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NEW QUESTION: 1
Of the following, which multiple access method for computer networks does 802.11 Wireless Local Area Network use?
A. 802.11 Doesn't support multiple access methods
B. CSMA/CD
C. CSMA/CA
D. 802.11 RTS/CTS Exchange
Answer: C
Explanation:
Back in the time when network hubs were commonly used in networks all sent packets were received by all stations but only the intended destination MAC address was supposed to listen. (Sniffers respond to all destination MAC addresses and can save those packets for examination.) Hub did not provide for any security or privacy.
Hub networks turned out not to be scalable because of the high amount of frame collisions on the network as the number of nodes and the amount of traffic would increase. Collisions are where two stations speak on the wire at the same time and both frames being sent are damaged and must be re-transmitted.
Wireless networks are like hub networks because all stations "see" all traffic sent on the wire. This situation is mitigated by the CSMA/CA access method. With CSMA/CA the node wishing to send listens to the network to see if anybody is transmitting and if they are they will wait. Otherwise they send their traffic.
CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is a protocol for carrier transmission in 802.11 networks. Unlike CSMA/CD (Carrier Sense Multiple Access/Collision Detect) which deals with transmissions after a collision has occurred, CSMA/CA acts to prevent collisions before they happen.
In CSMA/CA, as soon as a node receives a packet that is to be sent, it checks to be sure the channel is clear (no other node is transmitting at the time). If the channel is clear, then the packet is sent. If the channel is not clear, the node waits for a randomly chosen period of time, and then checks again to see if the channel is clear. This period of time is called the backoff factor, and is counted down by a backoff counter. If the channel is clear when the backoff counter reaches zero, the node transmits the packet. If the channel is not clear when the backoff counter reaches zero, the backoff factor is set again, and the process is repeated.
The following answers are incorrect: CSMA/CD: CSMA/CD doesn't support wireless networks well due to the problem of latency and "hidden nodes" are not visible to other nodes but are visible to the AP - Access Point. This means that Collision Detection won't work because control frames won't be received. This is used only on wired networks.
Carrier Sense Multiple Access/Collision Detect (CSMA/CD) is the protocol for carrier transmission access in Ethernet networks. On Ethernet, any device can try to send a frame at any time. Each device senses whether the line is idle and therefore available to be used. If it is, the device begins to transmit its first frame. If another device has tried to send at the same time, a collision is said to occur and the frames are discarded. Each device then waits a random amount of time and retries until successful in getting its transmission sent. CSMA/CD is specified in the IEEE 802.3 standard.
802.11 Doesn't support multiple access methods: This isn't correct. 802.11 wireless supports multiple access to the wireless medium using CSMA/CA.
802.11 RTS/CTS Exchange: This isn't an access control method, rather they're supplemental packets to CSMA/CA where nodes request to send (RTS) clear to send (CTS) Packets exchanged by nodes to enhance signaling.
The following reference(s) were/was used to create this question:
CEH - Certified Ethical Hacker: Sybex, Kimberly Graves - Wiley Publishing, INC 2010
NEW QUESTION: 2
Your network contains an Active Directory domain named contoso.com. The domain contains a domain controller named Server1 that runs Windows Server 2012 R2.
On Server1, you create a work folder named Work1.
A user named User1 connects to Work1 from a computer named Computer1.
You need to identify the last time the documents in Work1 were synchronized successfully from Computer1.
What should you do?
A. From Server Manager, review the properties of Computer1.
B. From Windows PowerShell, run the Get-SyncUserSettingscmdlet.
C. From Server Manager, review the properties of User1.
D. From Windows PowerShell, run the Get-SyncSharecmdlet.
Answer: C
NEW QUESTION: 3
DRAG DROP
You are a systems administrator for a small company.
You deploy five Windows 10 Enterprise computers.
You need to create a system image backup for each computer and save the image to a network share.
How should you construct the PowerShell command? To answer, drag the appropriate command component to the correct target. Each command component may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
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