NWC203 7

In IEEE 802.11 MAC for wireless LANs, which of following inter-frame space (IFS) is used to transmit high-priority frames such as ACKs?

• A, SIFS

• B, DIFS

• C, None of the above

• D, PIFS

Which of following statements identifies the similarity between HDLC (data link control) and Ethernet (medium access control)

• A, All of the above

• B, Both contain framing information that delineates the beginning and end of each frame

• C, Both implement error control and flow control functions to provide reliable transmission

• D, Both provide connection-oriented packet transfer services to the network layer

Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?

• A, ALOHA

• B, CDMA

• C, CSMA/CD

• D, CSMA/CA

Which of the following are management services offered by the MAC sublayer in wireless LAN

• A, Network management

• B, Storage management

• C, Roaming within ESS

• D, Power management

In CSMA/CA, An amount of time divided into slots called

• A, Contention window

• B, Contention procedure

• C, Contention energy

• D, Contention signals

In medium access control sublayer, medium usage is mediated by the access control during contention period

• A, True

• B, False

In Carrier Sense Multiple Access/Collision Detection (CSMA/CD), to continue transmission process we use a

• A, Signal

• B, Station

• C, Access point

• D, Loop

Which layer LAN bridges work on?

• A. Transport layer

• B. Network layer

• C. Medium access control

• D. None of above

One can use repeaters, bridges and routers to interconnect two LANs. Which of the following approaches will make local traffic stay in its own LAN?

Two answer

• A. repeaters

• B. routers

• C. bridges

• D. All of the above

Of the following network layer functions, which one is optional?

• A. Routing

• B. Forwarding

• C. Congestion control

• D. None of the above