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Packet Switching Networks Packet Switching - Packets are relayed across network along the best route available.
Repeater = Physical layer - takes a weak signal and regenerates it - doesn't translate or filter anything - can move packets from on physical media to another (i.e. can connect thinet to fiber-optic) - they are cheap - will pass a broadcast storm
Bridge = Data Link layer - does everything a repeater does - reduce traffic by segmenting the network by using a routing table- regenerate the signal at the packet level - not suited to WANs slower than 56K - will pass broadcast storms - read the source and destination of every packet - pass packet with unknown destinations - connect dissimilar networks (i.e. Token Ring and Ethernet)
Router = Network layer - does filtering and isolating traffic - forwards particular protocols to particular addresses (other routers) - connect network segments - not all protocols are routeable (LAT and NetBEUI) - are used in complex network situations because they provide better traffic mgmt. than brides - don't pass broadcast traffic.
Brouter = combines best qualities of both a bridge and a Router - can act like a Router for one protocol and bridge all of the others (nonroutable) - delivers more cost-effective
 

 
 

 

 

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MCSE : Security Specialist

Implement, configure, and manage, local user authentication.

Authentication

Successful user authentication in a Windows 2000 computing environment consists of two separate processes: interactive logon, which confirms the user's identification to either a domain account or a local computer, and network authentication, which confirms the user's identification to any network service that the user attempts to access.

Some types of authentication that Windows 2000 supports are:

 

  • Kerberos V5 is used with either a password or a smart card for interactive logon. It is also the default method of network authentication for services.The Kerberos V5 protocol verifies both the identity of the user and network services.
  • Secure Socket Layer/Transport Layer Security (SSL/TLS) authentication, is used when a user attempts to access a secure Web server.

 Implement, configure, and manage, a security configuration.

Security settings include Security Policies (account and local policies), access control (services, files, registry), event log, group membership (restricted groups), Internet Protocol security Security policies, and Public Key policies.

Security templates are a physical representation of a security configuration: a file where a group of security settings may be stored. Windows 2000 includes a set of security templates, each based on the role of a computer: from security settings for low security domain clients to highly secure domain controllers. These templates can be used as provided, modified, or serve as a basis for creating custom security templates.

Security configuration tools To define and use security templates, administrators use the Security Templates snap-in. To configure and analyze security locally, administrators use the Security Configuration and Analysis snap-in. To configure security centrally in Active Directory, administrators use the Group Policy snap-in.