NCRT 120, System Networking- Chapter 7-13 Exam with Complete Solutions

SNA is a ______ network architecture. - ANSWER-hierarchical SNA pre-defines most resources (i.e. applications and hardware) in order to - ANSWER-provide constant flow of data and prevent congestion. TCPIP is responsible for Layer 3 (TCP) of the OSA, but VTAM is responsible for the Input/Output control of the OSA - ANSWER-True Match the SNA configuration data format and the location - ANSWER-A. SNA configuration information in human readable form B. SNA configuration-dependent load modules in machine readable form 1. VTAMLIST 2.VTAMLIB Answer: 1:A, 2:B All sessions in an SNA subarea network are established with the use of an SSCP. - ANSWER-True Match the SNA Physical Unit (PU) with the type of computing hardware that implements that function - ANSWER-A. PC B. Communication Controller C. Control Unit D. Mainframe 1. PU5 2. PU4 3. PU2 4. PU2.1 Answer Key: 1:D, 2:B, 3:C, 4:A TCP/IP uses only headers. SNA uses only trailers. - ANSWER-False; TCP/IP does not use trailers, but network layer protocols used by TCP/IP could Match the SNA terms - ANSWER-A. A logical connection between subarea nodes that has a transmission priority. B. The physical connection between subarea nodes. C. A logical connection between a peripheral node that has its own local addressing and a subarea node that can route SNA traffic. D. One or more physical links, viewed as a single composite connection, for routing between subarea nodes. 1. Explicit Route 2. Transmission Group 3. Virtual Route 4. Route Extension Answer Key: 1:B, 2:D, 3:A, 4:C Match the SNA Logical Unit (LU) type with the function. - ANSWER-A. Transaction programs that communicate in a client/server mode with multiple sessions. B. Applications and advanced graphical workstations that communicate using the 3270 datastream, often with some device independence due to complex processing. C. Application programs and workstation displays that use the 3270 datastream. D. Applications that communicate using SNA, but have a private datastream. 1. LU2 2. LU6.2 3. LU0 4. LU4 Answer Key: 1:C, 2:A, 3:D, 4:B A Path Information Unit (PIU) in SNA is roughly equivalent to an IP packet, that is, at the same layer in their stacks. - ANSWER-True: A PIU is the protocol format used in the SNA Path Control layer, the equivalent of which in TCP/IP is the Internet layer, where IP packets are the format. SNA binds between the two communicating LUs, but APPN must bind between multiple nodes, boundary functions, and LUs. - ANSWER-True An SNA "bind" function only specifies parameters used at the Data Link layer. - ANSWER-False: The bind actually specifies parameters used in the presentation layer, the data flow control layer, and the transmission layer A "Bind" sets up a connection between two end points, ensuring they both accept the same connection parameters. - ANSWER-True If an LU accepts a Bind request from another LU, it must ______. - ANSWER-accept all the session parameters, respond with acceptable modifications to the session parameters, or reject the session The TN3270 data stream does not support a graphical user interface. - ANSWER-True: TN3270 is character-based only. The logon screen you see when you first connect to z/OS through TN3270 can contain variable values, dynamically determined, such as your LU name. - ANSWER-True: TN3270 initially shows you the USS message 10, which can contain several variables such as date, time, and LUname. If you are using a TN3270 client on your PC, where is the definition of the Logon screen you see? - ANSWER-The USS entry in VTAMLST TN3270 is a gateway program that transfers data between a TCP/IP socket connection to an SNA LU-LU connection. - ANSWER-True A real 3270 datastream can inhibit input (i.e. prevent typing) in certain areas of the screen, but TN3270 emulators cannot prohibit that. - ANSWER-False: A TN3270 client emulates a 3270 and will prohibit input in the same locations as a real 3270. What are LU maps used for? - ANSWER-LU maps specify which IP addresses are allowed to create LUs to connect to specific applications. Branch Exchangers allow APPN to scale because they hide a private APPN network behind their End Node image. - ANSWER-True What is not a function of APPN Inter-session routing? - ANSWER-Network address translation Which is not an implementation stage of SNA? - ANSWER-NCP SNAsw is a logical progression after DLSw when migrating SNA to IP. - ANSWER-True SNA dynamically determines routing and path selection between LUs using a database of all known network nodes. - ANSWER-False: APPN, not SNA, uses dynamic routing. SNA uses static routing (even if it has a choice of routes, they are all pre-defined). APPN network nodes maintain a topology database. - ANSWER-True In APPN, this type of session is roughly equivalent to the "Client/Server" model of TCP/IP. - ANSWER-DLUR/DLUS (Dependent LU Requester / Dependent LU Server) If you have a DLSw router at the data center, you don't require one at the branch location. - ANSWER-False: You need a matching pair at both locations Both SNA and TCP/IP can change the pace of the network traffic in an established connection, but SNA pace is controlled by adapting to network congestion and TCP/IP pace is controlled by the applications' ability to accept more data in buffers. - ANSWER-False: The opposite is true Every Communication Controller that runs NCP is referred to as a "domain". - ANSWER-False: An instance of VTAM is a domain, not an NCP The TSO netstat command and the console operators "D TCPIP,,NETSTAT" command perform the same function. - ANSWER-True These four parameters are required for starting VTAM: - ANSWER-SSCPID, SSCPNAME, NETID, HOSTSA Which type of APPN node does not have the ability to make a CP-to-CP connection? - ANSWER-LEN APPN locate requests cause "broadcast storms" that limit its scalability. - ANSWER-True In regards to System z channels, QDIO stands for - ANSWER-Queued Direct Input Output High Performance Routing takes advantage of the higher reliability of intermediate network nodes by bypassing many SNA error handling functions. - ANSWER-True SNAsw uses HPR and Static VIPA at the host to bypass communication controllers. - ANSWER-True Which ulility command should you use to determine if TCP/IP has been initialized on your z/OS system? - ANSWER-netstat up The only way to verify that TCP/IP is using the parameters you specified in PARMLIB or TCPPARMS is if you write your own utility program. - ANSWER-False Which is not a feature of APPN? - ANSWER-Scalability HTML is used for controlling the structure and layout of a webpage - ANSWER-True Match the System z operator interface with the system scope - ANSWER-A. Single system only B. One or more systems 1. Service Element 2. Hardware Management Console Answer Key: 1:A, 2:B What network function can not be implemented with a communication controller? - ANSWER-Network Node (NN) If a component along the route used by a communication path fails, in which 3 network architectures is the session re-routed dynamically (as opposed to failing and not recovering)? - ANSWER-TCP/IP HPR APPN (Only SNA does the session fail and not re-routed) When using Enterprise Extender, a UDP message is used to encapsulate the SNA HPR message. - ANSWER-True The operator's MODIFY console command is used to control whether a VTAM resource is ACTive or INACTive. - ANSWER-False This is a common tool used by hackers to examine network traffic - ANSWER-Packet Sniffer A sysplex is a group of "tightly coupled" processors, by definition. - ANSWER-False The Simple Network Management Protocol (SNMP) is only available on IBM systems - ANSWER-False SNA - ANSWER-- Systems network Architecture is a data communication established by IBM - Different implementations of SNA can occur from product to product - Recognize and recover from loss of data during transmission What member in VTAMLST specifies which major nodes will be activated during VTAM startup? - ANSWER-ATCSTRxx determines which major nodes will be activated during VTAM startup How does VTAM determine the complete member name to use to start major nodes at VTAM startup? - ANSWER-The suffix specified for the STR= option, either in the command that started VTAM or the main configuration member. HTTPS does not use encryption - ANSWER-False This component of High Performance Routing performs end-point recovery and enables non-disruptive path switching. - ANSWER-RTP (Rapid Transport Protocol) This component of High Performance Routing is not aware of sessions and also performs no error handling. - ANSWER-RTP (Rapid Transport Protocol) Select 3 connection types that are unique to System z - ANSWER-Coupling facility links, hipersocket links, and samehost links