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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
1. Bob has been given the task of changing the IP address and enabling telnet access on a CISCO 2950 enterprise switch. The current IP address is 10.10.10.2/8 the new IP address
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Q. Show the Model for Network Access Security? Model for Network Access Security (1) Gatekeeper functions comprise Password-based login authentications. (2)
DNS ID hacking The Dns use ID system in order to keep track of each every request and replies. In order to spoof the DNS’s response, the hacker needs to do ID Hacking. In orde
Application Layer The application layer is where network applications and their application layer protocols reside. The internet application layer includes many protocols
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Butterfly permutation This permutation is getting by interchanging the important significant bit in address with smallest significant bit.
What is the purpose of cables being shielded and having twisted pairs? The main purpose of this is to stop crosstalk. Crosstalks are electromagnetic interferences or noise that
Q. Unshielded Twisted Pair - transmission media? - A most common kind suitable for both voice and data transmission - Categories are determined by chain quality - Cat 3 c
Which protocol will send a message to routers if a network outage or congestion happen Ans) Internet Control Message Protocol - ICMP will send a message to routers if a network
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