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Chapter 6 MC
Chapter 6 MC
This activity contains 10 questions.
In CDMA, let Y
m
be the received value in the mth mini-slot for some slot i. Let c
m
, m=1,...,M, be the sender's M code values. To determine the bit value the sender sent, the receiver
simply declares Y
m
as the sent value.
multiples Y
m
with the sum of the M code values.
multiples each Y
m
with the corresponding c
m
, sums the resulting values and divides by M.
none of the above.
A beacon frame sent by an AP includes:
the AP's MAC address.
both the AP's MAC address and SSID.
the AP's SSID.
none of the above.
The 802.11 protocol does not implement collision detection because
the adapter would still not be able to detect all collisions due to hidden terminals.
collision detection was found to be useless in wired Ethernet.
it is costly to build wireless hardware that detects collisions.
all of the above.
Packets sent by two stations in 802.11 can collide because
the packets are sent to different APs but on the same channel.
at a given time, the random backoff values of the two stations are the same.
the two stations could be hidden from each other.
all of the above.
An 802.11 frame includes:
sequence number field.
an acknowledgement field.
four address fields.
all of the above.
One of the major standards for 3G wireless access is
GPRS.
IS-136.
EDGE.
none of the above.
A desired property of 4G is
maintenance of TCP connections while roaming.
high-speed access.
ubiquitous wireless access.
all of the above.
In the context of indirect routing for mobility management, consider a datagram emitted by the Home agent that is destined to the Mobile node. In this datagram
the destination IP address will be that the Foreign agent.
the source IP address will be that of the mobile node.
the permanent IP address of the Mobile node will be contained in the data field (payload) of the datagram.
all of the above.
The mobile IP standard includes the following pieces:
agent discovery.
registration with the home agent.
indirect routing of datagrams.
all of the above.
In GSM, when system decides to handoff a mobile user, which of the following devices informs the visited MSC that a handoff is to be performed:
the VLR.
the old base station.
the mobile itself.
the new base station.
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