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51.
_____________________is immune to electromagnetic or radio-frequency interference.
- A.Twisted-pair cabling
- B.CSMA/CD
- C.Broadband coaxial cabling
- D.Fiber-optic cabling
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Companies that want to ensure the safety and integrity of their data should use fiberoptic cable because it cannot be affected by electromagnetic or radio-frequency interference. Even though some copper cables have shielding, they are not immune to EMI or RFI. This eliminates twisted-pair and coaxial. CSMA/CD is an access method, not a cable type. |
52.
Which IEEE 802 standard defines a bus topology using coaxial baseband cable and is able
to transmit at 10Mbps?
- A.802.1
- B.802.2
- C.802.3
- D.802.5
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The IEEE 802.3 standard originally specified the use of a bus topology with coaxial baseband cable and can transmit data up to 10Mbps. |
53.
Which OSI layer signals “all clear” by making sure the data segments are error free?
- A.Application layer
- B.Session layer
- C.Transport layer
- D.Network layer
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| It is the responsibility of the Transport layer to signal an “all clear” by making sure the data segments are error free. It also controls the data flow and troubleshoots any problems with transmitting or receiving data frames. |
54.
___________________ is the type of media access method used by NICs that listen to or sense
the cable to check for traffic and send only when they hear that no one else is transmitting.
- A.Token passing
- B.CSMA/CD
- C.CSMA/CA
- D.Demand priority
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Carrier Sense Multiple Access with Collision Detection (CSMA/CD) specifies that the NIC pause before transmitting a packet to ensure that the line is not being used. If no activity is detected, then it transmits the packet. If activity is detected, it waits until it is clear. In the case of two NICs transmitting at the same time (a collision), both NICs pause to detect and then retransmit the data. |
55.
What model is used to provide a common way to describe network protocols?
- A.OSI
- B.ISO
- C.IEEE
- D.CSMA/CD
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The Open Systems Interconnection (OSI) model is used to describe how network protocols should function. The OSI model was designed by the International Organization for Standardization (ISO). |
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