Block 2 - Unit 4 Flashcards
_______ convert digital data to analog signals for transmission over a telephone line.
modems
Which converter changes analog signals to a digital (binary) representation?
A/D converter
The ________ converter converts a set of binary numbers into a specific voltage proportional to the binary number.
D/A converter
_______ _______ converters connect various types of cables that exist within a network.
Network media
A _____________ acts as a translator between two computers or networks that use different operating systems.
gateway
__________ filter packets between LAN segments.
switches
Switches read the __________ address of each packet and forward the packet to the correct port.
MAC address
The switching technique that checks the first 64 bytes of a frame for fragmentation before forwarding the frame is called ____________.
fragmentfree
The switching technique that stores the packet and performs an error check is the ________ ___ _________.
Store-and-forward
A __________ connects two or more LAN segments to make those segments one logical network.
bridge
Bridges forwards frames (or packets) of data based on the __________ _________ of the destined node.
MAC address
If the MAC address of the destined node is on the same segment, the data __________ cross the bridge.
Does not
Routers operate at what layer of the OSI reference model?
Network layer or layer 3
A router uses the __________ __________ information found in the network area of the data packet to determine where to forward a packet.
Network address
What devices are able to perform a dynamic load balance of communications traffic when alternative routes are available between networks?
routers
Wideband encryption devices encrypt data from ____________.
Many types of equipment.
but really only computer data
Narrowband encryption devices encrypt information from ___________.
telephones
Bulk encryption is a _____________ line obtained by combining multiple signals.
Multiplexed
Coaxial cable, twisted-pair cable, and/or fiber optic cable are examples of _________ __________.
Guided media
Coaxial cable used in Ethernet 10Base5 networks is known as ___________.
thicknet
Coaxial cable used in Ethernet 10Base 2 networks is known as ___________.
thinnet
The two types of twisted pair cable are ____________ and _____________.
Shielded twisted-pair (STP) and unshielded twisted-pair (UTP)
Shielded twisted pair (STP) cables are __________ to reduce noise both from inside and outside the cable.
Shielded
___________ is the most popular type of network cable.
UTP
Category ___________ UTP is not suitable for data transmission.
Cat 1
Category ___________ UTP is rated for data transmission speeds up to 100Mbps.
Cat 5
Fiber optic cables are immune to all types of EMF monitoring. (T/F)
True
Which guided media supports the longest segment length?
Single-mode fiber - SMF
Two types of unguided media are ____________ and ___________.
Light transmissions and radio waves
One problem with light transmissions is __________ conditions, such as fog, can degrade the signal.
atmospheric
Freedom of movement or ___________ is an advantage of unguided/unbound media.
mobility
Three disadvantages of unguided/unbound media are ___________, ___________, and __________.
Security, distortion and interference, and speed
TDM involves the distribution of __________ signals in the time domain.
multiple
A multiplexer combines several ________ or __________ signals for transmission over one single medium.
Data or voice
The primary purpose of using a multiplexer is to save on ________ ___________.
communication costs
Multiplexers use an error detection/correction scheme to ensure the ____________ of the transmitted data.
integrity
In order to tap into a multiplexed signal a person would have to know ________, _______, and _________________.
Link protocol, the individual channel assignment and the data formats
Wave division multiplexing combines several different data signals onto a single ___________ ___________ cable.
Fiber optic
Light signals are multiplexed by an ___________ _____________.
Optical combiner
The demultiplexer uses a _____________ ____________ to split the light into many channels.
Light splitter
Time division multiplexing (TDM) involves the distribution of multiple signals in a time domain. (T/F)
true
Time division multiplexing (TDM) transmits a fixed sequence of time slots over a __________ transmission channel.
single
Each user in TDM is assigned a specific _____ ______.
Time slot
If a user has no data to send using TDM, the user time slot __________ __________.
Stays empty
Which switching method check the CRC computation?
Store-and-forward
Which type of server acts as a workstation and a server?
Peer-to-peer
