Computer Networking

RS-232

It can be seen that the external clock pulses (pulses to be counted) are fed directly to each J-K flip-flop in the counter chain and that both the J and K inputs are all tied together in toggle mode, but only in the first flip-flop, flip-flop A (LSB) are they connected HIGH, logic "1" allowing the flip-flop to toggle on every clock pulse. Then the synchronous counter follows a predetermined sequence of states in response to the common clock signal, advancing one state for each pulse.

The J and K inputs of flip-flop B are connected to the output "Q" of flip-flop A, but the J and K inputs of flip-flops C and D are driven from AND gates which are also supplied with signals from the input and output of the previous stage. If we enable each J-K flip-flop to toggle based on whether or not all preceding flip-flop outputs (Q) are "HIGH" we can obtain the same counting sequence as with the asynchronous circuit but without the ripple effect, since each flip-flop in this circuit will be clocked at exactly the same time. As there is no propagation delay in synchronous counters because all the counter stages are triggered in parallel the maximum operating frequency of this type of counter is much higher than that of a similar asynchronous counter.

Type your answer here...

#include<stdio.h>

#include<conio.h>

void main()

{

char sender[50],receiver[50];

int i,winsize;

clrscr();

printf("\n ENTER THE WINDOWS SIZE : ");

scanf("%d",&winsize);

printf("\n SENDER WINDOW IS EXPANDED TO STORE MESSAGE OR WINDOW \n");

printf("\n ENTER THE DATA TO BE SENT: ");

fflush(stdin);

gets(sender);

for(i=0;i<winsize;i++)

receiver[i]=sender[i];

receiver[i]=NULL;

printf("\n MESSAGE SEND BY THE SENDER:\n");

puts(sender);

printf("\n WINDOW SIZE OF RECEIVER IS EXPANDED\n");

printf("\n ACKNOWLEDGEMENT FROM RECEIVER \n");

for(i=0;i<winsize;i++);

printf("\n ACK:%d",i);

printf("\n MESSAGE RECEIVED BY RECEIVER IS : ");

puts(receiver);

printf("\n WINDOW SIZE OF RECEIVER IS SHRINKED \n");

getch();

}

HOTELS

The straight-backed posture, the sensible walking shoes, the plain dress with its high collar and sleeves straight to the wrist, the narrow-lensed glasses perched at the end of the nose, the lack of jewelry and make-up, and the hair pulled tightly back into a no-nonsense bun all combined to give the young schoolteacher a severe, almost forbidding look to her normally rambunctious students.

Ping command

for example "Ping 127.0.0.1"

Which is the loop back address

The Layer 3(Network Layer) is associated with IP addressing.Because,It converts the frames into packets and address them to send across the other network through intermediary devices.While transferring across the other network's have to know about the destination IP address and also source IP address's deals with IP address.

it has no common sense ;P

No, the modem and codec are not exactly the functional inverse of each other.

teh modem converts the digital data to analog signal by teh modulating part of it.

teh demodulating part of the modem can be used to covert teh ANALOG SIGNAL to digital data....but this analog signal will be modulated analog signal.

the coding part of teh codec convert teh analog signals to teh digital signal .these analog signals are pure analog signals.

Hence teh codec and modem may seem as functional inverses but do not work as so due to teh fact dat the demodulating part of the modem used only the modulated analog signal and cannot process the pure analog signals .

Caching only DNS servers is a computer that either has MS Windows Sever 2000, 2003 or 2008 operating system installed on it. Then it has a DNS server role installed on it (think of it as a plug-in program like ad-blocker for Firefox). And instead of having a DNS zone (sort of like a shard network folder that only other severs which have been giving permission to access the folder can have a copy of it, and inside are the names address of all the other computers like the white pages) configured into it, it instead remembers where everyone has been so that it takes less time for the next time someone else wants to go to the same place. only problem is that the computer can never shutdown. Think of it like a word document in progress that can be changed and read but the save button is missing so in the event of a power faller all information will be lost. However it doesn't need to be managed like DNS zone.

session setup, maintenance, and tear down. checkpoint controls

Multiplexing

Capture filter or a pre-filter

an output power which is one - quarter of the input power

if an address conflict is detected, the address is removed from the pool for an amount of time configurable by the administrator.

rite

If you are given a graph of the signal. Calculate the period, T, which length of time for one cycle.

The frequency is f = 1/T (Hz)

For example. T = 20 ms, f = 1/(20 ms) = 50 Hz.

If you are given an equation, in the form of:

v(t) = Vm cos (ωt + ϴ)

The frequency is ω (rad/s)

For example v(t) = 120 V cos ((314 rad / s) t + 0)

The frequency is 314 rad/s = 50 Hz.

electronic form or e-form

It inform devices about the type of information it should expect

Semantics: Meaning of each section of bits. How is a particular pattern to be interpreted, and what action is to be taken based on that interpretation? For example, does an address identify the route to be taken or the final destination of the message? It includes control information for coordination and error handling.

It's called a Heat Sink.

packet switching can be considered an improvement over message switching.Similar to message switching,packet switching forwards data on first come first serve basis between nodes and no dedication connection is made (as it is done in circuit switching). But unlike message switching,packet switching puts an upper limit on the maximum size of the packet.If the packet size is greater than the maximum,it is segmented and then transmitted.Each segment has separate header which increases the overhead. But it reduces the average delays.Also in case of packet switching data is not stored for later transmission to a currently busy or inactive terminal.It just takes care of data transmission between nodes