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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
VPN Technology For an organization VPN technology uses some main techniques for privacy a.Encryption /Authentication b.Tunnelling c.Fire walls
Question : a) Explain why pervasive computing can be termed as a "technology that disappears". b) List and briefly explain four main components of a MOTE used in Wireless
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Q. What are the trends in Network Security ? Trends in Network Security Improved vigilance for virus infections Continual maturation of firewall technologies
Q. Host System in TCP-IP model? - Standards adopted because of widespread use like (Internet) - The protocols came first plus the model was really just a description of the
Can you define how L2F data tunneling process works?
What is the difference between TFTP and FTP application layer protocols? Ans) TFTP - Trivial File Transfer Protocol A stripped down version of FTP, easy to use and fast. TFTP
"arpa" is used by the Cisco IOS for which encapsulation types Ans) Ethernet_II
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