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NEW QUESTION # 134
What term describes the geographic area within which two or more BSSs on the same channel can hear each other's transmissions and must therefore share airtime?
Answer: D
Explanation:
A co-channel contention domain refers to the collection of all BSSs and stations operating on the same channel that are within range of one another and must therefore share the same airtime through the CSMA/CA contention process. As more APs and clients are added to the same co- channel contention domain, available airtime per device decreases, which is why careful channel planning and AP density design are important in minimizing unnecessary overlap between same- channel cells.
NEW QUESTION # 135
Which spread spectrum technology, used by the original 802.11 and 802.11b amendments, divides data across a wide frequency band using a chipping code to provide resistance to narrowband interference?
Answer: C
Explanation:
Direct Sequence Spread Spectrum (DSSS) is a spread spectrum technology used by the original
802.11 amendment and by 802.11b. DSSS spreads the data signal across a wider frequency band than would otherwise be necessary by combining the data with a redundant bit pattern called a chipping code. This spreading technique provides resistance to narrowband interference, since the loss of a few bits due to interference can be recovered through the redundancy provided by the chip sequence, at the cost of consuming more bandwidth than the original data would require.
NEW QUESTION # 136
Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?
Answer: C
Explanation:
The HT (802.11n) physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS. ERP stands for Extended Rate PHY, which is an extension of the original DSSS (Direct Sequence Spread Spectrum) PHY that supports data rates up to 54 Mbps in the 2.4 GHz band. HR/DSSS stands for High Rate/Direct Sequence Spread Spectrum, which is another extension of DSSS that supports data rates up to 11 Mbps in the 2.4 GHz band. HT stands for High Throughput, which is a new PHY that supports data rates up to 600 Mbps in both the 2.4 GHz and 5 GHz bands. HT uses OFDM (Orthogonal Frequency Division Multiplexing) as its modulation scheme, but it also supports legacy DSSS and ERP devices by using a dual preamble and header structure that allows backward compatibility.
NEW QUESTION # 137
Which mechanism, defined as part of 802.11h, allows an AP to detect and avoid interference with radar systems by dynamically changing channels?
Answer: B
Explanation:
Dynamic Frequency Selection (DFS) is a mechanism required on certain 5 GHz channels that were originally allocated to radar systems, such as weather and military radar. DFS-capable APs continuously monitor the channel for radar signatures. If radar is detected, the AP must vacate the channel and select a different one to avoid interfering with the radar system. DFS, along with Transmit Power Control (TPC), was introduced through the 802.11h amendment to allow 802.11 devices to coexist with radar systems in the 5 GHz band.
NEW QUESTION # 138
What is appended to the end of each 802.11 data frame after the payload?
Answer: D
Explanation:
The FCS (Frame Check Sequence) is appended to the end of each 802.11 data frame after the payload. The FCS is a 4-byte field that contains a CRC-32 (Cyclic Redundancy Check) value that is calculated based on the contents of the MAC header and the payload of the frame. The FCS is used by the receiver to verify the integrity of the frame and to detect any errors or corruption that may have occurred during transmission. If the FCS does not match with the expected value, the frame is discarded by the receiver. References: , Chapter 4, page 139; , Section 4.2
NEW QUESTION # 139
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