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Q. Summary of osi model?
- There was no standard for networks in the early period and as a result it was difficult for networks to communicate with each other.
- The ISO (International Organisation for Standardisation) recognised this. And researched various network schemes in addition to in 1984 introduced the Open Systems Interconnection (OSI) reference model.
- The Open Systems Interconnection (OSI) reference model has standards which ensure vendors greater compatibility and interoperability between various types of network technologies.
- The Open Systems Interconnection (OSI) reference model organizes network functions into seven numbered layers.
- Every layer provides a service to the layer above it in the protocol specification and communicates with the same layer's software or hardware on other computers.
- Layers 1-4 are apprehensive with the flow of data from end to end through the network and Layers 5-7 are concerned with services to the applications.
how does the near/far effects infulence TDMA system?what happen CDMA system? what are countermeasures in TDMA system/
Control Frame: solicit_successor Periodically ask for any station to link by sending solicit_successor Token with sender's addr and successor's addr wait 2 (as in
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Dissimilar kinds of firewalls?
Explain the physical and logical paths in a computer communication network also
Q. Describe about Cryptography? - Some media cannot be protected from unauthorized reception (or interception) - Encryption involves transforming the original information in
What is the difference between a straight-through and crossover cable? A straight-through cable is used to connect computers to a hub, switch, or router. A crossover cable is u
State the congestion avoidance process Notifies the source that congestion avoidance process should be initiated where applicable for traffic in the opposite direction of the r
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Q. Show Nonreturn to Zero encoding? - Value of signal is for all time positive or negative - NRZ-L Signal level depends on bit represented; positive typically means 0
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