Exam 4: IEEE 80211 Physical Layer Standards

DSSS uses a bit pattern called a ____ code.

Because a device must wait to transmit until it receives the last reflected signal, this in effect puts a ceiling limit on the overall speed of the WLAN. What is the current ceiling for WLAN speed?

The amount of time that a transmission occurs on a specific frequency is called the ____________________ time.

The _________________________ Protocol defines a set of specifications for wireless data and voice communications around the home.

Which system is preferred for 802.11b WLANs?

Into which layers are WLAN features isolated by IEEE standards?

When was the concept used by FHSS technology developed?

What is the top layer of the OSI reference model?

How does OFDM avoid problems caused by multipath distortion?

Because wireless technology has advanced at such a rapid pace, the earliest WLANs are now essentially obsolete.

There are two disadvantages to using U-NII. What are they?

What is a disadvantage of narrowband transmissions?

Bluetooth divides the 2.4 GHz frequency into ____ different frequencies spaced 1 GHz apart.

____ is not part of a frame.

The modulation techniques used to encode the 802.11a data vary depending upon the speed. Describe the techniques used to transmit at 24 Mbps.

Users can upgrade from an 802.11b network to a faster 802.11g network simply by replacing the ____________________.

Which layer of the OSI reference model permits the devices on the network to hold ongoing communications across the network?

The ____ coding technique consists of a set of 64 8-bit code words.

According to FCC regulations, all FHSS systems in the 900 MHz band must change frequencies through 50 channels and cannot spend more than ____ on one frequency each 20 seconds.

What are the fields that make up a PLCP frame?