Friday, February 10, 2012

NETWORKING chapter 3

SG Network Topologies and Technologies
Chapter 3

TRUE/FALSE

     1.   A network’s physical topology refers to the arrangement of the cabling and how the devices connect to each other.

     2.   The physical bus topology is no longer used because it required extra cable to connect all the computers and required a central device.

     3.   A point-to-point topology is typically used for WAN connections.

     4.   A network’s logical topology often depends on the central device’s electronics.

     5.   A collision can occur on a switch only if the switch is operating in full-duplex mode.

MULTIPLE CHOICE

     1.   In a physical bus topology, both ends of the medium must be terminated in order to prevent what?

a.
signal propagation
b.
signal bounce
c.
signal degradation
d.
collision


     2.   Which of the following is NOT an advantage of a physical star?

a.
easier network upgrades
b.
centralized monitoring and management of traffic
c.
use of faster technologies
d.
provides redundancy and fault tolerance


     3.   Which of the following is the physical topology that is daisy-chained like a bus and in which the cabling is brought around from the last device to the first device?

a.
physical bus
b.
physical star
c.
physical ring
d.
point-to-point


     4.   What is the main advantage of a point-to-point topology?

a.
data travels on a dedicated link
b.
provides redundancy and fault tolerance
c.
relatively inexpensive
d.
a reliable and fast backbone


     5.   What type of logical topology is at work when using an Ethernet hub?

a.
logical bus
b.
logical ring
c.
switched topology
d.
hierarchical topology


     6.   What type of logical topology does a Wireless LAN use?

a.
logical bus
b.
logical star
c.
switched topology
d.
hierarchical topology


     7.   In a token ring network, what is the central device called?

a.
multiport Ethernet switch
b.
multiservice switch
c.
multisession drive
d.
multistation access unit


     8.   What is the most common topology and technology combination in use today?

a.
logical bus / Ethernet
b.
logical bus / wireless LAN
c.
logical ring / token ring
d.
switched / Ethernet


     9.   Which of the following is NOT a characteristic of Unshielded Twisted Pair cabling?

a.
contains four pairs of copper wire
b.
susceptible to electrical interference
c.
operates in half-duplex only
d.
comes in numbered categories


   10.   What is the Ethernet frame type that is used by TCP/IP?

a.
Ethernet 802.3
b.
Ethernet 802.2
c.
Ethernet II
d.
Ethernet SNAP


   11.   What does the frame trailer consist of in an Ethernet frame?

a.
source MAC address
b.
destination MAC address
c.
frame payload
d.
cyclic redundancy check


   12.   What is the media access method used by Ethernet?

a.
CSMA/CD
b.
CSMA/CARP
c.
CSMA/CA
d.
CDMA


   13.   What is the best way to eliminate the possibility of collisions in a network?

a.
Only use switches.
b.
Use higher speed hubs.
c.
Use NICs that operate in full-duplex mode.
d.
Both a and c


   14.   When discussing Ethernet standards, what does the XBaseY terminology refer to?

a.
the length or type of cabling, the transmission speed, and the type of transmissions
b.
the transmission speed, the type of transmissions, and the length or type of cabling
c.
the transmission speed, the length or type of cabling, and the type of transmissions
d.
the length or type of cabling, the type of transmissions, and the transmission speed


   15.   When using UTP cabling, what is the maximum cable length that can be used from the NIC to a hub or switch?
a.
1 meters
b.
10 meters
c.
100 meters
d.
1000 meters


   16.   What is the IEEE standard governing wireless networking?

a.
802.3
b.
802.5
c.
802.3ab
d.
802.11


   17.   When a wireless computer uses a peer-to-peer connection to directly connect to another wireless computer, it is operating in what mode?

a.
infrastructure
b.
ad hoc
c.
hot spot
d.
Wi-Fi


   18.   In wireless networks, what type of media access control is used?

a.
CSMA/CD
b.
CSMA/CARP
c.
CSMA/CA
d.
CDMA


   19.   What is the main disadvantage of cable modem networking?

a.
The modems have to modulate and demodulate the signals.
b.
It is only capable of speeds up to 60MBps and usually only delivers 10MBps.
c.
It uses an asymmetrical communication scheme.
d.
It uses a bus topology.


   20.   Which of the following is NOT a component of an Ethernet frame header?

a.
6-byte destination MAC address field
b.
6-byte source MAC address field
c.
2-byte type field
d.
4-byte frame check sequence


COMPLETION

     1.   The way that data travels in a network is referred to as the network’s ____________ topology.

     2.   In a large network, in which several switches need to be connected together, usually one device is placed at the center, forming a(n) ____________ star.

     3.   The most popular LAN technology used today is ____________.

     4.   When a wireless computer connects with an AP before it connects with other devices, it is operating in ____________ mode.

     5.   A ___________ topology is fully redundant and is the most expensive to implement.

MATCHING

Match each item with a statement below:
a.
logical topology
f.
CSMA/CA
b.
physical topology
g.
CSMA/CD
c.
mesh topology
h.
media access control
d.
point-to-point topology
i.
broadband
e.
collision
j.
baseband


     1.   sends a digital signal using the entire bandwidth

     2.   how the cables connect one device to another

     3.   can occur when two devices on the same medium transmit simultaneously

     4.   connects every device to every other device

     5.   how the data travels from one device to another

     6.   uses an analog signal to send multiple signals simultaneously

     7.   access method used by Wi-Fi

     8.   direct connection between two devices

     9.   devices on the network must listen first before they can transmit

   10.   rules governing how media is transmitted and received

SHORT ANSWER

     1.   What is the difference between a network’s physical topology and its logical topology?

     2.   In a physical bus topology, why do the ends of the cable have to be terminated?

     3.   What are the advantages and disadvantages of a physical star topology?

     4.   Describe the structure of an Ethernet frame.

     5.   What is CSMA/CD and how does it work?

     6.   What is the difference between operating in half-duplex mode or full-duplex mode and why does it eliminate collisions?

     7.   What are the four wireless standards, and how are they different?

     8.   What media access method does Wi-Fi use, and how is it different from Ethernet’s?

     9.   What type of topology, both physical and logical, is implemented in a token ring network, and how does it work?

   10.   What are the four primary physical topologies?  Briefly describe each one.

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