$1.$ What is the network layer supposed to deal with?

$2.$ Given a two$-$level hierarchy with five regions $($see the following figure$)$ :

$($a$)$Draw a full table for $5$B

$($b$)$Draw a hierarchical table for $5$B

$3.$ Convert the IP address whose hexadecimal representation is C$22$F$1582$ to dotted decimal notation.