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CompTIA A+ 2009 - Network Connectivity
From Skillport
114
Computer Networking
Professional
10/04/2011

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Cards

Term
In a LAN, all devices are attached to a common _______ ______.
Definition
transmission system
Term
A LAN can use (4) these as a connection media:
Definition
• fiber-optic
• coaxial
• twisted-pair cabling
• wireless technology, as connection media.
Term
LAN is a ____-____ network, with connections that run at 10, 100, or 1000 Mbps.
Definition
high-speed
Term
What are the two categories of connectivity technology?
Definition
Wired
Wireless
Term
Use a physical transmission medium to connect systems together to form a network
Definition
Wired technologies
Term
Don't use a physical medium to connect systems together to form a network.
Wireless technologies
Definition
wireless
Term
What is the medium of Wireless technologies?
Definition
The transmission medium is typically radio-frequency based or light based.
Term
Technologies that use wires to physically interconnect networks include (5)
Definition
• dial-up networking
• broadband cable
• broadband Digital Subscriber Line or DSL
• Integrated Services Digital Network or ISDN, and
• Ethernet
Term
_____-___ ______ enables a computer or any other network device to connect to a LAN or the Internet via telephone lines.
Definition
Dial-up networking
Term
Why is dial-up no longer used?
Definition
poor connectivity speeds and reliability issues
Term
Standard Dial-up Speed
Definition
56 Kbps
Term
What modem speeds are typically achieved?
Definition
modem speeds of 33.6 Kbps or lower are often achieved.
Term
How can dial-up speeds be increased?
Definition
International standards such as V.90 and V.92, enable data to be compressed before transmission, thus increasing the transfer speeds to 56 Kbps.
Term
(T/F)
The data transfer rates of dial-up networking are much lower than the rates offered by broadband technologies.
Definition
True
Term
_______ uses digital signals to transfer data.
Definition
Broadband
Term
(T/F)
Most broadband systems remain connected to the Internet – at all times.
Definition
True
Term
The kinds of broadband services available are (2):
Definition
Cable
DSL
Term
Speed of broadband cable
Definition
500Kbps or more, typically between 1 – 2 Mbps
Term
Cable technology is based on bandwidth shared with other cable subscribers, making _____ _____ dependent on the number of subscribers on the network.
Definition
data rates
Term
(T/F)
A cable signal is always available so you don't need to connect to the ISP every time you want to access the Internet.
Definition
True
Term
DSL
Definition
Digital Subscriber Line
Term
Uses a modem and an Ethernet card to connect to the Internet.
Definition
DSL
Term
Speed of DSL
Definition
transfers data using a digital signal and offers speeds of 1.5 Mbps and higher.
Term
(T/F)
Like cable, DSL is a shared service.
Definition
False
Unlike cable, DSL isn't a shared service connection. However, DSL can generally only transmit data over short initial distances from the central office or telephone exchange.
Term
How close do you have to live near an exchange to use a DSL?
Definition
You typically have to live within 4 kilometers of the exchange to use DSL.
Term
The two types of DSL technology are:
Definition
ADSL
SDSL
Term
data download speeds being far greater than data upload speeds
Definition
ADSL
Term
ADSL
Definition
Asymmetric DSL
Term
(T/F)
ADSL is intended for large businesses who download more information than they send.
Definition
False
ADSL is intended for home users and small businesses who download more information than they send.
Term
ADSL Receiving data rates
Definition
typically 1 Mbps and upwards
Term
ADSL sending rates
Definition
sending data rates are typically 256 Kbps and upwards
Term
(T/F)
Sending rates are always lower with ADSL.
Definition
True
Term
SDSL
Definition
symmetric DSL
Term
equal rates for sending and receiving data
Definition
SDSL
Term
(T/F)
SDSL is inexpensive for small-sized businesses.
Definition
False
SDSL can be fairly expensive and is intended for small-sized and medium-sized businesses requiring equal speeds for sending and receiving data.
Term
SDSL data rates
Definition
up to 3 Mbps.
Term
Older standard used to send encoded voice, data, and video over regular telephone copper wires.
Definition
ISDN
Term
(T/F)
An ISDN connection requires an adapter or an ISDN router.
Definition
True
Term
(T/F)
A basic rate ISDN channel is 56 Kbps, and channels can be aggregated up to 1 Mbps.
Definition
False
A basic rate ISDN channel is 64 Kbps, and channels can be aggregated up to 2 Mbps.
Term
(T/F)
ISDN supports medium-speed or high-speed transmission rates.
Definition
True
Term
ISDN uses multiplexing to _____ multiple channels.
Definition
Aggregate
Term
(T/F)
ISDN can simultaneously support between thirty-two and sixty-four 56 Kbps data lines on a single channel.
Definition
False
ISDN can simultaneously support between two and thirty 64 Kbps data lines on a single channel.
Term
Why is broadband more popular than ISDN?
Definition
Broadband has become more popular than ISDN due to higher transfer speeds.
Term
The process of combining multiple information channels over a shared transmission medium.
Definition
Multiplexing
Term
What is the advantage of multiplexing?
Definition
It saves costs and increases capacity.
Term
(T/F)
Broadband satellite connections can sometimes rival the transmission speeds of broadband cable and DSL.
Definition
True
Term
What do you need to connect to the internet via satellite (3)?
Definition
satellite dish antenna
transceiver
satellite ISP
Term
What can degrade a satellite signal?
Definition
Solar interference and unfavorable weather can compromise satellite Internet connectivity. These can degrade the signal or cause the connection to be lost.
Term
Which of these connection types use telephone transmission lines to provide network access?
Options:
1. DSL
2. ISDN
3. Cable
4. Satellite
Definition
Correct answer(s):
1. DSL
2. ISDN
Term
What are the ways that a VoIP subscriber can connect to its service provider?
Definition
VoIP phone
Softphone
ATA
Term
(T/F)
VoIP phones used in conjunction with a service provider let users connect directly to the IP network, using ISDN or Ethernet.
Definition
False
WiFi or Ethernet
Term
What do you need in order to make VoIP calls?
Definition
Router
PC headset with a microphone, or telephone.
Term
_______ is the official IEEE 802.3 standard, standardized by the Institute of Electrical and Electronic Engineers.
Definition
Ethernet
Term
This standard applies to wired LANs, defining the physical and data-link layers, and controlling how data is transmitted.
Definition
Ethernet
Term
Ethernet can be broken down into three main categories:
Definition
• 1000 Mbps or Gigabit Ethernet – a LAN standard for Gigabit data transmission
• 100 Mbps or Fast Ethernet – a LAN standard for 100 Mbps data transmission
• 10 Mbps Ethernet
Term
One variation of 10 Mbps Ethernet is _______
Definition
10BaseT
Term
In 10BaseT notation, the "10" refers to the theoretical ______ ______ _____ rate in megabits per second.
Definition
maximum data transmission
Term
The "Base" is short for_______.
Definition
Baseband
Term
What is meant by baseband?
Definition
This means each data signal has full, unmodulated control of the cable, on a single frequency over twisted pair cable.
Term
10BaseT uses ___ cabling to link workstations and hubs to form a network.
Definition
unshielded twisted-pair, also known as UTP
Term
Maximum bandwidth of UTP
Definition
While it supports a maximum bandwidth of 10 Mbps
Term
What lowers the maximum bandwidth possible for 10BaseT?
Definition
protocol overhead and, in some cases, collisions.
Term
What is the maximum cable length between devices under the 10Base specification?
Definition
allows for a maximum cable length between devices of 100 meters.
Term
10BaseT networks use a _____ _____ with a central hub or switch, connected by either category 3, category 4, or category 5 UTP cabling.
Definition
star topology
Term
To eliminate the need to rewire a network if you upgrade to ______ ______, you should use category 5 cabling when initially wiring a 10BaseT network.
Definition
Fast Ethernet
Term
______ ______ are used to house cable connections running from wall plates, and also provide termination points.
Definition
Patch panels
Term
(T/F)
Ports on the patch panel are linked to the switch with patch cables.
Definition
True
Term
(T/F)
10BaseT is not capable for creating large LANs.
Definition
False
Although better suited to smaller LANs, it's possible to network large numbers of computers using 10BaseT.
Term
How can a large LAN be achieved using 10BaseT?
Definition
This can be achieved by cascading hubs or switches into a tree or cascaded star topology, or by using stackable hubs.
Term
For optimal performance, collision domains supporting no more than ____ nodes are recommended, despite the ____ node capacity.
Definition
300
1024
Term
_______ ______ refers to the quality, accuracy, and consistency of the data.
Definition
Data integrity
Term
derived from the two conductors that are twisted together to cancel out electromagnetic interference in this cable:
Definition
Twisted pair cabling
Term
(T/F)
The outer covering of the cable is referred to as the coat.
Definition
False
jacket
Term
There are two variations of twisted-pair cabling:
Definition
1. Unshielded Twisted Pair, or UTP and
2. Shielded Twisted Pair, or STP
Term
What is the key difference between UTP and STP?
Definition
The key difference between UTP and STP is the extra layer of insulation beneath the jacket, referred to as the shield, characteristic of STP cabling. The shield helps fend off interference from outside devices, better protecting the data traveling through the cable.
Term
For UTP and STP, distances greater than 100 meters are made possible by connecting segments to one another via ______.
Definition
repeaters
Term
What is the function of a repeater?
Definition
A digital signal degrades as it travels, and some repeaters restore and boost the signal before relaying it. This enables the signal to travel further along the cabling.
Term
Made from two layers of insulation and a plastic exterior shield the center.
Definition
Coaxial cable
Term
There are two kinds of coaxial cabling:
Definition
Thinnet
Thicknet
Term
uses RG-58 cable, which is .25 inches thick. It transmits at 10 Mbps and the maximum allowable cable length is 185 meters.
Definition
Thinnet, or Thin Ethernet,
Term
uses RG-8 radio grade and is .50 inches thick. It transmits at 10 Mbps and the maximum allowable cable length is 500 meters.
Definition
Thicknet, or Thick Ethernet,
Term
Thinnet uses ____ connectors, named for it's inventors, to connect to a workstation.
Definition
BNC
Term
Thicknet uses an _____ port to link the cable to the system with a transceiver known as a vampire tap.
Definition
AUI
Term
AUI
Definition
Adapter Unit Interface
Term
A _____ ____ has small 'teeth' that clamp the cable and cut into its core to enable an electrical signal to pass from the system to the main network cable.
Definition
vampire tap
Term
(T/F)
Fiber optic cabling can transmit data across distances of 10 kilometers or more.
Definition
False
2 kilometers or more
Term
(T/F)
The major drawback of fiber optic cabling is the cost involved.
Definition
True
Term
Fiber optic cable comprises an optical, or glass, fiber core, insulated by _____ _____, all enclosed in a jacket.
Definition
glass cladding
Term
It is impossible to corrupt fiber optic signals through electronic interference.
Definition
True
Term
How many channels are supported by one fiber optic cable?
Definition
The cable supports two fiber channels, one for sending and the other for receiving data.
Term
What are the transmission speeds of fiber optic cables?
Definition
Transmission speeds range from 100 Mbps to 10 Gbps.
Term
What are the two applications for fiber optic cabling?
Definition
SMF
MMF
Term
SMF
Definition
Single-mode fiber
Term
Uses one ray of light, or mode, to transmit information over longer distances
Definition
SMF
Term
MMF
Definition
Multimode fiber
Term
Uses multiple modes to transmit information over shorter distances, at the same time.
Definition
MMF
Term
(T/F)
For MMF, each mode runs at an identical reflection angle.
Definition
False
Different reflection angle
Term
What are the connectors used for fiber optic cabling (4)?
Definition
ST
SC
LC
MT-RJ
Term
ST connector
Definition
Straight Tip connector
Term
Spin-off of the BNC connector used with thinnet cables, but applied to optical fiber connections
Definition
ST connector
Term
SC
Definition
Subscriber Connector
Square Connector
Term
A small plastic square, although not as small as LC, for fiber optic connections
Definition
SC
Term
LC
Definition
Fiber Local Connector
Term
resembles the SC, but smaller form factor
Definition
LC
Term
MT-RJ
Definition
Mechanical Transfer-Registered Jack
Term
resembles the RJ-45 connector, however it has a smaller form factor and is used for fiber optic connections
Definition
MT-RJ
Term
Question
Which cable types are limited to transmitting data along distances of less than 200 meters?
Options:
1. STP
2. Thinnet
3. Thicknet
4. Fiber optic
Definition
Correct answer(s):
1. STP
2. Thinnet
Term
Whatever connection type is implemented, clients on a TCP/IP network are usually allocated an IP address ______ via DHCP.
Definition
Automatically
Term
(T/F)
Dynamic IP addresses are usually assigned to desktop clients.
Definition
True
Term
(T/F)
Some servers, such as Active Directory Domain Controllers and ISDN servers must be assigned a static IP address, so that they can be addressed consistently with the same IP.
Definition
False
Active Directory Domain Controllers and DNS servers
Term
Before you can configure the properties within the Network and Sharing Center, _____ prompts you to authorize the action.
Definition
UAC, User Account Control
Term
(T/F)
If you choose to obtain an IP address and DNS server address automatically, then the client is configured for DHCP.
Definition
True
Term
(T/F)
If you choose to create a static IP address, you only need to enter the dotted decimal numerical value of the IP address.
Definition
False
IP address and the subnet mask
Term
What cables are limited to connections of 200m or less?
Definition
STP
Thinnet
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