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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
Q. Show the Character-level Encryption? - Substitutional - Monoalphabetic - simplest form; also called Caesar cipher - Every character is replaced with another character
Q. What is Transmission Media? - Actually situated below the physical layer - Directly controlled through the physical layer - Data should be converted into electromagnet
1. A computer system has a two-level memory cache hierarchy. The L1 cache has a zero hit penalty, a miss penalty of 5 ns and a hit rate of 95 percent. The L2 cache has a miss pena
Q. How to connect Remote LANs? - Remote bridges acting as connecting devices to connect LANs and point-to-point networks such as leased telephone lines or ADSL lines
Ans) the two commands are:- show ver show flash
Cross Bar : The crossbar network is simplest interconnection network. It has a double dimensional grid of switches. It's a Non-blocking network and offers connectivity between out
How does a Token-Passing Protocol works? The token-passing protocol relies on a control signal known as the token. A token is a 24-bit packet that circulates throughout the net
What are the benefits of using subneting?
Can you define the difference among trusted and untrusted networks?
Physical Configurations Transport signal multiplexer de multiplexer. It either signal from multiple sources into a STS singles or de multiplexes and STS signal into diffe
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