70-284 notes 3

• Automatic Recovery can be enabled for the DNS client, DHCP server, and Error reporting services. No other services support automatic recovery
  

  
   

• Most of the exchange-related information is stored in AD. Exchange 2003 servers frequently query the global catalog service to obtain information about recipients and address lists. Recipient Update Service is the exchange component that generates address lists; it also maintains and updates information about user's email addresses.
  
• MSExchangeAL is a service that logs events related to the RUS.
  
• MSExchangeDSAccess is a service that provides exchange with access to AD. A large number of errors generated by these two services is most likely an indication that the exchange servers experience problems when they access AD
  

  
   

• A contact is an AD class that is specifically intended to provide placeholder objects that can be assigned appropriate contact information. They cannot be assigned permissions
  

  
   

• Address lists cannot be used to send the same message to multiple contacts. It is used to easily locate contacts.
  

  
   

• Standard POP3 uses TCP port 110. Secure POP3 (POP3 SSL) uses TCP port 995
  
• IMAP4 uses TCP port 143. IMAP4 SSL uses TCP port 993
  
• SMTP uses TCP port 25
  

  
   

• Perquisites for removing the first exchange 2003 server
  
  • Be at least exchange full administrator for the administrative group to which the server belongs
    
  • You must remove all mailboxes
    
  • Configure RUS to use another server. It is automatically installed on the first exchange server
    
  • Create an instance of Site Replication Service (SRS) on another server, and remove SRS from the server. SRS is installed on the first exchange 2003 computer that is installed into an exchange 5.5 site
    
  • If the server is the only bridgehead server for any connectors, then another exchange server must be designated as a bridgehead for those connectors and the server being removed must be removed from the connectors
    
  • By default, the first exchange server 2003 computer is designated as the routing group master. You must designate another server as a Routing group master before you can remove the server
    

    
     

• The following components must be enabled before installing exchange server 2003:
  
  • .net framework (if not installed, will be installed during exchange installation)
    
  • ASP .NET v1.1 or later (if not installed, will be installed during exchange installation)
    
  • IIS 5.0 or later (must include the world wide web publishing service, the SMTP service, and the NNTP service)
    

    
     

• To use encrypted email, users must be provided with digital encryption certificates. Each certificate is associated with a pair of keys (public and private). The private key is stored in a secure place. The public key is stored together with the certificate in a publically accessible location.    
  
• Sending an encrypted messages involve the following steps:
  
  • A secret encryption key is generated on the senders computer
    
  • That key is used to encrypt the contents of a message
    
  • To decrypt the message the recipient must have the secret key that was used to decrypt the message
    
  • Therefore, the secret key must be securely sent to the recipient.
    
  • Using the recipients public key, your email client encrypts the secret key in order to protect it
    
  • The encrypted secret key is sent to the recipient with the encrypted message
    
  • The recipient uses his or her private key to decrypt the encrypted secret key and then uses the secret key to decrypt the message
    

If a sender does not have access to a recipients public key then the sender cannot encrypt the secret key and consequently cannot send the encrypted message to the recipient