CS610 Computer Network Paper May 2010

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MIDTERM EXAMINATION
Spring 2010
CS610- Computer Network
Ref No: 1143600
Time: 60 min
Marks: 40

Question No: 1 ( Marks: 1 ) - Please choose one
In Point-to-Point topology there are two topologies.

► Star and Tree
► Tree and Ring
► Star and Ring
► Star and Tree
► None of the given



Question No: 2 ( Marks: 1 ) - Please choose one
------ Program sends a message to a remote computer and reports whether the computer responds.

► Ping
► Ping
► Traceroute
► ICMP
► Non of the given



Question No: 3 ( Marks: 1 ) - Please choose one
------ has no way to determine the cause of the problem.


► ICMP
► ICMP
► Non of the given
► Ping
► Trace route



Question No: 4 ( Marks: 1 ) - Please choose one
The term----- ------- refers to the general concept of a small block of data

► Packet
► Packet
► Frame
► Data
► None of the given



Question No: 5 ( Marks: 1 ) - Please choose one
---------- scheme, which is designed to help detect transmissions errors, send one extra bit of information with each character

► Parity
► Parity
► Checksums
► CRC
► None of given



Question No: 6 ( Marks: 1 ) - Please choose one
Local Talk is a LAN technology that employs -------------


► Bus topology
► Bus topology
► Ring topology
► None of the given
► Star topology



Question No: 7 ( Marks: 1 ) - Please choose one
Most LANs that employ ring topology use an access mechanism known as-------


► TOKEN PASSING
► CSMA/CD
► CSMA/CA
► TOKEN PASSING
► None of the given



Question No: 8 ( Marks: 1 ) - Please choose one
Ethernet uses a ------ bit static addressing scheme in which each device is assigned a unique address by the manufacturer.


► 64
► 64
► 48
► 32
► 8



Question No: 9 ( Marks: 1 ) - Please choose one
Formally named __________ informally known as the thick wire Ethernet or Thick net.

► 10 Base T
► 10 Base 2
► 10 Base 5
► 10 Base T
► None of the given




Question No: 10 ( Marks: 1 ) - Please choose one
Formally named __________ informally known as the twisted pair Ethernet or TP Ethernet.

► 10 Base 2
► 10 Base 2
► 10 Base 5
► 10 Base T
► None of the given



Question No: 11 ( Marks: 1 ) - Please choose one
The maximum size of an Ethernet segment is___________

► 500 meters
► 250 meters
► 500 meters
► 700 meters
► None of the given


Question No: 12 ( Marks: 1 ) - Please choose one
A Bridge can ________


► Do all the above
► Filter a frame
► Forward a frame
► Extend a LAN
► Do all the above



Question No: 13 ( Marks: 1 ) - Please choose one
_______ computes shortest paths in a graph by using weights on edges as a measure of distance.

► Dijksta’s algorithm
► Greedy algorithm
► Distance vector algorithm
► Dijksta’s algorithm
► Non of the given



Question No: 14 ( Marks: 1 ) - Please choose one
__________is used for compressed audio and video where the data rate depends on the level of compression that can be achieved.

► Constant Bit Rate (CBR) service
► Constant Bit Rate (CBR) service
► Variable Bit Rate (VBR) service
► Available Bit Rate (ABR) service
► None of the given




Question No: 15 ( Marks: 1 ) - Please choose one
Basic LAN technologies such as Ethernet, Token Ring, and FDDI use a _____.


► Connection-oriented service paradigm
► Connectionless service paradigm
► Connection-oriented service paradigm
► Both Connectionless and Connection-oriented service paradigm
► None of the given



Question No: 16 ( Marks: 1 ) - Please choose one
The product of delay and throughput measures the _____ of data that can be present on the network.


► None of the given
► Area
► Volume
► Length
► None of the given




Question No: 17 ( Marks: 1 ) - Please choose one
A network with throughput T and delay D has a total of ________ bit in transit at any time.


► T x D
► T / D
► T x D
► T + D
► None of the given




Question No: 18 ( Marks: 1 ) - Please choose one
One repeater _______, two repeaters ________ the maximum cable length limitation.

► doubles, triple
► doubles, triple
► square roots, cude roots
► and, triple
► doubles, cancel



Question No: 19 ( Marks: 1 ) - Please choose one
A network uses a ------ if all computers attach to a central point


► Star Topology
► Star Topology
► Ring Topology
► Bus Topology
► None of the given



Question No: 20 ( Marks: 1 ) - Please choose one
Computers attached to an ethernet use ------ in which a computer waits for the ether to be idle before transmitting a frame.


► TOKEN PASSING
► CSMA/CD
► CSMA/CA
► TOKEN PASSING
► None of the given



Question No: 21 ( Marks: 2 )
What is the difference between LAN and WAN?

Local area network (LAN)
LAN is small in size covers the area within a room, building or cities.
Wide area network (WAN)
WAN is large in size and covers the area cities, countries and continents.

Question No: 22 ( Marks: 2 )
Define the term Jitter.

The term Jitter is used for variance in transmission delays. Jitter is significance for voice, video and data. Jitter can occur when a packet is delayed because the network is busy.

Question No: 23 ( Marks: 3 )
GIve a comparision of wiring Schemes.
Thick Ethernet wiring scheme.
This uses thick coax cable. AUI cable or transceiver or drop cable connects from NIC to transceiver. AUI cable carries digital signal from NIC to transceiver. The transceiver generates analog signal on coax cable. The wires in AUI carry digital signals power and other control signals. Thick Ethernet also requires terminators to avoid signal reflectance.

Thin Ethernet wiring scheme.
Thin Ethernet uses thin coax cable that is cheaper and easier to install than thick Ethernet coax. In thin ethernet wiring scheme transceiver electronics are built into NIC and NIC connect directly to network medium. Coax cable use connector on NIC. Coax runs directly to back of each connected computer by T-connector. The T-connector directly attaches to NIC.

Question No: 24 ( Marks: 3 )
How can Switched Virtual Network be established?

Most networks offer dynamic connections that last for a relatively short time. ATM can dynamically establish a switched virtual circuit SVC that allows it as long as necessary and then terminate it. The computer sends a connection request to the switch to which it is attached. Software in the switch finds a path to the destination and sends with the connection request. Each pair of switches in the path communicates to choose a VPI/VCI for their tables. Once the connection is established by the destination than a message is given back to the originating computer to indicate the SVC is ready.


Question No: 25 ( Marks: 5 )
Describe permanent virtual circuits (PVC).

ATM can provide the virtual circuits that look like traditional leased digital circuits. The permanent virtual circuits PVC works as long as the customer pays the periodic fee for its use. The forwarding table enter configured the terms used by Telco Provisioning requires two steps.
To determine a complete path.