1 votes 1 votes In case of network layer, which among the following is incorrect? A)ISO X.25 B)DNU C)IP D)X25 PLP Shubham Sharma 2 asked Mar 18, 2017 Shubham Sharma 2 734 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply srestha commented Mar 18, 2017 reply Follow Share IP is in network layer, TCP-IP protocol is a network layer protocol. ISO should also for internet protocol. So, ans should be in between b) and d) 0 votes 0 votes Devshree Dubey commented Mar 18, 2017 reply Follow Share X25 PLP expands to Packet Layer Protocol and a network layer protocol. :). It cud possibly b d). :) –1 votes –1 votes Please log in or register to add a comment.
Best answer 2 votes 2 votes Answer is B) DNU , which not use in network layer, DNU use in SDH-Sonet a) ISO X.25 use in network Layer - [1] c) IP - use in network Layer , it is Internet layer protocol [2] d) X25 PLP - use in network layer, it is the Network Layer protocol for the X.25 protocol suite. [3] References: [1] http://nptel.ac.in/courses/106105080/pdf/M4L4.pdf : page 6 [2] https://en.wikipedia.org/wiki/Internet_layer [3] https://en.wikipedia.org/wiki/Packet_Layer_Protocol Bikram answered Mar 20, 2017 • selected Mar 20, 2017 by Shubham Sharma 2 Bikram comment Share Follow See all 5 Comments See all 5 5 Comments reply Bikram commented Mar 20, 2017 reply Follow Share And Sonet is use in Physical layer [1] . [1] https://supportforums.cisco.com/discussion/11619531/sonet-what-osi-layer 0 votes 0 votes Shubham Sharma 2 commented Mar 20, 2017 reply Follow Share The ISO equivalent protocol to X.25, ISO 8208, is compatible with X.25, but additionally includes provision for two X.25 DTEs to be directly connected to each other with No Network in between. I think this mean that ISO X.25 will not work in network Layer Source:https://en.wikipedia.org/wiki/X.25. 0 votes 0 votes Shubham Sharma 2 commented Mar 20, 2017 reply Follow Share SONET can carry nearly any higher-level protocol (including IP), If sonet is carrying IP protocol then it will be working on Network Layer. https://www.lifewire.com/sonet-synchronous-optical-network-816475 0 votes 0 votes Bikram commented Mar 20, 2017 reply Follow Share No you thinking wrongly, read that Nptel pdf i provided in 6th page , your doubt will clear. 0 votes 0 votes Shubham Sharma 2 commented Mar 20, 2017 reply Follow Share Cleared.thanks for info provided. 0 votes 0 votes Please log in or register to add a comment.