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WorksheetsNWC 121-140
Total questions: 20
Worksheet time: 11mins
Which of following statements identifies the similarity between HDLC (data link control) and Ethernet (medium access control)
All of the above
Both contain framing information that delineates the beginning and end of each frame
Both implement error control and flow control functions to provide reliable transmission
Both provide connection-oriented packet transfer services to the network layer
B
Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?
ALOHA
CDMA
CSMA/CD
CSMA/CA
Which of the following are management services offered by the MAC sublayer in wireless LAN
Network management
Storage management
Roaming within ESS
Power management
In CSMA/CA, An amount of time divided into slots called
Contention window
Contention procedure
Contention energy
Contention signals
In medium access control sublayer, medium usage is mediated by the access control during contention period
t
f
In Carrier Sense Multiple Access/Collision Detection (CSMA/CD), to continue transmission process we use a
Signal
Station
Access point
Loop
Which layer LAN bridges work on?
Transport layer
Network layer
Medium access control
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?
repeaters
routers
bridges
All of the above
Of the following network layer functions, which one is optional?
Routing
Forwarding
Congestion control
None of the above
Of the following, which is a basic function of transparent bridge?
All of the above
Learns where stations are attached to the LAN
Prevents loops in the topology
Forwards frames from one LAN to another
It is possible for a network layer to provide a choice of services to the user of the network. Which of following the IP network layer offers
All of the above
connection-oriented transfer of packets with delay guarantee
Best-effort connectionless service
connection-oriented reliable stream service
The network layer is considered the most complex layer because of the following reasons
Requires coordinated actions of multiple, geographically distributed network elements
Responsible for displaying received information to users
Challenges such as addressing and routing
User scalability
An end-to-end function is best implemented at a lower level than at a higher level
t
f
Which of the following is an essential network function
Forwarding
Routing
Priority and scheduling
All of the above
In network layer, which of the following statement is true for packet networks
Individual packet streams are highly bursty
User demand can undergo dramatic change
Internet structure is highly decentralized
All of the above
The main purpose of access multiplexer is to combine the typically bursty traffic flows from the individual computers into aggregate flows
t
f
Which of the following functions can a home router perform?
Private IP addresses in home by network address translation
All of the above
Local area network access using WiFi
Single global IP address using DHCP
Consider a three hop network from the source to the destination. Let m be the packet transmission time at each hop. Let n be the propagation delay at each hop. Assume there is no queuing delay and processing time at each hop. Based on store-and-forward, what is the total time for the packet to be transmitted to the destination?
m + n
3m + n
3m + 3n
None of the above
Consider a three hop network from the source to the destination. Let m be the message transmission time at each hop. Let n be the propagation delay of each hop. Assume there is no queueing delay and processing time at each hop. Based on store-and-forward, what is the total time for three packets to be transmitted to the destination by packet pipelining?
3m + 3n
5m + 3n
9m + 9n
None of the above
One can use repeaters, bridges and routers to interconnect two LANs. Which of the following approaches will make local traffic appear in both LANs?
Repeater
Routers
Bridges
All of the above
