Tài liệu giảng dạy CCNA - module 7-2 NETWORK SERVICE & NETWORK ADMINISTRATION

1 NETWORK SERVICE & NETWORK ADMINISTRATION 2 Table of Content 1 Workstations and Servers 2 Network Management 3 WORKSTATIONS AND SERVERS 4 Workstations  D 5 Workstations  A workstation is a client computer that is used to run applications and is connected to a server from which it obtains data shared with other computers.  A server is a computer that runs a network operating system (NOS). A workstation uses special software, such as a network shell program to perform the following tasks:  Intercepts user data and application commands  Decides if the command is for the local operating system or for the NOS.  Directs the command to the local operating system or to the network interface card (NIC) for processing and transmission onto the network  Delivers transmissions from the network to the application running on the workstation  Common to classify computers and operating systems based on the types of applications the computer runs. 6 Servers 7 Servers (cont.)  Server systems must be equipped to support multiple concurrent users and multiple tasks .  Servers usually have high-capacity, high-speed disk drives, large amounts of RAM, high-speed NICs, and in some cases, multiple CPUs.  These servers are typically configured to use the TCP/IP, and offer one or more TCP/IP services.  Servers running NOSs are also used to authenticate users and provide access to shared resources.  By centralizing user accounts, security, and access control, server-based networks simplify the work of network administration. 8 Servers (cont.)  Redundancy is the inclusion of additional hardware components that can take over if other components fail and can be repaired without interruption while the systems are up and running.  Server applications and functions include HTTP, FTP, and DNS.  Standard e-mail protocols supported by network servers include SMTP, POP3, and IMAP.  File sharing protocols include Sun Microsystems NFS and Microsoft SMB. 9 Servers (cont.)  Network servers frequently provide print services.  A server may also provide DHCP.  A servers can be set to act as a basic firewall for the network. This is accomplished using proxy or Network Address Translation (NAT).  Most organizations must deploy several servers in order to achieve acceptable performance. 1 0 Servers (cont.) WEB1 WEB2 WEB3 WEB4 QC server PDC/DNS 100 Mbps Switch 100 Mbps Switch Database server1 Database server2 100 Mbps Switch Admin. RAS Monitoring server Firewall [...]... Concept of service on servers  NOSs are designed to provide network processes to clients Network services include:  World Wide Web (WWW)  File sharing (NFS, SMB)  File transfer (FTP)  E-mail (POP3, SMTP, IMAP)  Directory services (DNS, LDAP)  Print services (LPD)  Remote management (Telnet, SNMP)  Dynamic IP allocation  Firewall (NAT) NETWORK MANAGEMENT Introduction to network management Network. .. continues even as vendors develop and release state-of-the-art SNMP-based management applications SNMP Components SNMP: Management station  Usually a standalone workstation, it includes a collection of software called the network management application (NMA) and user interface  It responds to user commands and issued commands to management agents throughout the network  The NMS performs a monitoring function... computers were designed for easy networking in a peer-to-peer, workgroup situation  NIC are included as part of the hardware  Networking components are built into the Macintosh operating system  Macs can be connected to one another in workgroups and can access AppleShare file servers Macs can also be connected to PC LANs that include Microsoft, NetWare, or UNIX servers Apple - Mac OS X (10)  The Macintosh... environment, additional specialized software enables the local user to access non-local or remote resources Introduction to NOS  Network operating system (NOS) enables communication between multiple devices and the sharing of resources across a network  A NOS operates on UNIX, Microsoft Windows NT, or Windows 2000 network servers  A system capable of operating as a NOS server must be able to support... run powerful network servers, not desktop computers UNIX, Sun, HP (cont.)  Today, there are dozens of different versions of UNIX, including the following:  Hewlett Packard UNIX (HP-UX)  Berkeley Software Design, Inc (BSD UNIX), which has produced derivatives such as FreeBSD  Santa Cruz Operation (SCO) UNIX  Sun Solaris  IBM UNIX (AIX)  Sun Solaris is a high-performance, versatile, 64-bit implementation... Monitoring network availability Improved automation Monitoring response time Security features Traffic rerouting Restoration capability User registration What is driving Network Management?  Controlling corporate assets – If network resources are not effectively controlled, they will not provide the results that management requires  Controlling complexity – With massive growth in the number of network. .. Controlling complexity – With massive growth in the number of network components, users, interfaces, protocols, and vendors, loss of control of the network and its resources threatens management  Improved service – Users expect the same or improved service as the network grows and the resources become more distributed  Balancing various needs – Users must be provided with various applications at a given... reasonable cost Some basic network management terms OSI and network management model SNMP and CMIP standards  Two main standards have emerged: SNMP operation  SNMP is an application layer protocol designed to facilitate the exchange of management information between network devices  Today, SNMP is the most popular protocol for managing diverse commercial, university, and research internetworks  Standardization... LINUX (cont.)  Recent distributions of Linux have networking components built in for connecting to a LAN, establishing a dialup connection to the Internet, or other remote network In fact, TCP/IP is integrated into the Linux kernel  Some advantages of Linux as a desktop operating system and network client include the following:  It is a true 32-bit operating system  It supports preemptive multitasking...Client-server relationship Information request Response Service request Response Remote client Local host Server Remote host Client Introduction to OS  A computer operating system (OS) is the software foundation on which computer applications and services run on a workstation  Common functions of an OS on a workstation include . 1 NETWORK SERVICE & NETWORK ADMINISTRATION 2 Table of Content 1 Workstations and Servers 2 Network Management 3 WORKSTATIONS AND SERVERS 4 Workstations  D 5 Workstations. the local operating system or to the network interface card (NIC) for processing and transmission onto the network  Delivers transmissions from the network to the application running on. concurrent users and multiple tasks .  Servers usually have high-capacity, high-speed disk drives, large amounts of RAM, high-speed NICs, and in some cases, multiple CPUs.  These servers