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CNIT 240,344 Final Exam Graded A+ 2024
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CNIT 240,344 Final Exam Graded A+ 2024
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CNIT 240/344 Final Exam Graded A+ 2024(T/F) a packet can be forwarded without a route? - ANSWER-false
(T/F) an error sending an ICMP message can generate another ICMP message
informing of the error - ANSWER-false
(T/F) broadcast and multicast message cannot create ICMP messages - ANSWER-true
802.11 - ANSWER-wireless/WLAN
802.15 - ANSWER-PAN/bluetooth
802.1Q - ANSWER-VLAN trunking/tagging
802.2 - ANSWER-logical link control
802.3 - ANSWER-ethernet
802.3 frame - ANSWER-7 byte preamble, 1 byte delimiter, 6 byte dest, 6 byte src, 2
byte length, 42-1500 byte payload, 4 byte frame check sequence
Ad Hoc/Independent BSS - ANSWER-Wireless network that operates without APs
adding port to vlan - ANSWER-conf t > interface [interface] > switchport mode access >
switchport access vlan [id]
address resolution protocol (ARP) - ANSWER-maps an IPv4 address to a MAC address
advantages of a switch - ANSWER-no contention/CSMACD; ports operate in parallel
Amplitude modulation - ANSWER-Data signal changes the amplitude of the carrier
wave, leaving frequency the same
Analog bandwidth - ANSWER-Fmax-Fmin
Application layer - ANSWER-interface between user applications and network's services
via APIs; HTTP; SSH
Association - ANSWER-Allows client to join WLAN network
Asynchronous - ANSWER-Signal based (start/stop bits); sync must be re-established
every communication cycle
Auto-negotiation - ANSWER-auto set link speed and duplex mode
,automatix repeat request (ARQ) - ANSWER-sender and receiver exchange message to
ensure all data arrives correctly
Bandwidth - ANSWER-Theortical max
basic service area - ANSWER-coverage area for both IBSS and BSS
basic service set (BSS) - ANSWER-a group of stations that communicate with each
other
Basic service sets - ANSWER-Single AP that manages the wireless parameters and
topology
beacons - ANSWER-frames used by WLAN to advertise its presense
blocked port - ANSWER-forwards no traffic to other bridges or switches, only listens to
network management frames
broadcast - ANSWER-address used to send information to all hosts; all F for MAC
BSS identifer (BSSID) - ANSWER-MAC address of an AP to differentiate the BSS
can a router operate on all layers? - ANSWER-yes, if necessary
can NAT be used as a security protocol? - ANSWER-not alone, must be paired with
firewall to provide any kind of security
carrier sense - ANSWER-process to test the medium for current activity/data
transmission
Circuit switching - ANSWER-dedicated channel from src to dest; entire message is sent
without being split into packets; connection oriented
classless interdomain routing (CIDR) - ANSWER-allows to specify subnet mask without
worrying about address classes, provides the most granular control of network address
space
Coaxial cable - ANSWER-Insulated single copper wire that can run longer distance
Code division multiplexing - ANSWER-data stream is assigned to a unique orthogonal
code for use in the entire channel; overlapping data streams are ignored
collection detection recovery process - ANSWER-jam signal, random backoff interval,
retransmit
, collision detection - ANSWER-sample carrier and received signals to identify
dissimilarities
common distribution system - ANSWER-multiple APs in ESS apprea to be a single BSS
with common SSID
configuring trunk - ANSWER-conf t > interface [interface] > switchport mode trunk >
switchport trunk allowed [vlan id] (optional)
connected route type - ANSWER-a path to a network that has a direct connection to the
gateway
contention domain - ANSWER-every host competes to send data
continuous ARQ - ANSWER-sliding window and seq numbers; retransmission of
everything in the window from the error forward
convergence - ANSWER-when switch knows everything it needs to know, including
topology and STP
Copper media - ANSWER-STP, UTP, Cat5e/6, TIA568A/B
creating a VLAN - ANSWER-conf t > vlan [id] > name [name]
Crossover cable - ANSWER-Connecting similar devices
Cyclic Redundancy Check (CRC) - ANSWER-checksum based on the data
Data link layer - ANSWER-Manages frames for error-free data transfer point-to-point;
CRC integrity checking
Data link layer sub-layers - ANSWER-MAC; LLC
DCE connector - ANSWER-serial connector that transmits the clock signal
default route type - ANSWER-a path to a "helper" when the exact path to the network is
not known
Demodulation - ANSWER-Converting analong signal to digital bits
Demultiplexing - ANSWER-Taking a muxed signal and splitting back into original signals
describe the contents of the packets during the routing process - ANSWER-the source
IP is always the host computer, the destination IP is always the destination computer,
the source and destination MACs changes with each hop
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