiplexed path is always _______ the sum of the transmission rates of the signal sources.
a) Greater than
b) Lesser than
c) Equal to
d) Equal to or greater than
Explanation: In TDM the transmission rate provided by the path that is multiplexed will always be greater than the sum of transmission rates of the single sources. This happens because the transmission rate is provided to each source only for a small period of time.
9. In TDM, slots are further divided into _________
a) Seconds
b) Frames
c) Packets
d) Bits
Explanation: TDM is the abbreviation for Time division multiplexing. It is technique for combining several low rate channels to a single high rate channel. For a certain time slot, the several channels could use the maximum bandwidth. Each channel is inactive for a period of time too. Some other multiplexing techniques are Frequency division multiplexing and Phase division multiplexing.
10. Which of the following delay is faced by the packet in travelling from one end system to another?
a) Propagation delay
b) Queuing delay
c) Transmission delay
d) All of the mentioned
Explanation: When a packet has to travel from one end system to another, it first faces the queuing delay when there are multiple packets which are to be sent, then it faces the transmission delay to convert the packet into bits to be transmitted, and then it faces the propagation delay to propagate the bits through the physical medium.
Why Computer Network ?
What's the Buzz About Multiplexing?
Alright, imagine your computer is a DJ at a mega party, and it wants to play multiple tracks simultaneously. Now, our DJ (aka your computer) needs a way to make sure each track reaches the right speaker (or device). That's where multiplexing steps in – the maestro of data distribution!
Breaking Down Multiplexing in Simple Terms
In computer networks, multiplexing is like a traffic cop directing different data streams onto a shared communication channel. It's the art of merging various signals, so they can groove together without causing a data jam.
Time Division Multiplexing (TDM) – The Time Traveler
Imagine time as a highway, and different data packets have reserved slots. TDM ensures everyone gets their time in the spotlight. It's like a perfectly organized time-traveling parade of information.
Frequency Division Multiplexing (FDM) – The Frequency Maestro
FDM takes a musical approach, assigning unique frequencies to each data stream. It's like giving every instrument its exclusive set of notes, ensuring no harmony clashes.
Wavelength Division Multiplexing (WDM) – The Colorful Communicator
Enter WDM, where data streams are assigned different wavelengths, just like colors in a rainbow. Each wavelength carries its own set of information, creating a vibrant data spectrum.
Why Should You Care?
Multiplexing is the backbone of efficient data transmission. It's the reason you can stream your favorite shows, video call your pals, and scroll through cat memes without a glitch. It's like the unsung hero of your digital adventures!
So, next time you click, swipe, or type, remember the behind-the-scenes magic of multiplexing, turning your bits and bytes into a digital symphony!