1.          The five topologies used in wide area networks (WANs) are: point-to-point, multipoint, hierarchical, star, and ring.

2.          Point-to-point topology connects a console to a mainframe computer.

3.          A multipoint topology would be used.

4.          Hierarchical.

5.          Peer-to-peer.

6.          A network addressable unit (NAU) describes a node on an SNA network.

7.          SSCP — (domain)

        PU — (activate physical link)

        LU — (end user)

        CP — (peer PU)

8.          SSCP-SSCP

        SSCP-PU

        SSCP-LU

        LU-LU

        CP-CP

9.          Type 5 node — (host computer)

        Type 4 node — (controller)

        Type 2 node — (peripheral devices)

        Type 2.1 node — (peer-to-peer)

10.      Type 4 and 5 node types are SNA subarea nodes.

11.      The path control level in the SNA layered model corresponds to the network layer in the OSI model.

12.      The SNA model was expanded to seven layers to make SNA more compatible with established standards and to facilitate the interconnection of SNA with other networks.

13.      LU 6.2, program-to-program.

14.      System 370/390, IBM AS/400, and IBM PS/2 are platforms on which SAA can be used.

15.      PC-DOS and VSE are not supported by SAA.

16.      Common Communication Support (CCS) allows different hardware platforms to communicate.

17.      The physical layer (PU) is not defined in the SAA model; it deals only with software and not hardware.

18.      Phase IV is the current version of DNA.

19.      DDCMP, Ethernet, and X.25 are supported by DNA.

20.      The three types of software defined by the ANSI X.12 standard are application, network, and translation software.