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الاثنين، 6 مايو 2019

Computer Networks Questions & Answers – Packet Switching & Circuit Switching MCQ أسئله شبكات بالأجابات الجزء الخامس عشر


Computer Networks Questions & Answers – Packet Switching & Circuit Switching

 


1. A local telephone network is an example of a _______ network.
a) Packet switched
b) Circuit switched
c) Both Packet switched and Circuit switched
d) Line switched
Answer: b
Explanation: Circuit switching is connection oriented switching technique. Whereas in the case of packet switching, it is connectionless. Circuit switching is implemented in the Physical layer, whereas packet switching is implemented in the Network layer.
2. Most packet switches use this principle ____________
a) Stop and wait
b) Store and forward
c) Both Stop and wait and Store and forward
d) Stop and forward
Answer: b
Explanation: The packet switch will not transmit the first bit to outbound link until it receives the entire packet.
3. If there are N routers from source to destination, a total end to end delay in sending packet P(L-> number of bits in the packet R-> transmission rate)
a) N
b) (N*L)/R
c) (2N*L)/R
d) L/R
Answer: b
Explanation: The equation to find the end to end delay when no. of bits, transmission rate and no. of routers is given by (N*L)/R.
4. What are the Methods to move data through a network of links and switches?
a) Packet switching
b) Circuit switching
c) Line switching
d) Both Packet switching and Circuit switching
Answer: d
Explanation: Packet switching and Circuit switching are two different types of switching methods used to connect the multiple communicating devices with one another.
5. The resources needed for communication between end systems are reserved for the duration of the session between end systems in ________
a) Packet switching
b) Circuit switching
c) Line switching
d) Frequency switching
Answer: b
Explanation: In circuit switching, a physical path between the sender and receiver is established. This path is maintained until the connection is needed.
6. As the resouces are reserved between two communicating end systems in circuit switching, this is achieved ___________
a) authentication
b) guaranteed constant rate
c) reliability
d) store and forward
Answer: b
Explanation: Circuit switching is connection oriented and is always implemented in the physical layer. Once a path is set, all transmission occurs through the same path.
7. In _________ resources are allocated on demand.
a) packet switching
b) circuit switching
c) line switching
d) frequency switching

Answer: a
Explanation: In packet switching, the bits are received in out of order and need to be assembled at the receiver end. Whereas in the case of Circuit switching, all the bits are received in order.


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