Frame relay is a simplified version of __________.
A.
DSL
B.
X.25
C.
ISDN
D.
SDLC
Explanation:
Frame relay is very similar to X.25, but it has removed the error
checking that was done on the network. Frame relay handles this task at the end
node, which helps to improve speed dramatically.
Frame relay began as a stripped-down version of the X.25 protocol, releasing itself from the error-correcting burden most commonly associated with X.25. When frame relay detects an error, it simply drops the offending packet. Frame relay uses the concept of shared access and relies on a technique referred to as “best-effort”, whereby error-correction practically does not exist and practically no guarantee of reliable data delivery occurs. Frame relay provides an industry-standard encapsulation, utilizing the strengths of high-speed, packet-switched technology able to service multiple virtual circuits and protocols between connected devices, such as two routers.
Although frame relay became very popular in North America, it was never that popular in Europe. X.25 remained the primary standard until the wide availability of IP made packet switching almost obsolete. It was used sometimes as backbone for other services, such as X.25 or IP traffic. Where FR was used in the USA also as carrier for TCP/IP traffic in Europe backbones for IP networks often used ATM or PoS, later replaced by Carrier Ethernet[2]
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I agree with the answer. B
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