CS610 - Midterm 2008 Solved Paper -Computer Network -
Fall 2008
Marks = M
________ has a jitter zero
None of the given
Virtual Private Network
Isochronous Network
Asynchronous Network
Unlike Frame Relay and ATM, SMDS (Switched multi-megabit Data service) offers_______.
Connectionless service paradigm
Connection oriented service paradigm
Both Connectionless and Connection-oriented service paradigm
None of the given
ATM assigns each VC a _____________ identifier that is divided two parts to produce a hierarchy.
21-bit
22-bit
23-bit
The VC is identified by a 24-bit value formed from the VPI or Virtual Path Indicator (8-
bit),
Most WAN systems include a mechanism that can be used to eliminate the common case of duplication routing is called___________
Hierarchal address
Default route
Shortest path
None of the given
The next hop to which a packet is sent depends only onPacket’s destination
Packet’s original source
Path the packet has taken
Non of the given
An interface for twisted pair Ethernet must have a ____________ connector, and must generate signals according to the_____________ specification.
RJ-45, 10 Base T
RJ-45, 10 Base 5
BNC, 10 Base 2
BNC, 10 Base T
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When an application___________ data, it makes a copy of the data available to all other computers on the network.
Broadcasting
Multicasting
Unicasting
None of the given
When an application broadcasts data, it makes a copy of the data availableto all other computers on the network. Broadcast has many uses. For example, suppose a computer needs to find one of the printers on the network
A ____________ provide a mechanism that a customer can use to set a physical address.
Static addressing scheme
Configurable addressing scheme
Dynamic addressing scheme
None of the given
One of the advantages of a configurable addressing scheme becomes apparent when network interface hardware fails and must be replaced: unlike hardware that uses a static assignment, a configurable interface can be replaced
FDDI can transmits data at a rate of ___________________100 million bits per second
100 million bits per second
100 million bits per second
None of the given
FDDI: Fiber distributed data interconnect (FDDI) is another ring technology. Its most
important features are:
It uses fiber optics between stations and transmits data at 100Mbps.
It uses pair of fibers to form two concentric rings.
Computers attached to an ether use ------ in which a computer waits for the ether to be idle before transmitting a frame.
CSMA/CD
CSMA/CA
TOKEN PASSING
None of the given
________________ has advantages arisen from the size and ease of computation.
CRC
Parity
Checksums
None of given
The chief advantages arise from the size and ease of computation. Most networks that employ a checksum technique use a 76-bit or J2-bit checksum, and compute a single checksum for an entire packet.
The term ___________ is used to denote the definition of a packet used with a specific type of network.
Packet
Frame
Data
None of the given
To help distinguish between the general idea of packet transmission and the specific definition of packets for a given hardware technology, we use the term frame to denote the definition of a packet used with a specific type of network
______________ has no way to determine the cause of the problem.
Ping
Trace route
ICMP
Non of the given
Ping has no way to determine the cause of the problem. Another reason why ping may fail to generate a response is less subtle: some companies configure their site to reject ping packets.
_____________ Program sends a message to a remote computer and reports whether the computer responds.
Ping
Trace route
ICMP
Non of the given
In ____________, network occupies the smaller area like a room a floor or a building.
LAN
WAN
MAN
None of the given
Question No: 16 ( M - 1 ) http://vuzs.net
No error detection scheme is perfect because transmission errors can affect the additional information as well as the data.
Question No: 17 ( M - 2 ) Format is not clear even I try to do with cntl+A and then change format with 12/Times new roman or ariel. But fail
Question No: 18 ( M - 2 )
Question No: 19 ( M - 3 )
Question No: 20 ( M - 5 )
Which type of information is obtained from network sniffer and in which mode Network sniffer operates?
Solution:
A network analyzer also called network monitor or a network sniffer is used to examine the performance of or debug a network. It can report statistics such as capacity utilization, distribution of frame size, collision rate or token circulation time
Most installations still use DIX Ethernet encoding in which there is no LLC/SNAP header in the frame. A network analyzer can tell from the values in the type field (small values are lengths, which mean an LLC/SNAP header is located in the first octets of the data area; large values are types, which mean no LLC/SNAP header is included).
The operation of network analyzer is a computer with a network interface that receives all frames, which is called promiscuous mode. So many desktop computers have interface that can be configured for promiscuous mode. When combined with software computer can examine any frame on LAN. In this way the communication across LAN is guaranteed to be private. Computer receives and displays frames on the LAN.
Network analyzer can be configured to filter and process frames. It can count frames of specific type of size. It displays only frames from or to specific computers.
Question No: 21 ( M - 10 )
Thick Ethernet, Thin Ethernet and Twisted pair Ethernet.
Solution:-
Thick Ethernet:
Thick Ethernet, officially known as 10 Base-5, is the oldest form of Ethernet.
One form of cabling supported by Ethernet is low-loss 50 Ohm coaxial cable as shown in the figure below. This type of cable is 0.5" diameter (usually supplied with a yellow outer PVC coating) and rather inflexible. It has become known in the communications industry as "Thick Ethernet". The official name for this cable is 10 Baseband5 (10B5), indicating that it is specified for baseband communications at 10 Mbps over distances up to 500m.
Thin Ethernet:
Thin Ethernet, officially called 10 Base-2, is a less expensive version of 10 Base-5 (Thick Ethernet) technologies. It uses a lighter and thinner coaxial cable and dispenses with the external transceivers used with 10 Base-5.
10 Base-2 uses an RG-58A/U coaxial cable and is wired in a bus topology. Each device on the network is connected to the bus through a BNC "T" adapter, and each end of the bus must have a 50 Ohm terminator attached. Each node on the bus must be a minimum of 0.5 meters (1.5 feet) apart, and the overall length of the bus must be less than 185 meters (606 feet).
Twisted Pair Ethernet:
Twisted Pair Ethernet (10baseT), sometime also called "UTP" from "Unshielded Twisted Pair", is based on using a cable similar to phone-wiring. The cable is connected via RJ-45 connectors to the network card installed in the PC.
