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Q:

Which layer ensures the trustworthly transmission of data across a physical link and is primarily concerned with physical addressing, line discipline, network topology, error notification, ordered delivery of frames, and flow control?

Answer

PDUs at the data link layer are called frames and provide physical addressing, plus other options to place packets on the network medium.

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Subject: CCNA

Q:

Which layer is used for reliable communication between end nodes over the network and provides mechanisms for establishing , maintaining , and terminating virtual circuits; transport - fault detection and recovery; and controlling the flow of information?

Answer

The Transport layer uses virtual circuits to create a reliable connection between two hosts.

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Subject: CCNA

Q:

If a switch has three computers connected to it, with no VLANs present, how many broadcast and collision domains is the switch creating?

A) Three broadcast and one collision B) Three broadcast and three collision
C) one broadcast and three collision D) One broadcast and one collision
 
Answer & Explanation Answer: C) one broadcast and three collision

Explanation:

If a switch has three computersconnected to it, with no VLANs present , one broadcast and three collision domains are created.

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Filed Under: CCNA

Q:

A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

A) Send a different source port number B) Restart the virtual circuit
C) Decrease the sequence number D) Decrease the window size
 
Answer & Explanation Answer: D) Decrease the window size

Explanation:

A receiving host can control the transmitter by using flow control ( TCP uses windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does  not overflow its buffers.

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Filed Under: CCNA

Q:

Which of the following devices do not operate at all levels of the OSI model?

A) Network management stations (NMSs) B) Routers
C) Web and application servers D) Network hosts
 
Answer & Explanation Answer: B) Routers

Explanation:

Routersoperate no higher than layer 3 of the OSI model.

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Filed Under: CCNA

Q:

Acknowledgments, sequencing , and flow control are characteristics  of which OSI layer?

A) Layer 2 B) Layer 3
C) Layer 4 D) Lawer 7
 
Answer & Explanation Answer: C) Layer 4

Explanation:

A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the transport layer.

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Filed Under: CCNA

Q:

Organizational Systems

What are Project-based and Non project-based organizations?

Answer



      • Project-based Organizations are those whose operations consist primarily of projects.

      • Non Project-based organizations often may lack management systems designed to support project needs efficiently and effectively.



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Subject: PMP Certification

Q:

Important objective of biotechnology in agriculture section is _________

A) % produce best resistant varieties of plant B) % increase the nitrogen content
C) % decrease the seed number D) % increase the plant weight
 
Answer & Explanation Answer: A) % produce best resistant varieties of plant

Explanation:
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Filed Under: Biology