Networking Chapter 3

what is the most common topology and technology combination in use today?

switched / Ethernet

Network _________ is the method a network interface uses to access the medium and send data frames and the structure of these frames

technology

________ is the arrangement of network cabling between devices?

physical topology

What are two advantages of a star topology?

-Allows faster technologies than a bus does -Centralized monitoring of network traffic

What are 2 characteristics of unshielded twisted-pair cabling?

-Has a distance limitation of 100 meters -Susceptible to electrical interference

What are 3 characteristics of a logical ring topology?

-It's used by FDDI -Some technologies use a token -One technology uses a MAU

What are 2 features of 802.11n?

-Offers speeds up to 600 Mbps -Operates at the 2.4 GHz and the 5.0 GHz frequencies

What are some characteristics of a logical ring topology?

-One technology uses a MAU-It is used by FDDI-Some technologies use a token

What are 2 properties of Ethernet?

-Scalable -Best effort delievery system

Which of the following is a field of the most common Ethernet frame type?

1.FCS2.Destination MAC Address3.Data

How many channels may be used in North America by Wi-Fi networks operating at the 2.4 GHz frequency range?

11

802.11a operates at __Ghz

54

802.11g can transmit at _____ Mbps.

54

How many links would you need in a full mesh configuration if you had 4 nodes?

6

Which of the following is true of a MAC address?

A destination address of 12 hexadecimal Fs is a broadcast

What is 2 advantages of a start topology

Allows faster technologies than a bus does Centralized monitoring of network traffic

What is the media access method used by Ethernet?

CSMA/CD

What is the name of the media access method used by Ethernet?

CSMA/CD

Which access method uses a "listen before sending" strategy?

CSMA/CD

The physical star topology uses a _____ to interconnect computers in a LAN.

Central device

What is the name of the most widely used physical topology in networks today?

Extended Star

an ethernet frame is composed of two parts: the header and data portion... True or false?

False

CSMA/CD is the media access method used by Ethernet (802.3) and Wi-Fi (802.11) networks.

False - CSMA/CD is only used in half-duplex mode(802.3z, an, ae - are full-duplex only) Wi-Fi uses CSMA/CA

An Ethernet frame is composed of two parts: the header and data portion.

False - a frame header, data (frame payload), frame trailer

What are 2 facts about full-duplex Ethernet?

It's possible only with switches Collision detection is turned off

Which best describes a typical wireless LAN

Logical bus topology

What are some characteristics of fiber-optic cabling?

Lower bandwidth capability, Used in large internetworks to connect switches and routers, Can be used in electrically noisy environments, Carries data over longer distances than UTP does

Which of the following is not a component of an Ethernet frame? -Type -None -Destination MAC address -Source MAC address -FCS

None

Which of the following is true of IEEE 802.3an?

Operates only in full-duplex mode

Which media access method is used by FDDI?

Token passing

A network's logical topology often depends on the central device's electronics... True or false?

True

which technology is likely to be implemented as a point-to-point physical topology?

Wireless Bridge

When a Wi-FI signal passes through a solid object, it is said to attenuate(weaken). This type of signal interference is classifies as ___.

absorption

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

ad hoc

what is the wireless device used to link buildings without cable?

bridge

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.

extended

A network's logical topology takes into account the way that the computers are cabled together and whether they have a central connecting device or not... true or false

false

A switch can operate in full-duplex mode, sending and receiving data at the same time, which may result in collisions... true or false

false

The arrangement of cabling and how the cables connect one device to another in a network is considered the network's logical topology, ad the path data travels between computers on a network is considered the network's physical topology... true or false

false

the four most common physical topologies are bus, star, ring, and mesh

false

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

infrastructure

What type of logical topology does a Wireless LAN use?

logical bus

A physical star topology has a single point of failure that may cause the entire network to go down.. true or false

true

When using UTP cabling, what is the maximum cable length that can be used from the NIC to a hub or switch?• 100 meters• 10 meters• 1000 meters• 10 feet• 100 feet

• 100 meters

Which of the following is true about the token ring technology? (Choose all that apply.)• It uses a physical ring topology.• Less expensive than CSMA/CD networks.• All computers have equal access to the media.• It uses RTS/CTS signaling before transmission can occur.• Only the computer with the token can transmit data.

• All computers have equal access to the media.• Only the computer with the token can transmit data.

Which of the following is a characteristic of a switched logical topology? (Choose all that apply.)• It is the most secure logical topology• Creates dynamic connections• Uses a physical star topology• Sometimes called a shared-media topology• Uses a physical bus topology

• Creates dynamic connections• Uses a physical star topology

Which of the following is NOT an advantage of a physical star?• Centralized monitoring and management of traffic• Use of faster technologies• Easier network upgrades• None of these choices• Provides redundancy and fault tolerance

• Provides redundancy and fault tolerance

Which of the following is true about infrastructure mode in wireless networks? (Choose all that apply.)• Uses a central device• Resembles a physical bus and logical ring• Most like a logical bus and physical star• Less secure than ad hoc mode• Best used for temporary networks

• Uses a central device• Most like a logical bus and physical star(logical bus because all nodes hear all nodes in most cases)All other points describe ad hoc mode

What is the main advantage of a point-to-point topology?• all information is encrypted• a reliable and fast backbone• relatively inexpensive• provides redundancy and fault tolerance• data travels on a dedicated link

• data travels on a dedicated link