Network simple homework

QUESTION 1

1._____________ is a collection of computers that are associated so that they can directly send frames to each other on wireless networks.

A.

Infrastructure network

B.

Ad hoc network

C.

Peer to peer network

D.

Distributed network

QUESTION 2

1.802.11 tries to avoid collisions with channel sensing before sending and exponential backoff after collisions. What protocols are used for 802.11?

A.

CSMA/CD

B.

CSMA/CA

C.

TDMA

D.

OFDM

QUESTION 3

1.To reduce ambiguities about which station is sending, 802.11 defines channel sensing to consist of both physical sensing and virtual sensing. Physical sensing simply checks the medium to see if there is a valid signal. With virtual sensing, each station keeps a logical record of when the channel is in use by tracking _______________.

A.

Network Allocation Vector

B.

Transmission Opportunity

C.

Medium Access

D.

Virtual Access

QUESTION 4

1.What is the interval between regular data frames in IEEE 802.11 called?

A.

DIFS

B.

SIFS

C.

Inter-Frame

D.

AIFS

QUESTION 5

1.What is NOT a class of the services for 802.16 MAC Sublayer protocols?

A.

Constant bit rate service

B.

Real-time variable bit rate service

C.

Best-effort service

D.

Moduation service

QUESTION 6

1.In response to customer requests for more flexibility, network vendors began working on a way to rewire buildings entirely in software. The resulting concept is called a ____________.

A.

Wireless LAN

B.

Softwaer LAN

C.

Rewire LAN

D.

Virtual LAN

QUESTION 7

1.What is a basic unit of a Bluetooth system?

A.

Scatternet

B.

Master

C.

Piconet

D.

Slave

QUESTION 8

1.

How many active slaves can be handled by a master equiped with Bluetooth?

QUESTION 9

1.

In wireless networks, a collision cannnot be detected. What is used to infer collisions?

QUESTION 10

1.

____________ has two key components: tags and readers. RFID tags are small, inexpensive devices that have a unique 96-bit EPC identifier and a small amount of memory that can be read and written by the RFID reader.

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