NetWare and AppleTalk protocols

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$Math Mysteries - Measurement$

Unit 7::NetWare and Apple Talk Protocols AppleTalk Data Link Layer Protocols AppleTalk was originally designed to operate over Apple’s proprietary LAN protocol, LocalTalk, which was designed to allow workstations to be connected to Apple’s LaserWriter printer. The transmission speed of the LocalTalk cabling system is very low, only 230.4 Kbits/second. AppleTalk now supports Ethernet, token ring, and FDDI in addition to LocalTalk. AppleTalk’s data link layer protocols attempt, but do not guarantee, to provide error-free transmission of data frames from the physical layer interface (for example, LocalTalk or Ethernet) to the network layer. There are four data link protocols corresponding to specific physical layer interfaces. • LocalTalk Link Access Protocol (LLAP) • EtherTalk Link Access Protocol (ELAP) • TokenTalk Link Access Protocol (TLAP) • FDDITalk Link Access Protocol (FLAP) 322 ST0025804A Routing
Lesson 7-1:NetWare and Apple Talk Protocols AppleTalk Network Layer Protocols There are two protocols that rest in the network layer, AppleTalk Address- Resolution Protocol (AARP) and Datagram Delivery Protocol (DDP). • AARP—This protocol is AppleTalk’s version of the TCP/IP Address Resolution Protocol, ARP. It is the job of AARP to associate a node’s hardware address with its network address. When the protocol receives a packet transmission, it specifies the network address to which the packet will be sent. AARP learns the hardware addresses of the network nodes by issuing a request for information and receiving responses back from each network node. Each node maintains an address-mapping table that stores the associated hardware and network addresses. The node’s table is updated each time AARP resolves a network and hardware address association. • DDP—The Datagram Delivery Protocol is AppleTalk’s connectionless routing protocol. As with the data link layer protocols, there are no guarantees for error-free delivery of packets by DDP. It receives and transmits frames from the data link layer. DDP adds a header with the destination address and then sends the packet to the appropriate data link protocol. It also reads the DDP header on frames received from the data link layer and routes the packet to the appropriate socket. The DDP Packet Bits DDP Header 1 1 4 10 16 16 16 8 8 8 8 8 DATA Type Source Socket Destination Socket Source Address Destination Address Source Network Destination Network 0 0 Length Hop Count Checksum ST0025804A 323
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NetWare and AppleTalk protocols

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