READ Free Dumps For CISCO- 100-105
| Question ID 14429 | Which of the following are types of flow control? (Choose three.)
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| Option A | buffering
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| Option B | cut-through
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| Option C | windowing
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| Option D | congestion avoidance
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| Option E | load balancing
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| Correct Answer | A,C,D |
Explanation Explanation: During Transfer of data, a high speed computer is generating data traffic a lot faster than the network device can handle in transferring to destination, so single gateway or destination device cannot handle much amount of traffic that is called "Congestion". Buffering The Technie is used to control the data transfer when we have congestion, when a network device receive a data it stores in memory section and then transfer to next destination this process called "Buffering". Windowing Whereas Windowing is used for flow control by the Transport layer. Say the sender device is sending segments and the receiver device can accommodate only a fixed number of segments before it can accept more, the two devices negotiate the window size during the connection setup. This is done so that the sending device doesn't overflow the receiving device's buffer. Also the receiving device can send a single acknowledgement for the segments it has received instead of sending an acknowledgement after every segment received. Also, this window size is dynamic meaning, the devices can negotiate and change the window size in the middle of a session. So if initially the window size is three and the receiving device thinks that it can accept more number of segments in its buffer it can negotiate with the sending device and it increases it to say 5 for example. Windowing is used only by TCP since UDP doesn't use or allow flow control. Reference: http://www.info-it.net/cisco/ccna/exam-tips/flow-control.php
| Question ID 14430 | Which transport layer protocol provides best-effort delivery service with no
acknowledgment receipt required?
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| Option A | HTTP
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| Option B | IP
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| Option C | TCP
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| Option D | Telnet
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| Option E | UDP
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| Correct Answer | E |
Explanation Explanation: UDP provides a connectionless datagram service that offers best-effort delivery, which means that UDP does not guarantee delivery or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services.