Exercise $1$: Study the timing diagrams for the Go$-$back$-$N and Selective Repeat Sliding Window protocols from the annotated notes $($Module $4-$Part $4).$

a$)$ For Go$-$back$-$N$,$

$-$ draw a timing diagram to show the case where an ACK is delayed

$-$ draw a timing diagram to show the case where both a data segment and an ACK are delayed within the same window.

a$)$ For Selective Repeat,

$-$ draw a timing diagram to show the case where an ACK is delayed

$-$ draw a timing diagram to show the case where both a data segment and an ACK are delayed within the same window.