Network access or interface layer in TCP/IP Protocol

In the following series, which of the options will correctly fit into the gap

ZA5, Y4B, XC6, W3D, _____

If 7 * 5 @ 10 # 20 = 370 and 4 * 3 @ 5 # 30 = 90, then

2 * 3 @ 4 # 5 = ?

In a certain code language, 'BEST' is coded as '9715' and 'CLUB' is coded as '8762'.

What is the code for 'B' in the given code language?

Select the figure from among the given options that can replace the question mark (?) in the following series.

After interchanging the given two signs what will be the values of equation (I) and (II) respectively?

 × and ÷ 

Select the option that represents the correct order of the given words as they would appear in an English dictionary.

1. Diamond

What should come in place of the question mark (?) in the given series based on the English alphabetical order?

NRT, JNP, FJL, BFH, ?

Select the option figure which is embedded in the given figure (Rotation is NOT allowed).