What do you mean by peptide bond?
Peptide linkage is an amide formed between -COOH group and -NH2 group. The reaction of between two molecules of similar or different amino acids, proceeds through the combination of the amino group of one molecule with the carboxyl group of the other. This results in the elimination of a water molecule and formation of a peptide bond -CO-NH-.
In the dipeptide Glycylalanine( Gly-ala), which amino acid has a free amino group and which has a free carboxyl group?