CNIT 342 Exam I Questions & Answers Correct 100%

Root servers should only be consulted when a DNS server doesn t know the address of a DNS server that is authoritative for the domain in question. True/False? - Answer T PTR records should only be found in ________________ name resolution zones. - Answer Reverse DNS zones and domains are synonymous. True/False? - Answer F You must provide three DNS servers that are available 24/7 to register a second level domain name. True/False? - Answer F Best practice is to use your Internet DNS domain for your Active Directory. True/False? - Answer F When setting up e-mail architectures you should incorporate a relay host (forwarder) in the DMZ for outgoing mail. True/False? - Answer T The main reason for spam is an lack of authentication in SMTP. True/False? - Answer T POP3 provides a means of _______________ mail from a loosely connected client. - Answer Retrieving IMAP is a means of ______________ mail on a server from a client. - Answer accessing A spam control filtering technique that learns based on what the user thinks is spam is typically termed a Bayesian Filter. True/False? - Answer T When using a relay host you should limit the hosts that it will service. True/False? - Answer T You must place an ACL on a mail forwarder to limit the hosts for whom it will deliver mail. Running an open relay will inevitably result in spammers routing mail through your forwarder and its rapid inclusion on SPAM blacklists. When setting up e-mail architectures you should incorporate a relay host (forwarder) in the DMZ for outgoing mail. True/False? - Answer T You should always use a mail forwarder to buffer your internal mail server from interacting with unauthenticated Internet hosts. A valid e-mail address contains a user name and a DNS entry. True/False? - Answer T The portion of an e-mail address after the @ sign must be resolvable via DNS to an IP address to which the SMTP session will be opened. The portion of the address before the @ sign must be a unique user for which that host is willing to deliver mail. The user can have an account on the server itself or the server can be configured to forward mail to another host for the user. Forwarding can be wildcarded for all users within a specific domain. SMTP is used to deliver mail between hosts. True/False? - Answer T Simple Mail Transfer Protocol All e-mail messages are sent via SMTP. SMTP only sends one copy of a message to a destination host regardless of how many users on the destination host are to receive the message.