chapter. If you are already comfortable with the topics in this chapter, this summary could help
you recall a few details. If you have just read this chapter, this review should help solidify some
key facts. If you are doing your final preparation before the exam, these tables are a convenient
way to review the day before the exam.
generally provide upper-level network services.
architecture. APPN handles session establishment between peer nodes, dynamic
transparent route calculation, and traffic prioritization for APPC traffic.
speed communication between programs on different computers in a distributed computing
environment. APPC establishes and tears down connections between communicating
programs. It consists of two interfaces: a programming interface and a data-exchange
interface. The former replies to requests from programs requiring communication; the latter
establishes sessions between programs. APPC runs on LU 6.2 devices.
controller
data link. In SNA, a programmable device that controls the input/output operations of
attached devices. Typically, an IBM 3174 or 3274 device.
networked device. In SNA, typically an IBM 3745 device.
communicate with each other and gain access to SNA network resources.
network. PU 2.1 sessions do not require that one node reside on VTAM. APPN is based on PU
2.1 nodes, which can also be connected to a traditional hierarchical SNA network.
sessions with other LUs.
between a router and a Token Ring host. If the parameters of the serial device contained in
the XID packet do not match the host's configuration, the session is dropped.