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802.11 FHSS
Frequency-hopping spread spectrum in a 2.4 GHz band
Carrier sends on one frequency for short duration then hops to another frequency for same duration, hops again to another for same amount of time and so on
Spreading adds security since only sender and receiver agree on sequence of allocated bands
Contention is handled by MAC sub layer since all stations use the same sub bands
Pseudorandom number generator chooses the hopping sequence
Data rate is of 1 or 2 Mbps
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.
THICK ETHERNET WIRING: It needs thick coax cable. AUI cable joins from NIC to transceiver. AUI cable take digital signal from NIC to transceiver. The transceiver creates anal
What is the difference between routable and non- routable protocols? Ans) Routable protocols can work with a router and can be used to build huge networks. Non-Routable protocol
FCS= Frame Check Sequence CRC (Cyclic Redundancy Check) algorithm runs in switch that known as FCS (Frame Check Sequence)
INTRODUCTION In this part, the topic of performance evaluation shows those parameters that are devised to calculate the performances of various parallel systems. Achieving the
DNS Message There are the only two kinds of DNS message DNS query and reply messages. Further mote both query and reply message have the same format as shown in figure.
Q. What are the Tools sued for Cryptography and Web Security? Tools - Cryptography VPN - remote access PGP - email Dedicated Circuits -tunnels' - IPSec
Control Frame: claim_token Consider first station turned on Station notices no tokens Sends claim_token No competitors, so makes a ring of just itself P
Monitor Stations Lost tokens - timer is issued each time a frame or token is generated If no frame is received in time period new token is generated by a monitor stat
Distributed Shared Memory (DSM) systems copy a shared memory abstraction on loosely coupled architectures in order to allow shared memory programming despite missing hardware suppo
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