Chapter 13 - Yellott.com

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Oct 27, 2013 (3 years and 7 months ago)

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Chapter Thirteen

The Other Protocols

Objectives


You’ll get a brief overview of


IPX/SPX


NetBEUI


Appletalk


How each protocol handles addressing


The pros and cons of each protocol

IPX/SPX


Internetwork Packet Exchange/Sequenced
Packet Exchange


Developed by Xerox in the early 80s


Adopted and tweaked by Novell to become their
protocol of choice in NetWare

Addressing in IPX/SPX


32
-
bit network address


MAC address of interface becomes host address


A socket number assigned to the process or
application running on the device


This is NOT the same as the sockets discussed in the
Transport layer.


The station address


The combined network/host address

Configuring IPX/SPX


If no network number is statically assigned, the
host will send out a broadcast looking for a SAP
server.


The SAP server will assign an address.


Correct frame type is necessary in IPX.


Auto Detect usually works pretty well.


Frame Types


802.3 (Raw)


The typical Ethernet frame


802.2


An older frame type used by non
-
Ethernet
protocols


Ethernet II


Ethernet SNAP

Routing in IPS/SPX


If a packet isn’t addressed to the local network,
the transmitting station will broadcast a RIP
packet.


Available routers with access to the target
network number respond with their node
address and the number of hops to target.


Transmitting workstation picks the router with
the fewest hops and transmits the packet.

Pros and Cons of IPS


Pros


Light overhead on the individual workstations


Very easy to configure and hard to mess up


Cons


Very HEAVY overhead on the network as a
whole


A limited number of hops prevents extremely
large networks (like the Internet)

NetBEUI


NetBIOS Enhanced User Interface


Developed by Microsoft for early versions of NT


A Layer 2 protocol


No longer supported by Microsoft


XP does not install NetBEUI by default, but the
protocol can be added from the installation CD.

Pros and Cons of NetBEUI


Pros


Easy to configure


All you need is to put all workstations on the same
workgroup, but make sure they have different names.


Extremely fast with low overhead on network
and workstations


Cons


Not routable

AppleTalk


Developed by Apple Computer Corporation


Has a lot of similarities to TCP/IP


Layered functionality


A robust collection of related protocols


Moves data in datagrams

Addressing in AppleTalk


Each host is assigned a node ID and an entity
name.


The Node ID is similar to the IP address.


The entity name is similar to a NetBIOS name.


Networks are numbered (like in IPX/SPX) with
16
-
bit network numbers.


The Name Binding Protocol (NBP) resolves
node IDs and entity names to MAC addresses.

Some AppleTalk Protocols
(1 of 2)


Datagram Delivery Protocol (DDP) provides point
-
to
-
point delivery of user data.


Routing Table Maintenance Protocol (RTMP) allows
routers to dynamically build routing tables.


AppleTalk Echo Protocol (AEP) is Apple’s version of
ICMP.


AppleTalk Transaction Protocol provides connection
-
oriented data delivery services.

Some AppleTalk Protocols
(2 of 2)


AppleTalk Data Streaming Protocol (ADSP)
provides jitter
-
free delivery of multimedia.


AppleTalk Session Protocol (ASP) opens,
maintains, and closes sessions.