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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 RTS/CTS Exchange
B. 802.11 Doesn't support multiple access methods
C. CSMA/CD
D. CSMA/CA
Answer: D
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.
8 02.11 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

A. Option D
B. Option C
C. Option B
D. Option A
Answer: D

NEW QUESTION: 3
You need to create a table to serve as a data source for an SSRS report You estimate that this SSRS re potentially returning over 50,000 rows of data.
Which type of table should you use?
A. a TempDB table
B. an InMemory table
C. an inherited table
D. a regular table
Answer: C

NEW QUESTION: 4
The advantages of searching online valuation information include all of the following EXCEPT:
A. Faster and more efficient information retrieval than is usually possible in printed sources
B. To get maximum benefit from industry and economic research
C. The ability to combine different facets of a subject in a single search statement
D. The ease of searching several databases in sequence to produce a comprehensive survey of the available literature
Answer: B