Telecomm and Wireless Communications - D413 Flashcards
What is bandwidth?
The maximum theoretical capacity of a network communication link
Which factor contributes to signal attenuation?
Noise
Which term is defined as the number of cycles a signal completes in one second?
Frequency
How is phase defined?
A wave position relative to a reference position
What is the absolute value of a signal’s greatest magnitude in proportion to the energy that it is able to carry?
Peak amplitude
What is one advantage of twisted-pair cables over fiber-optic cables?
They require less skill and experience to install.
What is one characteristic of coaxial cables?
They use a dielectric insulator to reduce electromagnetic field interference.
What is a characteristic of fiber-optic cables?
They are composed of a core, cladding, a buffer, and a jacket.
What is one advantage of fiber-optic cables?
Fiber-optic cables can be used in safety-critical places.
What is one drawback of fiber-optic cable?
It contains fragile components.
What is one type of waveform used to transmit electromagnetic signals in wireless media?
Radio waves
What is the wireless service that enables people to have access to mobile internet?
Cellular digital packet data (CDPD)
Which waves have higher frequencies than infrared transmission frequencies?
Visible light waves
Which type of waves are used in Bluetooth transmission?
Low-power radio waves
What is a source of industrial noise?
Electric motors
Which cable realizes noise protection with the use of foil shielding?
A cable transmitting signals between 15 and 20 kHz
What is one advantage of the cyclic redundancy check (CRC)?
It detects a large proportion of possible errors.
How are stutters counteracted to improve the quality of Voice over Internet Protocol (VoIP)?
By installing jitter buffers
When using a campus network, a college student consistently notices slow-moving connectivity in the afternoon but not in the morning.
What causes this problem?
There is greater network congestion in the afternoon.
Which wireless security feature hides the contents of network packets to ensure data can be transmitted over a wireless network safely?
Encryption key
Which multiplexing technique transmits each signal from one input source via a single time slot through the creation of different slots?
Synchronous time-division multiplexing
Which category of multiplexing randomly allocates time slots to different data signals depending on the rate at which they are being generated from the source?
Asynchronous time-division multiplexing
Which type of modem has been branded as a broadband device?
Cable modem
Which type of modem has the slowest transmission rate?
56k modem
Which networking component is used to provide a device with a wireless connection point to a network?
Router
Which network component facilitates the connection of a network device to other network devices and to the internet?
Router
A network administrator wants to extend the range of wireless connectivity within the network.
Which device is used for this purpose?
Repeater
A network engineer needs to connect two network devices that are 150 meters apart using Cat 5e cable.
Which network component can be used to facilitate improved signal transmission in this case?
Repeater
A network administrator is asked to provide a single private /24 subnet for a new network segment from the company address management tool.
Which classless inter-domain routing (CIDR) notation will be used to represent a private /24 subnet?
10.0.0.0 255.255.255.0
Two computers need to be directly connected within a network.
Which Ethernet cable should be used to connect the computers?
Straight-through
A student is researching how personal devices connect to other devices using Bluetooth technology.
Which IEEE standard working group can the student reference to learn more about Bluetooth connections?
802.15
Which IEEE 802.11 wireless standard has the highest data rate?
802.11n
Which networking feature prioritizes time-sensitive packets traveling across the network?
Quality of service
What is the purpose of using a RADIUS server in conjunction with a wireless network?
To provide an authentication mechanism for users connecting to a network
What is the purpose of documenting network policies and procedures?
To provide clear rules regarding how the network should or should not be used
An error-detection algorithm exists that identifies corruption in transmitted data; however, it produces additional data that are transmitted along the network.
Which error detection method has this drawback?
Cyclic redundancy check
What should an engineer plan to do to prevent a broadcast storm while designing a network for a growing manufacturer?
Segment the network to reduce collisions.
What is the importance of allowing a Dynamic Host Configuration Protocol (DHCP) lease to expire?
To allow IP addresses to become available for new clients within a specified address pool
A hospital is concerned about the vulnerability and slow speed of its network. The network administrator has already identified that many unknown devices are connected to its wireless network.
What should the network administrator do to reduce these issues?
Create a guest wireless network
A network technician has been given a requirement to expand the copper network in their company’s leased premises, which has lately added three new offices. In the currently leased area, the distance between the offices and the network’s closest node is roughly 101 m. When testing a test connection run between the two areas, the technician sees a significant level of attenuation.
Which device will enable the technician to boost the poor signal and connect the entire rental office?
Repeater
Which assessment is the first part of the design process?
Needs
Which electrical system is required for network equipment according to industry standards?
Isolated
A technician needs to monitor a newly deployed Lightweight Directory Access Protocol (LDAP) server to get a set of baseline information for it.
Which time of the day is most optimal for the technician to start these measurements?
Morning
What should be a mandatory component of organizational training for new network users?
Training that educates them on security and uses based on the company policy and procedure
A network engineer has been tasked with adding additional network capacity to a regional remote access hub. They are given the following diagram as part of the documentation to use for the update.
Which action should the engineer take before ordering any new equipment or service?
They should take a baseline network capacity measurement of the internet service provider (ISP), hardware virtual private network (VPN), and software VPN.
The dynamic multipoint virtual private network (DMVPN) topology shown below has a central connection for the regional headquarters.
What is the purpose of the central connection point to the sales offices outside the virtual private network (VPN) connectivity?
If one sales office lost connectivity to the regional headquarters, the other sales office would continue to operate without being affected.
A network administrator needs to provide limited access to guests and contractors as well as prevent unauthorized users’ access.
Which modification to the following network diagram will support both access scenarios?
A firewall should be added between the guest wireless access point (WAP) and the corporate network.
How many collision domains are represented in the following network diagram?
9
The given network diagram shows a multilayered and segmented office network.
Which information was been omitted that would allow for proper connectivity of the different network segments with each other?
The network needs an interior gateway protocol (IGP) routing solution.
A network is configured according to the network diagram. System D is experiencing packet data loss and connectivity issues.
What is causing the loss of data packets and connectivity issues?
The maximum cable length is exceeded.
The network diagram with the following instantaneous bandwidth and cabling is used to represent the layout of a network. What is the flaw in the network diagram?
The bandwidth between systems C and D is unattainable.
A network is arranged using the cables shown in the network diagram. The necessary transmission rates for cabled connections are labeled. How can the cabling problem within the network diagram be fixed?
Change the internet-router cable to Cat 7a.
A company is developing a television network to broadcast local news content using analog signals.
Which multiplexing technique should be used?
Frequency-division multiplexing
A network administrator is setting up a network that will utilize lasers to send analog data through fiber-optic cable.
Which multiplexing technique should the administrator use?
Wavelength-division multiplexing
Which type of multiplexing is used to send and receive digital signals between connected devices?
Time-division multiplexing
