ROC III part 2 BS
Which of the following voltage standing wave ratios (vswr) shown here is best for transferring radio frequency (RF) energy between connections?
1.2:1
The original ethernet operated at which of the following speeds?
10 Mbps
The federal communications commission (FCC) rules regarding power output for frequency hopping spread spectrum (FHSS) state that a maximum output to the intentional radiator (IR) with 5 megahertz (MHz) of carrier frequency bandwidth must be which one of the following
125 milliwatts
The fiber optic links thar usually connect asynchronous transfer mode (ATM) switches operate at which of the following speeds?
155 Mbps
Which is the largest IEEE 802.11 data frame that can traverse a wireless local area network (WLAN) without fragmentation?
2,346 bytes.
Most wireless office local area network (LAN) currently operates in what frequency band?
2.4 GHz
What is the with of direct sequence spread spectrum (DSSS) channel and how far a part are their center frequency spaced?
22 megahertz (MHz) and 5 MHz. (22 and 5)
How many pre-equalizer taps are used in DOCSIS 3.1?
24
Field trials has shown that a docsis 3.1 orthogonal frequency division multiplexing (OFDM) channel is how much more resistant to noise and other impairment than legacy docsis channels?
3 Decibels (3dB)
How many single carrier 256-QAM carriers must be channel bonded to achieve 1000 mbps downstream data rates?
32
Given an access point (AP) with 100 millowatts (mW) of output power connected through a cable with 3 decibels (dB) of loss to the antenna with 10 decibels isotopic (dBi) gain what is the approximate equivalent isotopically radiated power (EIRD) level from the antenna in milliwatts (mW)
500 mW
A transmitter outputs 100 milliwatts (mW). An antenna cable connects the transmitter to an amplifier, and the power into the amplifiers input measures 50 mW. The amplifier increases the signal to the original transmitter power level and sends the signal to the antenna. The antenna receives the signal from the amplifier at 75 mW. And then transmits at 150mw . What is the intentional Radiators (IR) power level in this radio frequency (RF) circuit?
75 mW
Which of the following IEE 802.11 wiresless local area Network WLAND standards specified both spread spectrum RF and infrared IR transmission technologies?
802.11
Which one of the following IEEE wireless standards utilizes the 5 gigahertz GHz frequency band for its signal transmissions?
802.11n remember N
Ethernets carrier sense multiple access with collision detection ( CSMA/CD) method is defined by what institute of electronic engineer ( IEE)?standards?
802.3 remember the 3
What channel bandwidth is the power level out of a single cable modem termination system (CMTS) RF port based upon?
A 6 MHz bandwidth channel.
What does a basic service set (BSS) consist of?
A BSS consists of one access point (AP) and one or more wireless clients.
Which of the following is a characteristic of an asynchronous transfer mode (ATM) cell?
A Cell is always the same size
What power over ethernet (POE) device picks off the direct current (DC) voltage that has been injected into the CAT- 5e cable by the injector and makes it available to the equipment through the regular DC power jack?
A DC picker or tap
In DOCSIS 3.1 Proactive Network Maintenance (PNM), what interacts with other operational support systems (OSS) servers for key information, such as modem locations?
A PNM server.
In DOCSIS 3.1 Proactive Network Maintenance (PNM), what is accessed by a PNM client to display related management information base (MIB) data?
A PNM server.
What device would a wireless local area network (WLAN) administrator install between the access point (AP) or bridge and the network to give indoor local area network (LAN) user as much bandwidth as possible?
A bandwidth control unit (BCU)
When the internal working of a network are unknown to the user it is commonly called
A cloud
Which one of the following statement describes encapsulation?
A computer adding headers to outbound data.
In a building entrance, incoming telephone company cables are generally terminated in which of the following?
A cross connect device
What does the term bit loading describe?
A doscis 3.1 feature in which each orthogonal frequency division multiplexing (OFDM) subcarriers can operate at a different modulation order
What are two denotations where the term channel can apply?
A frequency range and a physical path.
What is the typical coverage pattern of a semi directional antenna?
A hemispherical or cylindrical pattern.
The central point of a start topology is usually
A hub
What is defined in docsis 3.1 that strengthens the security of cable modem authentication and secures software download features?
A new certificate public key infrastructure (PKI)
Why is node + 0 hybrid fiber / coax (HFC ) network design preferred over a node + 6 HFC network design?
A node + 0 HFC design has no amplifier, where as a node + 6 HFC design has amplifiers that add noise and distortion to the amplified signal.
When a process in one computer operates at the same layer as a process in another computer, it is considered?
A peer.
Bottom layer protocol can only support communications between devices that are somehow physically connected, this connection can be describe as:
A point to point connection
Data added to a message that provides information about the message is called which of the following?
A protocol header.
What antenna type is ideal for making a point to point (P2P)network connection between two office buildings that are across the street from one another ?
A semi directional antenna
What test instrument is used to locate and measure interfering narrowband radio frequency (RF) signals in an IEEE 802.11 wireless local area network (WLAN), among other things?
A spectrum analyzer.
What is the half-duplex device that is only capable of open systems interconnection (OSI) reference model layer 2 (data Link Layer) connectivity ?
A wireless bridge.
An independent basic service set (IBSS) is also commonly referred to as which one of the following?
Ad hoc network
What is the least distributed migration strategy to docsis 3.1 from a previous docsis version?
Adding an orthogonal frequency division multiplexing (OFDM) channel to the downstream frequency spectrum
Which statement best describes protocol filtering that has been implemented in a wireless bridge?
Allowing or denying wireless traffic using open systems interconnection (OSI) reference model layer 4 (transport Layer) ports to filter layer 7 (applications layer) applications.
Which elements of a hybrid fiber / coax (HFC) Network are most likely to cause a service outage because of component failure or loss of power
Amplifiers
What wireless local area network WLAN device can be described as a half duplex device with intelligent equivalent to that of a sophisticated ethernet switch?
An access point (AP)
Computer busses have two parts
An address bus and a data bus.
What is multiplexing?
An efficient method of sharing a common medium for the transport of signal over the air (OTA) or through metallic and fiber optic cable.
What causes co-channel interference in a wireless local area network (WLAN)?
An overlap in the signal ranges of access points (AP) or different WLANS operatin on the same channel.
What types of applications are most suitable for time division multiplexing (TDM)
Applications where the transmitted signal is of non-continuos duration.
In which of the following applications might a wireless local area network (WLAN) be deployed in a distribution layer role?
As a building to building bridge used to link corporate network segments.
In what two ways is the gateway used?
As a router and a protocol converter.
What is a slot time in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 wireless local area network (WLAN)?
As with a clocks second hand there are 60 slots per minute to insert interframe spaces in a WLAN.
Which of the following is the portion of a network that connect other segments or network to one another?
Backbone
Why would a wireless local area network (WLAN) administration rarely see the "authenticated" step on the access point (AP)?
Because clients pass the authentication stage and immediately proceed into the association stage.
Why are exclusion bands within docsis 3.1 24mhz orthogonal frequency division multiplexing (OFDM) channel forbidden?
Because the guard bands are 1MHz and there must be at least 22 MHz or more of continuous modulated OFDM subcarriers
The lowest layer of a protocol stack communicates with which one of the following?
Binary Bits
When first activating Proactive Network Maintenance (PNM) in your network, what is one approach to avoid being overwhelmed by the number of identified problems?
Build a spreadsheet with thresholds set so that the worst performing portion of the network can be identified and corrected first.
How does frequency division multiplexing (FDM) enables multiple signal to share a common medium?
By assigning each signal a specific frequency and bandwidth or channel in tv jargon.
How does spread spectrum technology reduce the probability of signal jamming?
By transmitting over a wide frequency spectrum
What media access control (MAC) method do wireless local area network (WLAN) use?
Carrier sence multiple access with collision avoidance CSMA/CA remember CA
What media access control MAC method does ethernet use?
Carrier sense multiple access with collision detection CSMA/CD. remember CD
The section of a computer that executes the instructions in a program and directs the flow of information within the computer is which of the following
Central Processing Unit (CPU)
What security service in an enterprise wireless gateway enables the wireless network administrator to assign levels of service to a particular user?
Class of service (CoS).
What are the two types of orthogonal frequency division multiplexing (OFDM) pilot subcarriers?
Continues and scattered pilot subcarriers.
Which type of pilot subcarriers can be identified on a spectrum analyzer screen capture of an orthogonal frequency division multiplexing (OFDM) channel?
Continuous pilot subcarriers
A significant difference between a T1 line and a Fractional T1 (FT1) line is
Control over the physical end points
A network interface card (NIC), aka media access control (MAC) address, resides at the BLANK layer and a logical address resides at the BLANK layer.
Data Link/ Network
Asynchronous Transfer Mode (ATM) operates at which layers of the open systems interconnection (OSI) model?
Data link and physical Layers.
What unit of measurement is used to express the gain of an antenna?
Decibels isotropic (DBI)
In a segmented wireless local area network (WLAN) that has a different internet protocol (IP) address for each segment, which solution allows mobile client to maintain their connectivity when roaming into different segments?
Deploying all access points (AP) on a single virtual local area network (VLAN) using a flat IP subnet for all APS so that no chance of IP address for roaming clients occurs and all traffic goes through a central controller.
Although there are many different implementations of spread spectrum technology, what are the only types specified by the FCC in the code of federal regulations (CFF)volume 47 part 15?
Direct sequencing spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS). Remeber DSSS and FHSS and Direct squencing, not Direct Structure.
What challenges do wireless internet services provider (WISP) have to overcome in order to provide " last mile data delivery " to customers?
Distance to access points (AP), rooftop access, lightning, trees, mountains, towers access, and other physical obstacles to connectivity
Because they use different transmission and coding schemes the docsis 3.1 physical (PHY) layer is incompatible with the phy layer of previews docsis versions. How does docsis 3.1 comply with the requirements of compatibility with previous docsis version ?
Docsis 3.1 has two phy layers, one for previous docsis versions and another for docsis 3.1. Both layers can operate simultaneously or individually.
As a general rule, how does an increase in effective isotropic radiated power (EIRP) relate to the link budget range?
Each 6 decibels (dB) increase in EIRP equates to a doubling of range.
Why is the upstream vulnerable to impairments created inside every connected customer premises?
Each modem has access to the upstream in which the transmitted signals from modems are transported over a common path.
Which is often the most convenient place to run vertical cabling in a multistory building?
Elevator Shafts
In what direction does an omnidirectional antenna radiate radio frequency (RF) energy?
Equally in all directions around it's axis.
What specific problem does a wireless local area network (WLAN) resolve for corporations and home users?
Excessive data cabling
What is used in orthogonal frequency division multiplexing (OFDM) to transform the serial data stream from the time domain to multiple subcarriers in the frequency domain?
Fast fourier transform (FFT) algorithms compute the discretedFourier transform (DFT)
In docsis 3.1 the cable modem termination system (CMTS) can support up to 16 downstream profiles per orthogonal frequency division multiplexing (OFDM) channel, but the modems support only how many profiles per OFDM channel?
Four active profiles plus one inactive spare profile (4+1) per OFDM channel.
Which of the following is used by bridges to make bridging decisions?
Frame addresses
Which is a connection oriented network service that works at the data link layer to carry traffic over virtual circuits?
Frame relay service
The data link layer perceives bits as logical groupings called?
Frames
Where does the docsis 3.1 modem acquire its operating parameters when first powered up or initialize?
From either non volatile memory or from a valid primary downstream channel.
Where does the docsis 3.1 modem gather its downstream channel parameters from when an orthogonal frequency division multiplexing (OFDM) channel is found?
From the physical link channel (PLC) that is within the OFDM channel.
Compare to logical topologies Physical topologies
Give more details about a network connectors , cabling, and wide area links.
What is a consideration when mounting a high-gain omnidirectional antenna indoors on the ceiling?
If the ceiling is to high, the coverage area might not reach the floor where the users are located,
In what manner do radio waves propagate (move) away from the source (antenna)?
In a straight line in all directions at once.
What is the advantage of the multi profile capability of docsis 3.1 over legacy single profiles?
In multi profile systems the data throughput is optimal for the network conditions.
Why are the highest tiers of high speed data (HSD) service's typically a fraction of the docsis downstream capacity?
In order to confidently provide subscribed tier speed to all customers.
What benefits were cited by the broadband cable operators that utilize docsis 3.0 proactive network maintenance (PNM) in their Network?
Increase customers satisfaction and reduce operational expenses.
What can be done to increase the coverage area of a wireless local area network (WLAN)?
Increase the transmission power, replace the omnidirectional antenna with a parabolic antenna, and use the 2.4 GHz radio band instead of the 5 GHz radio band.
The typical users of network management and utility software are
Information systems personnel and network administrators.
Which term describes the operation mode of a basic service set (BSS)?
Infrastructure mode.
In addition to amplifying the signal what else does an amplifier do?
It adds a small amount of noise and distortion that doubles each time the numbers of cascaded amplifiers double.
What is the purpose of the distributed coordination function (DCF) in an IEEE 802.11 wireless local area network (WLAN)
It allow all clients on a WLAN to contend for access on the shared radio frequency (RF) transmission medium using the carrier sense multiple access with collision avoidance (CSMA/CA) protocol.
Which statement describes a bottom layer protocol?
It communicates over direct physical links.
Why is it of concern if a modem is constantly adjusting its output transmission level?
It could indicate an intermittent condition in the network that needs to be identified and corrected.
Why is the public switched telephone network (PSTN) typically used to connect local area networks (LAN) with a wide area network (WAN)?
It is prohibitively expensive to install the physical link between LANs and the PSTN is already installed.
Random access memory (RAM) is volatile, which means that?
It loses stored data when power is lost
Which statement describes a passive injector?
It places direct current (DC) voltage onto a CAT-5e cable.
What happens when an active ethernet switch fails to sense a power over ethernet (POE) device on a port?
It switchs off the direct current (DC) voltage on that port
Why is direct sequence spread spectrum (DSSS) the most widely known and the most used of the spread spectrum types?
Its ease of implementation and high data rates.
Under equal network conditions, what advantage does low-density parity check (LDPC) forward error correction (FEC) coding have over Reed-Solomon (RS) coding?
LDPC is able to correct errors at orders of modulation that are higher than that of RS coding.
The docsis mac and upper layer protocol interface (MULP) specification extends through which layer of the open systems interconnection (OSI) reference model?
Layer 2 through layer 7,
When two or more nodes share some downstream and upstream channels, and have others unique to each node then the nodes are in the same media access control MAC domain by virtue of sharing some channels. What are the channels that are unique to each node in the mac domain called?
MAC Domain-Cable Modem- Service Groups ( MD- CM-SG).
Which one of the following conditions occurs when an access point (AP) receiving a distant client's signal at a lower power level than that of a nearer client?
Near / Far
Which of the following layer below is most concerned with getting a packet through a network from a source through intermediate nodes, to the final destination?
Network
What modulation technique does Institute of Electrical and Electronics Engineers (IEEE) wireless local area network (WLAN) standards 802.11a, 802.11n, and 802.11ac use to achieve higher data throughput?
Orthogonal frequency division multiplexing (OFDM)
What were the original downstream channel assignments used on hybrid fiber/coax networks based upon?
Over-the-air TV channel assignments.
Why is the practical data rate of 256-QAM, 6MHz wide single carrier channel only about 38 megabits per second (Mbps) when the raw data is 42.88 Mbps?
Overhead drops the practical data rate to about 38 mbps.
What is formed at the network layer after header data is added to the data passed down from the layer above (transport layer)?
Packets
What type of connectivity is needed to connect networks between two buildings located across the street from each other?
Point to point (P2P)
T3 and synchronous optical networks (SONET) are considered?
Point to point services ( links options)
Which of the following power management modes populates a traffic indication map (TIM) in a basic service set (BSS) or extended service set (ESS)?
Power save polling PSP mode.
The ratio of the chipping code to data bits for direct sequence spread spectrum (DSSS) signal is called which of the following ?
Processing gain.
What is a characteristic of profile A, because it is the boot profile, that docsis 3.1 modems first begin receiving when they initialize and register?
Profile A should have relatively low bit loading to ensure that it is received by all modems.
A server is a computer that
Provides resources to other computers.
How does radio frequency line of sight (RF LOS) differ from visual LOS?
RF LOS is accompanied by a Fresnel zone, a series of concentric ellipsoid shaped areas around the visual LOS path.
Which of the following radio frequency (RF) behavior is defined as the "bending of a wave as it passes through a medium of different density"?
Refraction
The classification of software used for telecommuters is referred to as
Remote access.
Decapsulation means that each layer in the protocol stack does which of the following?
Removes its protocol header and passes the whole message up the protocol stack
Because the primary job of the OSI presentation layer is to deal with the format of computing information, the presentation layer would be better named the:
Representation layer
Which one of the following task is the best choice for troubleshooting the near / Far problem?
Review the location of the stations (clients) on the Network.
You are designing a wireless network to which several functional work groups are connected. You want to configure your enterprise wireless gateway to allow you to quickly assign identical network access rights to persons within the same work group. Which enterprise wireless gateway feature provides this capability?
Role-base access control (RBAC)
What distinguishes routers from switches and bridges ?
Router operates on packets; switches and bridges operate on frames.
What application / presentation layer protocol is used by a windows clients retrieving files from a file server ?
Server message block (SMB)
The layer of the OSI model that controls the way information flow between processes is which of the following?
Session
Which type of interframe space provides the highest level of priority network function control over the medium for a short time period?
Short interframe space (SIFS)
What is the tradeoff between the fragmenting of packets into shorter fragments versus keeping longer packet fragments
Shorter packet fragments have lower probability of errors from interference then longer packet fragments, but shorter packet fragments required more errors correction
The physical layer is responsible for transmitting and receiving?
Signals that represents data bits.
Why is spectrum technology used in applications such as Bluetooth wireless personal area network (WPAN)
Spread spectrum technology allows wireless networking to create a short range personal communications network.
Which multi profile approach established a strict hierarchy among the profiles and is the simple to implement
Static profile
What are some common methods used to configure and manage access points (AP)?
Telnet/ssh (secure shell) universal serial bus (usb) and a built in web server for browser access
How do you troubleshoot a hidden node?
Test for degraded data throughput at all client locations.
When connecting to a wireless local area network (WLAN) , what is the most important fact about the service set identifier (SSID)?
That the clients and all access points (AP) must be configured with matching SSID's.
Besides data rates what is the difference between the institute of electrical and electrics engineers (IEEE) 802.11a and 802.11b wireless standards?
The 802.11a uses 5.8 GHz range and the 802.11b uses the 2.4 GHz range.
What is the DOCSIS 3.1 data rate capacity when a DOCSIS 3.1 orthogonal frequency division (OFDM) channel is bonded to legacy DOCSIS 3.0 bonded channels?
The DOCSIS 3.1 OFDM channel adds to capacities of the legacy DOCSIS 3.0 bonded channels.
In modular cable modem termination systems (MCMTS) architecture, what automatically compensates for cable length and ensures that the M-CMTS clients have the same sense of time and frequency?
The DOSCIS Timing Interface (DTI) server.
A bridge normally operate at which of the following layer of the open systems interconnection (OSI) model?
The Data Link Layer
In which open systems interconnection (OSI) reference model layer do wireless local area network (WLAN) operate?
The Data Link Layer
A switch normally operates at which of the following layers of the open systems interconnection (OSI) model?
The Data Link Layers
Which organization regulated the use of wireless cable network WLAN devises in the United states
The Federal Communications Commission (FCC.)
What does the docsis media access control (MAC) layer use to instruct the cable modem termination system (CMTS) how to route signal internally?
The MAC Domain cable modem service group (MD-CM-SG)
A router normally operates at which layer of open system interconnection (OSI) model
The Network Layer
What must be understood when placing a docsis 3.1 orthogonal frequency division multiplexing (OFDM) physical link channel (PLC) in the downstream spectrum?
The PLC carries essential information and should be placed in a portion of frequency spectrum that has little noise and minimal ingress and interference
In order to keep records, tables are constructed in the cable modem termination system (CMTS). Which table provides the CMTS enough information to ensure that there are no conflicts in frequency assignments?
The Topology Configuration Table.
As a subscriber enters a hot spot area what signals their mobile wireless device of an available wifi network?
The access point (AP) advertises to the wireless device to enable connection.
Why is share key authentication considered a security risk in a wireless local area network (WLAN)
The access point (AP) transmits the challenge text in the clear and receive the same challenge text encrypted with the wired equivalent privacy (WEP) key.
Which of the following represents the basic definition of a collision domain?
The area of network where all nodes receive all frames transmitted.
What comprises the measurable energy in an orthogonal frequency division multiplexing (OFDM) channel?
The channel's encompassed frequency spectrum minus the unmodulated spectrum in the internal excluded subcarriers and exclusion bands.
How does a client locate a wireless local area network (WLAN) when performing passive scanning?
The client listens for beacons until it hears a beacon listing the service set identifier (SSID) of the network it expects to join.
In a client computer what program is responsible for determining whether a requested resources is local or located across the network?
The client redirection software.
Why has it become cost effective for enterprise companies to integrate wireless local area network (WLAN) segments into their network?
The cost of wireless technology has decreased and the quality has increased
What relationship must be maintained when optimizing cyclic prefix and window parameters?
The cyclic prefix sample length must be longer than the roll of period sample length.
Why should a wireless network administrator consider installing an enterprise wireless gateway in their network?
The enterprise wireless gateway enables the wireless network administrator to manage a large wireless network using only a few central device instead of a large number of access points.
Why is Fresnel Zone important to the integrity of the radio frequency (RF) link or path?
The fresnel zone defines an area around the RF line of sight (RF LOS) that can introduce RF signal interference if blocked
In docsis 3.1 proactive network maintenance (PNM), what serves as the device under test ( DUT)?
The hybrid fiber/ coax (HFC) network
Which component of frequency hopping spread spectrum (FHSS) system create more overhead than any similar component in a direct sequence spread spectrum (DSSS) system?
The interframe spacing
Where does the modem , operating in docsis 3.1 mode tune to reduce data when the downstream contains an orthogonal frequency division multiplexing (OFDM) channel and single carrier quadrature amplitude modulation (SC-QAM) channels?
The modem tunes to the OFDM channel and the SC-QAM channels, and receive data on both.
What happens if the cable modem receives two different data carriers at the same time?
The modem will hear unintelligible mush and neither carrier is received.
What happens if a sending node wants to transmit data that is no longer than the maximum packet size?
The network layer split the data into more then one packet
Which type of cable modem termination system (CMTS) table translate (or maps) a node number with a fiber node name?
The node configuration table
When several nodes share the same transmission medium ( hub, switch, or radio channel) each node will receive the frame transmitted between client and server, and vice versa . Which node will process the information inside the frame?
The node with network interface card (NIC) address that matches the destination address is the ethernet frame header.
Why are the frequency assignments in the frequency space diagram based on the nodes?
The nodes are where the most frequency congestion can occur.
What indicates an adaptive equalizers level of sampling and correction capability?
The number of taps in the delay line.
Basic computer functions such as reading and writing files and managing input out put I/O request are performed by which of the following?
The operating system.
In the docsis architecture what perform the back office task that provision, configure, and manage cable modem operations?
The operational support system (OSS)
In order to route data to best serve all customers, what does configuration of the cable modem termination system (CMTS) depend on ?
The physical layout of the network
What is equivalent isotopically radiated power (EIRP)?
The power actually radiated by the antenna element.
Which of the following describes how protocol layers work together?
The receiving protocol layer uses the service of the layer below it and provides services to the layer above it.
What does the term "binary" indicate about a signal?
The signal only has two values representing the digital bits one and zero.
In a frequency hopping spread spectrum (FHSS) system that use 10 frequencies across a 12 megahertz (MHz) frequency band, what happen if narrowband interference occurs at only one of the 10 frequencies?
The spread spectrum signal remains intact. Instead of being lost. The data on the interfered frequency is retransmitted on one of the other nine frequencies.
On a PreEqualization Analyzer's tap response, what does a digital tap that is less than 10 dB lower than the main tap indicate?
There is a severe micro-reflection in the upstream.
How are inter frame spaces used in an IEEE 802.11 wireless local area network (WLAN)
They are used to defer a station access to the medium and provide various levels of priority.
In order for a channel to be in the same bonding group they must meet which of these criteria ?
They must be on the same media access control (MAC) domain
What purpose do protocol serve in computer networking
They provide rules for communications
What are some measures that can be taken to prevent high voltage standing wave ratios (vswr) in transmitters and receivers?
Tighten connections between cables and connectors and use impedance-matched hardware throughout.
What docsis 3.1 feature enables an operator to use the same upstream frequency spectrum for docsis 2.0,3.0 and 3.1?
Time and frequency division multiplexing (TaFDM)
what is the purpose of the Institute of Electrical and Electronics Engineers (IEEE) 802.11 wireless local area network (WLAN) superframe?
To allow fair coexistence between point coordination function (PCF) mode and distributed coordination function (DFC) mode clients on the network
What was the motivation for the conception of the converge cable access platform (CCAP)?
To combine digital television (DTV) and docsis operations from a common unified platforms.
What is the purpose of the cyclic prefix ( CP)
To compensate for micro-reflections in the transmission path by providing a protective interval between successive orthogonal frequency division multiplexing (OFDM) symbols.
What does the "on with threshold" setting of the request to send/clear to send (RTS/CTS) protocol allow the wireless local area network (WLAN) administrator to control?
To control which frames over a certain size are announced and cleared to sent by the stations
Which of the following is a function of the session layer?
To facilitate a step by step interaction between two entities.
What are the three main conditions that influence the range of a wireless local area network (WLAN)?
Transmission power, antenna type and location, and environment.
What are the responsibilities of the physical layer (Layer 1) in the open system interconnection (OSI) reference model and docsis?
Transmission streams of data bits
The primary purpose of a network layer protocol is to
Transmit packets between source and destination nodes that may not be connected by the same physical link
Which of the following describes the generally accepted function of a broadband network?
Transport multiple concurrent signals on the same physical medium?
How might you confirmed the presence of a hidden node on the network?
Turn on the request to send / clear to send RTS/CTS protocol and watch for increased network data throughput.
What over the top (OTT) delivered content could cause the current broadband network data rate to become inadequate?
Ultra-high definition TV (UHDTV) content.
Which of the following operating systems (OS) has reliability functionality, and stability beyond question?
Unix
What does docsis 3.1 employ to fully utilize the entire upstream spectrum at maximum capacity while maintaining backward compatibility with docsis 3.0?
Upstream channel bonding and time frequency division multiplexing (TAFDM)
You wish to build a wireless network that provides significantly better throughput than a single IEEE 802.11b access point (AP ) which of the following is an acceptable solution?
Use IEEE 802.11-compliant equipment operating in the 5 GHz unlicsensed national information infrastructure (U-NII) bands, allowing for more more non-overlapping channels.
The open systems interconnection (OSI) model was developed so that
Users could connect to the internet using hardware manufacture by any company.
Which of the following is an advantage of a switch service over a point to point service?
Variable capacity is available with switch services,
Which of the following describes the processes of frequency modulation (FM)
Vary the signal frequency and hold the signal amplitude constant
Why are wireless local area network (WLAN) usually deployed in an access capacity instead of as the Network core layer?
WLANS are generally incapable of meeting the requirements of the network core layer which needs to be very fast and stable, able to handle a tremendous amount of traffic with little difficulty, and most experience no down time
What causes the hidden node problem in a wireless local area network (WLAN)
When a client or node can receive signal from an access point (AP) but an obstacle prevents the client from receiving signals from the other clients that are connected to the network.
When should you consider enabling requests to send/clear to send RTS/CTS protocol on a wireless local area network (WLAN)?
When diagnosing network problems and when large frames experience high collision rates across a congested wireless network.
Which statement best describes a Network application for which a wireless workgroup bridge is the best suited?
When remote buildings house small groups of wired clients needing wireless access to the main network
A frame relay network uses a process known as bandwidth on demand, which of the following describes this concept?
When there is a data to be sent, the bandwidth is used.
How is collision detected in carrier sence multiple access with collision detection (CSMA/CD)?
While transmitting the node listens to the bus , comparing the receive frame to what was transmitted. If the receive frame is different than what was transmitted a collision is assumed,
Which operating system (OS) was the first to support the plug and play standard?
Windows 95.
Residential gateway have been around for quite sometime but what capability was added to connect to institute of electrical and electronics engineer (IEEE) 802.11b, 802.11g, 802.11n and 802.11ac compliant devices?
Wireless capability
Which wireless client devices required drivers to be installed on the client node?
Wireless client devices on printed circuit (PC) cards that are to be installed in peripheral component interconnect (PCI) or industry standard architecture (ISA) adapters.
Which of the following networks or products use spread spectrum technology ?
Wireless local area network (WLAN), Bluetooth, and Global Positioning System (GPS)
When traffic on a local area network (LAN) starts to cause performance problems, what Layer 2 device can be installed to reduce the load by dividing the network into separate segments?
a bridge
The overall data copying capacity of a bus is represented by the units
bandwidth
The unit of information used by an asynchronous transfer mode (ATM) network is the ?
cell
A layer 2 switch is used to switch
frames
The most complex internet working device is the:
gateway
Polarization is define as which one of the following ?
the orientation of an electromagnetic waves's electric field in relationship to the earth's surface or plane.
