Network Management Question Bank

1. What is a directory service?
2. What is the function of DNS?
3. Write full form of: ISDN, RARP, DHCP, and LDAP.
4. What is active directory service?
5. What is scheme in directory service?

Satellite Link Budget

A link budget is accounting of all of the gains and losses from the transmitter, through the medium (free space, cable, waveguide, fiber, etc.) to the receiver in a telecommunication system. It accounts for the attenuation of the transmitted signal due to propagation, as well as the antenna gains, feedline and miscellaneous losses. Randomly varying channel gains such as fading are taken into account by adding some margin depending on the anticipated severity of its effects. The amount of margin required can be reduced by the use of mitigating techniques such as antenna diversity or frequency hopping.

Matlab Code for Satellite Link Budget

clear all;

clc;

disp('ENTER UPLINK PARAMETERS')

disp('---------------------------------------')

pt=input('Earth station Transmitter output power :');

lbo=input('Earth Station back-off loss : ');

lbf=input('Earth station branching and feeder losses :');

at=input('Earth station Transmit antenna gain : ');

lu=input('Additional uplink atmospheric losses : ');

lp=input('Free-space path loss : ');

gte=input('Satellite receiver G/Te ratio : ');

bfb=input('Satellite branching and feeder losses : ');

br=input('Bit rate : ');

disp('---------------------------------------')

disp('ENTER DOWNLINK PARAMETERS')

disp('---------------------------------------')

disp('')

How to Make Bootable USB/ Disk

  The following steps guide you on how to make the USB drive bootable and get the contents onto the drive.

1. Insert the USB drive.
2. Open a CMD prompt using the Run as Administrator option.
3. Start the DISKPART tool by typing Diskpart and press ENTER.
4. List all disks recognized by the system by typing  list disk and pressing ENTER.

Matlab code for Traffic Measurement

Matlab Code for Traffic measurement

% Define the erlang function

function B = erlangb(N, A)

if (length(N)~=1) | (fix(N) ~= N) | (N < 0)

  error('N must be a scalar positive integer');

end

% TODO: test that elements of A are real and positive here?

esum = zeros(size(A));

for ii=0:N

    esum = esum + A .^ ii ./ factorial(ii);

end

B = A .^ N ./ (factorial(N) .* esum);