NetWare (2)
IPX - Internetwork Packet Exchange:
- connectionless, datagram-based
- unique address: consists of network number (32 bits) and node number (48bits MAC address)
- support for four encapsualtion schemes:
- Novell Ethernet 802.3
- Novell_Ethernet_802.2
- Ethernet version II
- Ethernet_SNAP
- SAP - Service Advertisement Protocol
- services like file servers and print servers advertise their services they provide
- advertisements are sent every 60 sec
- services are identified by numbers (4=file server; 7=print server)
- in NetWare 4.x SAP is replaced by NDS (NetWare Directory Services)
SPX - Sequenced Packet Exchange :
- reliable, connection oriented protocol
- derived from XNS Sequenced Packet Protocol