CS610 Midterm 2010 Solved Paper -Computer Network Fall 2010 Paper 01, Dec 2010

Question No: 1 ( M - 1 )

In broadcast topology there are two categories____.

►    SATELLITE\RADIO

►    RING TOPOLOGY

►    Both a & b

►    None of the above

Question No: 2 ( M - 1 )

The term ……..refers to the general concept of a small block of data

►    Packet

►     Frame

►    Data

►    None of the given

Question No: 3 ( M - 1 )

 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

Question No: 4 ( M - 1 ) 

►    CRC can detect more errors than a simple checksum……

►    True

►    False

Question No: 5 ( M - 1 )

The Ethernet standard specifies that frames are sent using the --------Manchestor

Question No: 6 ( M - 1 ) 

Most LANs that employ ring topology use an access mechanism known as-------

►    CSMA/CD

►    CSMA/CA

►    TOKEN PASSING

►    None of the given

Question No: 7 ( M - 1 )

An ------------method, the network hardware designers specify how type information is included in the frame and the value use to identify various frame types.

►    Explicit frame type

►    Ideal frame type

►    Implicit frame type

►    None of the given

Question No: 8 ( M - 1 ) 

IEEE LLC/SNAP header is --------, which is used to specify the type of data.

►    8 octets

►    8 bytes      

►    8 bits  

►    None of the given    

Question No: 9 ( M - 1 )

Formally named __________ informally known as the thick wire Ethernet or Thick net.

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

Question No: 10 ( M - 1 )t

Most NICs contain _______________ circuitry that allows the NIC to operate independent of the CPU.

Question No: 11 ( M - 1 )

A bridges function in the _________ layers(s).

►    Physical(MAC) 

►    Data Link

►    Network      

►    Physical (MAC) and Datalink

Question No: 12 ( M - 1 ) t

A Bridge forwards or filters a frame by comparing the information in its address table to the frame’s__________

►    Layer 2 source address

►    Source node’s physical address

►    Layer 2 destination address

►    Layer 3 destination address

Question No: 13 ( M - 1 )

The next hop to which a packet is sent depends only on

►    Packet’s destination

►    Packet’s original source

►    Path the packet has taken

►    Non of the given       

Question No: 14 ( M - 1 ) 

__________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
► Variable Bit Rate (VBR) service
► Available Bit Rate (ABR) service
► None of the given
Question No: 15 ( M - 1 ) 

ATM assigns each VC a _____________ identifier that is divided two parts to produce a hierarchy.

►    21-bit      

►    22-bit      

►    23-bit

►    24 bit

Question No: 16 ( M - 1 ) 

ATM was designed for ________ and use a_________

Question No: 17 ( M - 1 )

The product of delay and throughput measures the _____ of data that can be present on the network.

► Area
► Volume
► Length
► None of the given

Question No: 18 ( M - 1 )

A typical port on an ATM switch operates at __________ or higher.

       ► OC-2 speed (155Mbps) 

       ► OC-3 speed (100Mbps)

       ► OC-3 speed (155Mbps)

       ► OC-3 speed (155Gbps)

Question No: 19 ( M - 1 )

A-     interface ---- provides mechanism that automatically assigns a physical address to a station when the station first boots.

Question No: 20 ( M - 1 )

Ntworks.

►    2

►    3

►    4

►    1

21.What is the difference between the physical and logical topologies?(2)

Static routing:

Static routing is not really a routing protocol. Static routing is simply the process of manually entering routes into a device's routing table via a configuration file that is loaded when the routingdevice starts up

Dynamic Routing :

Dynamic routing protocols are supported by software applications running on the routing device (the router) which dynamically learn network destinations and how to get to them and also advertise those destinations to other routers. This advertisement function allows all the routers to learn about all the destination networks that exist and how to those networks. It is more rebust.

Static routing allows routing tables in specific routers to be set up in a static manner so network routes for packets are set. If a router on the route goes down the destination may become unreachable. Dynamic routing allows routing tables in routers to change as the possible routes change.

22. Define static and dynamic routing.(2)

23. What is meant by Bridges STARTUP and STEADY State?(3)

24. How can Switched Virtual Network be established?(3)

25. What is the concept of packet switches?(5)

Packet-switches describes the type of network in which relatively small units of data calledpackets are routed through a network based on the destination address contained within each packet. Breaking communication down into packets allows the same data path to be shared among many users in the network. One common class of contemporary packet switches are thebridge and network hub, which interconnect multiple network segments at the data link layer. Another is the router, a device which operates at the internetwork layer, and connects dissimilar kinds of networks, such as serial lines and local area networks.

26. Write a note on Weight Graph.(5)

The concept of a weighted graph is extremely useful. The weights can be thought of, for example, as the cost of sending a message down a particular arc. (Not necessarily a monetary cost but some combination of time and distance for example). Weighted graphs can be used to formulate the shortest path problem for routing packets.