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Q. Explain physical layer of Osi reference model?
- The physical layer deals among the physical characteristics of the transmission medium.
- It defines the mechanical, electrical, procedural and functional specifications for maintaining, activating and deactivating the physical link between end systems.
- Such characteristics like timing of voltage changes, voltage levels, physical data rates, maximum transmission distances, physical connectors and other similar attributes are defined by physical layer specifications.
- Instances RJ45, EIA/TIA-232 and NRZ
Describe the term - stateful implies The term stateful implies that the firewall is wakeful and is capable of remembering the state of each session of packet exchange across it
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Some multiple WAN methods are defined below: ARPANET: It start in 1960's. It was operated by Advanced Research Project Agency, which is a company of US defense department.
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