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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

46. By default, you can start recovery console using,

  1. The Windows 2000 Professional Setup Disks
  2. From the CD ROM drive using Windows 2000 Professional CD (if the CD –ROM drive is bootable).

Also, you can have “Recovery Console” as a start up option by typing  \i386\winnt32.exe /cmdcons at the command prompt, after switching to the CD ROM drive letter.

47. Recovery Console allows you to:

-          Start and stop services, format drives, read and write data on a local drive (including drives formatted to use NTFS). The Recovery Console is very useful if you need to repair your system by copying a file from a floppy disk or CD-ROM to your hard drive, or if you need to reconfigure a service that is preventing your computer from starting properly. You must be an administrator to use the Recovery Console.

 

48. TCP/IP protocol stack is installed by default when you install Windows 2000 on a computer.

49. The Advantages of VPN are:

  1. VPN allows corporations to reduce costs for long distance call using RAS and over long distance phone lines
  2. Because the ISP supports complex communications hardware configurations, a network administrator at the Corporation’s office is free to centrally manage user accounts at the remote access server.
  3. Because the most common network protocols (including TCP/IP, IPX , and NetBEUI) are supported, you can remotely run any application dependent upon these particular network protocols.
  4. IP Address Security: Because the VPN is encrypted, the addresses you specify are protected, and the Internet only sees the external IP address.
  5. Enhanced Security: The connection over the Internet is encrypted and secure.

 

50. IIS:

-          To install Internet Information Services:

                                                              i.      Click Start, point to Settings, click Control Panel and start the Add/Remove Programs application.

                                                             ii.      Select Add/Remove Windows Components and then follow the on-screen instructions to install, remove, or add components to IIS.