Before you begin the topic about networking on z/OS

Introduction to networking on the mainframe

• Mainframes and networks
• Mainframes, networks, and you
• Networks and online systems
• Why are networks important?
• Examples of mainframe-based networks
• Technology choices abound in network technology
• Who supports the network?
• What are the basic elements of a network?
• Overview of mainframe network capabilities
• z/OS Communications Server
• SNA and TCP/IP on z/OS
• Security in a network
• Data protection in a mainframe network
• Availability of a mainframe network
• Network layers and protocols review
• Networking terminology
• Network layers
• Physical media, layer 1
• Network interface card (NIC)
• Data link layer, layer 2
• Ethernet
• Media access control (MAC) addressing
• Network layer, layer 3
• Address Resolution Protocol (ARP)
• Network types
• Virtual LAN
• Network routing
• Routing tables and protocols
• Internet Control Message Protocol (ICMP) and other layer 3 protocols
• Transport layer, layer 4
• Transmission Control Protocol (TCP)
• User Datagram Protocol (UDP)
• Sockets
• Network applications
• Network security
• Systems Network Architecture (SNA)
• Hardware connectivity on the mainframe
• Channel subsystem (CSS)
• The mainframe channel subsystem and network links
• Hardware channels
• Channel command word (CCW) channels
• Parallel channel
• Enterprise System Connectivity (ESCON) channel
• Fiber connection (FICON)
• Channel-attached network devices
• Coupling channels
• Open Systems Adapter (OSA)
• Queued Direct I/O (QDIO)
• Non-QDIO mode
• OSC mode
• Open Systems Adapter for NCP (OSN)
• HiperSockets
• The I/O cage
• Sample network configuration
• Requirements for a mainframe network
• Example: the ZOS Company data center
• Key mainframe network availability aspects
• Hardware availability
• Software availability

TCP/IP implementation on the mainframe

• TCP/IP on z/OS
• The TCP/IP daemon
• The TCP/IP profile
• TCP/IP Profile statements
• Link configuration
• IP configuration
• TCP configuration
• Static routing information
• Automated IP application monitoring
• Generic servers and multiple TCP/IP instances
• The FTP server
• The telnet daemon
• A good resolver is hard to find
• How an application searches for resolver configuration information
• Resolver address space
• Type of application (MVS or z/OS UNIX)
• The search order for resolver configuration information
• The multi-stack environment
• TCP/IP clients
• TCP/IP in a sysplex
• Computer cluster
• The z/OS sysplex
• Cross-system Coupling Facility (XCF)
• Workload Manager (WLM)
• Dynamic virtual addressing
• Unique application-instance DVIPA
• Multiple application-instance DVIPA
• Dynamic cross-system coupling
• Sysplex distributor
• Sysplex distributor roles
• TCP/IP definitions for sysplex distributor
• An example of distributed connections
• Controlling distribution of work in a network
• How work can be distributed to the network
• Problem detection and recovery in the cluster
• The routing function in a sysplex
• Network interface card

SNA and SNA/IP implementation on the mainframe

• Systems Network Architecture - basics and implementation
• What is Systems Network Architecture (SNA)?
• The evolution of SNA
• Subarea networking
• SNA nodes
• System services control point (SSCP)
• Subareas and domains
• Connecting subarea nodes
• Architectural components of the SNA network
• Path information unit (PIU)
• How LU-LU sessions are initiated
• Class of service (CoS)
• VTAM subarea definitions
• VTAM start options
• VTAM configuration lists
• How VTAM resources are defined
• Sift-down effect
• Sample VTAM network
• SNA Advanced Peer-to-Peer Networking (APPN)
• Introduction to APPN
• Advanced Program-to Program Communications (APPC)
• Advanced Peer-to-Peer Networking (APPN)
• APPC versus APPN
• APPN node types
• Low-entry networking (LEN) nodes
• End nodes (EN)
• Network nodes (NN)
• Specialized network node types
• Specialized VTAM Nodes
• Control point (CP-CP) sessions
• APPN databases
• Topology database (TOPO DB)
• Directory services database (DS DB)
• APPN network topology
• Topology data update (TDU) flows
• How directory services locate resources in APPN
• Broadcast search
• Directed search
• How a CDS minimizes broadcast searches
• Route calculation in APPN
• Transmission group (TG) characteristics
• Class of service (CoS)
• High performance routing (HPR)
• Rapid transport protocol (RTP)
• Automatic network routing (ANR)
• HPR headers
• Path switching
• Connection networks
• Dependent LU requester/server (DLUR/DLUS)
• Defining a VTAM APPN network
• SNA/IP implementation
• Background on SNA/IP implementation
• DLSw and Logical Link Control 2 (LLC2)
• How an LLC2 connection is established over a LAN
• Data link switching (DLSw)
• How SDLC devices are connected using DLSw
• DLSw configuration
• Enterprise Extender
• Why does Enterprise Extender use UDP packets?
• Enterprise Extender on z/OS
• Class of service (CoS) and type of service (ToS)
• EE implementation in non-z/OS remote sites
• Internet connectivity exploitation and Enterprise Extender
• A comparison of Enterprise Extender and DLSw
• Enterprise Extender implementation
• SNA/IP configuration examples
• Enterprise Extender configuration
• Extended border node configuration
• Cisco SNASw definitions
• TN3270 Enhanced
• Introduction to the 3270 terminal
• 3270 data stream
• TN3270 Enhanced (TN3270E)
• Telnet protocol and SNA meet
• TN3270E description
• Additional TN3270E functions supported in z/OS
• Where to place a TN3270E server
• TN3270E server implementation
• TELNETPARMS statement block
• BEGINVTAM statement block
• VTAM setup for TN3270E server

Network operations and administration

• Network operational tasks
• Network startup
• VTAM startup
• TCP/IP startup
• How the network is stopped
• z/OS network administrator tasks
• Examples of managing VTAM
• Examples of managing TCP/IP
• Examples of controlling TCP/IP applications
• Network environment documentation
• Network security
• About security
• TCP/IP security
• Industry standard network security features
• Application layer security
• Transport Layer Security (TLS)
• Virtual Private Network
• Application Transparent TLS
• OpenSSH
• TCP/IP on z/OS security features
• Intrusion Detection Services (IDS)
• The System Authorization Facility (SAF) in a network context
• More port control
• IP filtering
• More network security options
• TN3270 security
• SNA security
• Network problem determination
• Determining the network problem
• Network tools and diagnostic aids
• Common (z/OS-wide) tools and diagnostic aids
• VTAM tools and diagnostic aids
• TCP/IP tools and diagnostic aids
• Tracing TCP/IP components
• Diagnostic TCP/IP commands
• VTAM problem determination
• TCP/IP problem determination
• Communications Storage Manager (CSM)
• Debugging CSM
• Commands used to monitor CSM
• Network performance and tuning