$5\mathrm{.}0.$ Consider the following arrangement of switches and destinations. Give forwarding tables $($in neighbor form$)$ for $S1-S4$thatincludedefault

forwarding entries; the default entries should point toward S$5.$ The default entries will thus automatically forward to the "possible other destinations"

shown below right.

Eliminate all table entries that are implied by the default entry $($that is$,$ if the default entry is to $S3,$ eliminate all other entries for which the next hop is

S$3).$