CNIT 240/344 FINAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS A+ GRADED
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Course
CNIT 344
Institution
CNIT 344
Open System Interconnection (OSI)
7 layers for open interconnection between any two systems regardless of vendor
OSI rules
layers can only communicate with adjacent layers
OSI benefits
break network communication into more manageable parts and vendor agnostic
OSI layers
Physical,...
,Open System Interconnection (OSI)
7 layers for open interconnection between any two systems regardless of vendor
OSI rules
layers can only communicate with adjacent layers
K
OSI benefits
break network communication into more manageable parts and vendor agnostic
C
OSI layers
LO
Physical, Data Link, Network, Transport, Session, Presentation, Application
Physical layer
Transmission of bit stream; focus on signaling techniques; does NOT include physical media
YC
Data link layer
Manages frames for error-free data transfer point-to-point; CRC integrity checking
D
Data link layer sublayers
MAC; LLC
U
Network layer
enables internetworking; unique addressing for every node, determines routes; unreliable for
ST
error detection and correction; packets(reliable)/datagrams); routable (IP) and routing protocols
Transport layer
host-to-host integrity of transmission; detect damaged or lost packets; messages/segments
,Presentation layer
managing data presentation; encryption; character conversion
Application layer
interface between user applications and network's services via APIs; HTTP; SSH
What layer has "true adjacency"
only physical layer can communicate directly with partner layer
K
Logical adjacency
C
1:1 correlation between layers between hosts
LO
Encapsulation
higher level layers get wrapped by header and trailer of lower level layers then gets sent to
other host
YC
Bandwidth
Theortical max
Throughput
Actual/realistic amount
D
Analog bandwidth
U
Fmax-Fmin
ST
What is the bandwidth of a digital signal
Infinite
Serial
one bit at a time; long distances
parallel
multiple bits at a time; short distances; EMI and degradation
, Synchronous
time based with no gap between data items; timing maintained regardless of presence of data
Isochronous
times based but has fixed gap between data items
Asynchronous
K
Signal based (start/stop bits); sync must be re-established every communication cycle
C
what is an example of Serial & synchronous
USB, Firewire
LO
what is an example of Serial & Asynchronous
"terminal" applications, keyboard, console, mice
YC
what is an example of Parallel & Synchronous
PCIe
what is an example of Parallel & Asynchronous
Not much
D
Simplex
U
Unidirectional and cannot change direction
ST
Half-duplex
Unidirectional but can change directions (walkie-talkies)
Full-duplex
Bidirection concurrent communication
Auto-negotiation
auto set link speed and duplex mode
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