Chapter 17, Configuring the Time Synchronization Protocol (TSP)
If submasters are excluded, there is normally only one master time daemon running on a given LAN. During an election, only one of the slave time daemons becomes the new master. Not all hosts are suitable as masters, however. Because a master time daemon requires CPU resources proportional to the number of slaves it controls, you should consider running a master only on hosts with more powerful processors or lighter processing loads. Also, hosts with inaccurate clocks should not be used as masters. Note that this is a purely administrative decision. You are free to allow all of the hosts on your network to be a master.
At startup time, a time daemon running on a host connected to
multiple networks may be instructed to recognize specific networks
with the -n option
or to ignore specific networks with the -i option.
Note that both options cannot be specified together.
In other words,
you can recognize certain networks or ignore certain networks,
but you cannot do both.
Typically, you would instruct the time daemon to ignore all networks
except those that are under local administrative control.
If you run timed on several different LANs connected over gateways, you should avoid the situation where two gateways are both connected to the same two networks, and where the time daemons on those gateways play opposite master/slave roles on those networks. For example, suppose hosts A and B are gateways that are both connected to networks X and Y. If timed is started on both A and B with the -M option, it is possible for the time daemon on gateway A to become a slave on network X and the master on network Y, while the time daemon on gateway B can become a slave on network Y and the master on network X. If this kind of loop exists, the master time daemons do not function properly to establish a single value for time on both of the networks. It also causes the submasters to use large amounts of system resources in the form of network bandwidth and CPU time. This kind of loop can also be generated with more than two gateways, in the case where several LANs are interconnected. |
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Additional Administrative Tasks
Address Resolution Protocol (ARP)
Addressing at the Data Link Layer
Advantages of Packet Switching
Assigning File-Level Permissions on an NTFS Partition
Asynchronous Transfer Mode (ATM)
Band Usage (Baseband or Broadband)
Characteristics of Transmission Media
Coax and Fire Code Classifications
Communications Devices and OSI
Comparing Contention and Token Passing
Configuring Network Adapter Cards
Connection-oriented and Connectionless Modes
Creating and Assigning Permissions to a Shared Folder on Windows NT
Defining a Network Adapter Card
Error and Flow Control at the Data Link Layer
Establishing Troubleshooting Connectivity and Communication
Exercise 1.1: Logging on as a Peer
Exercise 1.2: Windows NT Access Permissions
Exercise 1.3: Exploring the NT Workstation Service
Exercise 10.1: Network Adapter Resource Settings
Exercise 10.2: Windows NT Diagnostics
Exercise 11.1: Mapping a Network Drive
Exercise 12.1: Using Network Monitor
Exercise 12.2: Creating a Chart in Performance Monitor
Exercise 12.3: Performance Monitor Alerts, Logs, and Reports
Exercise 13.1: Modem Troubleshooter
Exercise 13.2: Windows NT Books Online
Exercise 2.1: Gateway Services for NetWare
Exercise 2.2: SLIP and PPP in Dial-Up Networking
Exercise 3.1: Shopping for Network Cabling
Exercise 4.1: Matching Topologies to Applications
Exercise 5.1: Installing Network Protocols in Windows NT
Exercise 5.2: Network Bindings
Exercise 6.1: Enabling IPX Routing
Exercise 7.1: Accessing an X.25 Network Through NT Dial-Up Networking
Exercise 8.1: Creating a User Account in Windows NT
Exercise 8.2: Creating Groups on Windows NT
Exercise 8.3: Sharing a Directory on a Windows NT FAT Partition
Exercise 8.4: Setting NTFS Permissions on a Shared Folder
Exercise 8.5: Sharing a Directory Using Share-Level Security
Exercise 8.6: Sharing a Directory Using User-Level Security
Exercise 8.7: Creating a Local Printer with Windows NT
Exercise 8.8: Sharing a Printer on the Network with Windows 95
Exercise 9.1: Exploring Windows NTs Disk Administrator
Extended LANs (Wireless Bridging)
Finding Resources on Microsoft Networks
Frequency-Division Multiplexing
Handling Other Network Problems
Hardware Access at the Data Link Layer
IEEE 802.3 and IEEE 802.5 Media
Implementing a Fault-Tolerant Design
Implementing Security on Windows 95
Implementing Security on Windows NT
Initiating the Troubleshooting Process
Installing Network Adapter Cards
Internet Control Message Protocol (ICMP)
Managing and Securing a Microsoft Network
Managing User Accounts and Groups Using Windows NT
Narrow-Band Radio Transmission
Network Models: Comparing Server-Based and Peer-to-Peer Configurations
Network Topologies and Architectures
Networking Concepts and Components
Open Shortest Path First (OSPF)
OSI Application Layer Concepts
OSI Presentation Layer Concepts
Physical and Logical Topologies
Printer Sharing with Windows 95
Printer Sharing with Windows NT
Recovering from System Failure
Remote Terminal Emulation (TELNET)
Routing Information Protocol (RIP)
Rules and the Communication Process
Security for Printer Resources
Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP)
Session Layer Session Administration
Share-Level Security on Windows 95
Shielded Twisted-Pair (STP) Cable
Simple Mail Transfer Protocol (SMTP)
Spread-Spectrum Radio Transmission
Standards Organizations and the ISO
Summary of Cable Characteristics
Transmission Control Protocol (TCP)
Transport Layer Connection Services
Troubleshooting Cables and Connectors
Troubleshooting Hubs and MSAUs
Troubleshooting Network Adapter Cards
Troubleshooting Network Performance
Unshielded Twisted-Pair (UTP) Cable
User-Level Security on Windows 95
Virtual Circuit Packet Switching
Wireless Communications with LANs
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