Computer Networking Exam Prep
Questions and Answers
Asymmetric Access - ✔✔Access networks which provide different downstream
and upstream rates
Cable Internet Access - ✔✔Uses the existing cable line to exchange data with a CMTS at
the cable head end; shared Internet medium
Cable Modem Termination System - ✔✔CMTS
Hybrid Fiber-Coaxial Access Network - ✔✔HFC
Fiber to the Home - ✔✔FTTH
Optical Network Terminator - ✔✔ONT
Optical Line Terminator - ✔✔OLT
ONT - Optical Splitter - OLT - ✔✔Order of FTTH from home to CO
Local Access Network - ✔✔LAN
Ethernet - ✔✔Users use twisted-pair copper wire to connect to an Ethernet switch, which
is itself connected to a router and then to the LAN's ISP
,WiFi - ✔✔Wireless LAN access based on IEEE 802.11 technology
Wide-Area Wireless Access - ✔✔3G and LTE wireless roaming technologies
Long-Term Evolution - ✔✔LTE
Physical Medium - ✔✔Transports bits between transmitter-receiver pairs
Guided Media - ✔✔Waves are transmitted along a solid medium
Unguided media - ✔✔Waves propagate in the atmosphere
Unshielded Twisted Pair - ✔✔UTP: Commonly used for LANs
Twisted-Pair Copper Wire - ✔✔Medium of choice for high-speed LAN networking
Coaxial Cable - ✔✔Medium of choice for cable television companies
Fiber Optics - ✔✔Fasest medium
Geostationary Satellites - ✔✔Satellites which remain above the same spot on Earth
Low-Earth Orbiting Satellites - ✔✔Satellites which are close to Earth to reduce
propagation delay
Network Core - ✔✔The collection of package switches and links that interconnect
the Internet's end systems
, Messages - ✔✔Information exchanged between end systems in a network application
Store-and-Forward Transmission - ✔✔Type of packet switching that requires the entire
packet to arrive before it can begin to transmit the first bit of the packet onto the outbound
link
Output Queue - ✔✔Stores packets that the router is about to send into an outgoing link
Queuing Delays - ✔✔Delays that are caused by an already-busy outgoing link
Packet Loss - ✔✔Occurs when a packet arrives to a packet switch and the output queue
is completely full
Forwarding Table - ✔✔A data structure within a router that maps destination address
to outbound links
Routing Protocols - ✔✔Used to automatically set forwarding tables
Circuit Switching - ✔✔Resources needed along a path to provide for
communication between two end systems are reserved for the duration of the
communication session
Packet Switching - ✔✔Resources needed along a path to provide for communication
between two end systems are not reserved for the duration of the communication session
Circuit - ✔✔A connection between two end systems that maintains a constant
transmission rate within the network links
Questions and Answers
Asymmetric Access - ✔✔Access networks which provide different downstream
and upstream rates
Cable Internet Access - ✔✔Uses the existing cable line to exchange data with a CMTS at
the cable head end; shared Internet medium
Cable Modem Termination System - ✔✔CMTS
Hybrid Fiber-Coaxial Access Network - ✔✔HFC
Fiber to the Home - ✔✔FTTH
Optical Network Terminator - ✔✔ONT
Optical Line Terminator - ✔✔OLT
ONT - Optical Splitter - OLT - ✔✔Order of FTTH from home to CO
Local Access Network - ✔✔LAN
Ethernet - ✔✔Users use twisted-pair copper wire to connect to an Ethernet switch, which
is itself connected to a router and then to the LAN's ISP
,WiFi - ✔✔Wireless LAN access based on IEEE 802.11 technology
Wide-Area Wireless Access - ✔✔3G and LTE wireless roaming technologies
Long-Term Evolution - ✔✔LTE
Physical Medium - ✔✔Transports bits between transmitter-receiver pairs
Guided Media - ✔✔Waves are transmitted along a solid medium
Unguided media - ✔✔Waves propagate in the atmosphere
Unshielded Twisted Pair - ✔✔UTP: Commonly used for LANs
Twisted-Pair Copper Wire - ✔✔Medium of choice for high-speed LAN networking
Coaxial Cable - ✔✔Medium of choice for cable television companies
Fiber Optics - ✔✔Fasest medium
Geostationary Satellites - ✔✔Satellites which remain above the same spot on Earth
Low-Earth Orbiting Satellites - ✔✔Satellites which are close to Earth to reduce
propagation delay
Network Core - ✔✔The collection of package switches and links that interconnect
the Internet's end systems
, Messages - ✔✔Information exchanged between end systems in a network application
Store-and-Forward Transmission - ✔✔Type of packet switching that requires the entire
packet to arrive before it can begin to transmit the first bit of the packet onto the outbound
link
Output Queue - ✔✔Stores packets that the router is about to send into an outgoing link
Queuing Delays - ✔✔Delays that are caused by an already-busy outgoing link
Packet Loss - ✔✔Occurs when a packet arrives to a packet switch and the output queue
is completely full
Forwarding Table - ✔✔A data structure within a router that maps destination address
to outbound links
Routing Protocols - ✔✔Used to automatically set forwarding tables
Circuit Switching - ✔✔Resources needed along a path to provide for
communication between two end systems are reserved for the duration of the
communication session
Packet Switching - ✔✔Resources needed along a path to provide for communication
between two end systems are not reserved for the duration of the communication session
Circuit - ✔✔A connection between two end systems that maintains a constant
transmission rate within the network links
