Define the function of IGMP? Define the term subneting? Define the information element Type of ISDN? Define the mobility? Define the term BSS? Explain various types of signaling point and links in SS7? Explain IP Addressing and various classes of IPv4? Explain the ATM reference model? Write short notes on protocol stack signal system 7? Explain the various layer of ISDN? Explain the various elements of the wireless network? And also write down the difference between wired link and wireless link? Explain the different part of PSTN? Describe function grouping and element of function grouping? Describe the function of ARP and RARP with packet format? Describe the format of IP Datagram? Explain DIAS Network