Guide to Networking Essentials - Ch. 3

Physical bus topology

. . . is defined as a continuous length of cable connecting one computer to another in daisy-chain fashion

linear and ring

A daisy-chained network can take two basic forms:

T

A logical bus can be implemented as a physical star or a physical bus. (T/F)

T

A logical bus is used with hub-based Ethernet and Wi-Fi networks. (T/F)

physical ring or a physical star

A logical ring can be implemented as a . . .

T

A network technology defines the structure of frames and how a network interface access a medium to send frames. (T/F)

T

A star takes more cable than e.g. a bus, but the benefit is that if a cable fails, only one node will be brought down. (T/F)

T

A star topology, along with the extended star, is the most common for implementing LANs. (T/F)

Wireless Bridge

A type of wireless repeater that connects different 802.11 standards.

Much faster technologies than a bus; Centralized monitoring and management of network traffic are possible; Easier network upgrades

Advantages: Physical Star Topology

bus, star, ring, and point-to-point

All network designs today are based on these basic physical topologies . . .

omnidirectional or unidirectional

Antennas are usually categorized by their radiation pattern:

T

As long as cabling and NICs support it, a star network can be easily updated by replacing the central device. (T/F)

CSMA/CA

Carrier Sense Multiple Access/Collision Avoidance

CSMA/CD

Carrier Sense Multiple Access/Collision Detection

absorption, refraction, diffraction, reflection, and scattering

Common types of Wi-Fi interference are . . .

Point-to-Multipoint Topology (PMP) topology

Consists of multiple devices connecting to a single device in order to communicate

100 Mbps

FDDI ran over fiber-optic cabling at . . .

11

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

T

Hubs and switches can include software that collects statistics about network traffic patterns and detect errors. (T/F)

signal propagation

In a Physical Bus Topology signals travel across the medium and from device to device is called . . .

Physical Bus Topology

In this topology, all the nodes are connected through a single cable known as 'Backbone'.

omnidirectional antenna

Issues and receives wireless signals with equal strength and clarity in all directions.

Token ring or FDDI networks

Logical ring is most commonly seen in . . .

802.11b, 802.11g, 802.11a, 802.11n, and 802.11ac.

Most common Wi-Fi standards are . . .

T

Point-to-point topologies are used primarily in WANs and with wireless bridges. (T/F)

4 Mbps and 16 Mbps and ran over twisted-pair cabling

Token ring operated at speeds of . . .

Physical Star Topology

Uses a central device (hub or switch) to connect computers

F

Weakness of Physical bus topology - break in the bus does not brings down the entire network. (T/F)

T

Weakness of Physical bus topology - ends of the bus must be terminated. (T/F)

F

Weakness of Physical bus topology - or removing a machine does not bring down the entire network temporarily. (T/F)

T

Weakness of Physical bus topology - the maximum total length of cabling is 185 meters. (T/F)

T

Weakness of Physical bus topology - there's a limit of 30 computers per cable segment (T/F)

T

When the number of workstations you need exceed the number of ports on a central device you simply add another central device. (T/F)

802.3bz

Which Ethernet standard can deliver up to 5 Gbps of bandwidth over Cat 5e and Cat 6 cabling?

802.11ac

Which Wi-Fi standard uses beamforming to allow an AP to send data to multiple devices simultaneously?

d. CSMA/CA - carrier sense multiple access/collision avoidance

Which access method does wifi use? a. CSMA/CD b. Token bus c. Demand priority d. CSMA/CA - carrier sense multiple access/collision avoidance

b) CSMA/CD

Which access method uses a "listen before sending" strategy? a) token passing; b) CSMA/CD; c) token bus; d) polling

a) break up a network into functional groups; c) work with IP addresses; e) allow computers on different networks to communicate

Which of the following are true about routers? (Choose all that apply.) a) break up a network into functional groups b) make larger broadcast domains c) work with IP addresses d) forward broadcasts out all connected ports e) allow computers on different networks to communicate

Logical Bus Topology

Which of the following best describes a typical wireless LAN? a) Logical ring topology; b) Logical switching topology; c) Logical bus topology; d) Logical star topology

b) Logical bus

Which of the following describes a hub-based Ethernet network? a) Physical bus; b) Logical bus; c) Physical switching; d) Logical star

Physical Topology

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

b) Creates dynamic connections; d) Uses a physical star topology

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

a) Consists of Four Wires; c) Has a distance limitation of 100 meters; d) Susceptible to electrical interference

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

a) Often used as backbone cabling; d) uses two strands of fiber

Which of the following is a feature of 100BaseFX (choose all that apply)? a) Often used as backbone cabling b) best when only short cable runs are needed c) fastest of the ethernet standards d) uses two strands of fiber

b) FCS; c) Destination MAC address; d) data

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

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

Which of the following is an advantage of a star topology? a) Allows faster technologies than a bus does; b) Required less cabling than a bus; c) Centralized monitoring of network traffic; d) No single point of failure

a) scalable; b) best effort delivery system

Which of the following is considered a property of ethernet? a) scalable; b) best effort delivery system; c) guaranteed delivery system; d) obsolete technology

b) collision domain

Which of the following is defined by the extent to which signals in an ethernet bus topology network are propagated? a) physical domain; b) collision domain; c) broadcast domain; d) logical domain

b) uses a central device; d) most like a logical bus and physical star

Which of the following is true about infrastructure mode in wireless networks? a) best used for temp networks b) uses a central device c) resembles a physical bus and logical ring d) most like a logical bus and physical star

d) operates only in full duplex mode

Which of the following is true of IEE 802.3an? a) requires two airs of wires b) uses cat 5 or higher cabling c) currently best for desktop computers d) operates only in full duplex mode

A destination address of 12 hexadecimal Fs is a broadcast

Which of the following is true of a MAC address?

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

Which of the following is true of a MAC address? a) All binary 1s in the source address indicate a broadcast frame. b) It's sometimes called a logical address. c) A destination address of 12 hexadecimal Fs is a broadcast. d) It's composed of 12 bits.

b) collision detection is turned off; c) its possible only with switches

Which of the following is true of full duplex ethernet (choose all that apply)? a) stations can transmit and receive but not at the same time; b) collision detection is turned off; c) its possible only with switches; d) allows a physical bus to operate much faster

Wireless bridge

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

Physical Bus Topology

Which topology is famouly used for the local area network (LAN)?

PMP

Which topology is likely to be deployed in a WAN where there's a central office and three branch offices, and you want all traffic from the branch offices to go through the central office network?

Physical bus

Which topology most likely uses coaxial cabling?

Scattered

Which type of Wi-Fi signal interference is most likely to be caused by leaves on trees?

a) 802.11ac

Which wi-fi standard can provide the highest bandwidth? a) 802.11ac b) 802.11b c) 802.11n d) 802.11g

Wi-Fi

Wireless technology based on Ethernet, but uses the CSMA/CA media access method.

Unidirectional

You're configuring a WLAN in a long narrow ballroom. The only place you can put the AP is at the far end of the room. Which type of antenna should you use?

network topology

describes how a network is physically laid out and how signals travel from one device to another; categorized into physical and logical topologies

Topology

describes the lay of the land

terminator

is an electrical component called a resistor that absorbs the signal instead of allowing it to bounce back up the wire

Signal bounce

is the term used when electricity bounces off the end of a cable and back in the other direction

unidirectional antenna

signals are focused in a a single direction, which make them ideal for placement at one end of a long narrow spaces or to cover distances between buildings.

T

weakness of Physical bus topology - technologies using this topology are limited to 10 Mbps half-duplex communication since they use coaxial cabling. (T/F)

T

Several point-to-point connections can create a mesh topology for the purpose of redundancy. (T/F)

10BaseT, 100BaseT and 1000BaseT

Subcategories of IEEE 802.3 are . . .

T

The Ethernet uses the CSMA/CD access method, which is turned off when a full-duplex connection is established. (T/F)

T

The antenna on a Wi-Fi device is both the transmitter and receiver. (T/F)

physical topology

The arrangement of cabling and how cables connect one device to another in a network is considered the network's . . .

Bus, ring and switched

The main logical topologies are . . .

Ethernet

The most common network technology for LANs . . .

Logical topology

The path data travels between computers on a network is considered the network's