Hello Anita,
ISIS has different types of IIH
LAn:
LAN Level-1 hello 10 seconds 30 seconds
LAN Level-2 hello 10 seconds 30 seconds
serial
a single type of serial IIH 10 seconds 30 seconds
useful commands are:
show clns nei det
show clns int
IS-IS hasn't all the OSPF network types.
Hope to help
Giuseppe