Chapter 3

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 _______ Mbps

54

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

6

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

Bridge

What is the media access method used by Ethernet

CSMA/CD

The physical star topology uses a _____________ to interconnect computers in a LAN

Central Device

Which of the following is an advantage of a star topology?

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

T/F 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.

False

T/F CSMA/CD is the media access method used by Ethernet and Wi-Fi

False

T/F The four most common physical topologies are bus, star, ring and mesh

False

What are the components of an Ethernet frame?

Frame check sequence Source MAC address Destination MAC address Type

Which of the following is true 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

Which of the following is true about the token ring technology?

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

Which of the following describes the arrangement of network cabling between devices?

Physical topology

Which of the following is considered a property of Ethernet?

Scalable Best effort delivery system

Which of the following is a characteristic of unshielded twisted pair cabling?

Susceptible to electrical interference Commonly used in physical bus topologies Has distance limitation of 100 meters Is relatively expensive

T/F A network's logical topology often depends on the central device's electronic

True

T/F A physical star topology has a single point of failure that may cause the entire network to go down

True

Which of the following is a characteristic of fiber-optic cabling?

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

Which of the following is true about infrastructure mode in wireless networks?

Uses a central device Most like a logical bus and physical star

Which of the following is a characteristic of a switches logical topology?

Uses a physical star topology Creates dynamic connections

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

Wireless Bridge

Which of the following is an advantage of a star topology?

a. Allows faster technologies than a bus does c. Centralized monitoring of network

Which of the folloeing is a characteristic of fiber-optic cabling? (Choose all that apply)

a. Can be used in electrically noisy environments c. Carries data over longer distances than UTP does

Which of the following is a characteristic of unshielded twisted pair cabling?

a. Consists of four wires c. Has a distance limitation of 100 meters d. Susceptible to electrical interference

Which of the following is the most commonly used Ethernet frame type?

a. Ethernet II

Which of the following is a feature of 100BaseFX? (Choose all that apply)

a. Often used as backbone cabling d. Uses two strands of fiber

Which of the following is considered a property of the Ethernet? (Choose all that apply)

a. Scalable b. Best-effort delivery system

When a WiFi signal passes through a solid object, it is said to attenuate (weaken). This type of signal interference is classified 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

Which of following is true about the token ring topology? (Choose all that apply)

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

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

b. CSMA/CD

Which of the following is true about full-duplex Ethernet? (Choose all that apply)

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

Which of the following is defined by the extent to which signals in an Ethernet bus topology network are propagated?

b. Collision domain

Which of the following is a characteristic of a switched logical topology? (Choose all that apply)

b. Creates dynamic connections d. Uses a physical star topology

Which of the following is a field of the most common Ethernet frame type?(Choose all that apply)

b. FCS c. Destination MAC Address d. Data

Which of the following is an example of a technology using a physical ring topology?

b. FDDI

Which of the following is a characteristic of a logical ring topology? (Choose all that apply)

b. One technology uses an MAU. c. It' s used by FDDI. d. Some technologies use a token.

Which of the following is true about infrastructure mode in wireless networks? (Choose all that apply)

b. Uses a central device d. Most like a logical bus and physical star

How many channels can be used on an 802.11b network in North America?

c. 11

Which Wi-Fi standard can provide the highest bandwidth?

c. 802.11n

Which of the following is true of a MAC address?

c. A destination address of 12 hexadecimal Fs is a broadcast.

Which best describes a typical wireless LAN?

c. Logical bus topology

Which topology most likely uses coaxial cabling?

c. Physical bus

Which of the following describes the arrangement of network cabling between devices?

c. Physical topology

Which media access method does Wi-Fi use?

d. CSMA/CA

Which of the following describes a hub-based Ethernet network?

d. Logical star

Which of the following is true of IEEE 802.3an?

d. Operates only in full-duplex mode

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

d. Wireless bridge

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

data travels on a dedicated link

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

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

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

provides redundancy and fault tolerance

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.

technologies

Which media access method is used by FDDI?

token-passing