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Q:

Which layer combines bits into bytes and bytes into frames, uses MAC addressing , and provides error detection?

Answer

The Data Link layer is responsible for the framing of data packets.

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Subject: CCNA

Q:

If a hub has three computers connected to it, how many broadcast and collision domains is the hub 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: D) One broadcast and one collision

Explanation:

If a hub has three computers connected to it, one broadcast and one collision domain is created

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Filed Under: 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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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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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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Q:

Routers operate at layer _____. LAN switches operate at layer ______. Ethernet hubs operate at layer _____. Word processing operates at layer _______.

A) 3, 3, 1, 7 B) 3, 2, 1, none
C) 3, 2, 1, 7 D) 3, 3, 2, none
 
Answer & Explanation Answer: B) 3, 2, 1, none

Explanation:

Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.

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Filed Under: CCNA

Q:

Project Procurement Management - Processes

Describe the Inputs, Tools and Techniques , Outputs included in the Plan Contracting?

Answer

I. Inputs



  • Procurement management plan

  • Contract statement of work

  • Make-or-buy decisions

  • Project management plan


                 - Risk register


                 - Risk related contractual agreements


                 - Resource requirements


                 - Project schedule


                 - Activity cost estimate


                 - Cost baseline


II. Tools and Techniques



  • Standard forms

  • Expert judgment


III. Outputs



  • Procurement documents

  • Evaluation criteria

  • Contract statement of work (updates)

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Subject: PMP Certification