Exam 24: Electronic Mail, dns, and Http

________ is an Internet standard defined in RFC 1939 that supports the basic functions of download and delete for e-mail retrieval.

Defined in RFC 821,______ is the standard protocol for transferring mail between hosts in the TCP/IP suite.

A ________ is a server that appears to the client as if it were an origin server.

The _______ domain is dedicated exclusively for private businesses.

A _______ is a forwarding agent,receiving a request for a URL object, modifying the request,and forwarding the request toward the server identified in the URL.

The IP address provides a way of uniquely identifying devices attached to the Internet.

The header section is not always present in a DNS message.

The ________ works on behalf of user actors and user applications and is their representative within the e-mail service.

_______ are server programs that hold information about a portion of the domain name tree structure and the associated RRs.

Domains are organized hierarchically.

The ________ is like a packet switch or IP router in that its job is to make routing assessments and to move the message closer to the recipients.

The ________ accepts each arriving message and either places it in the appropriate user mailbox or copies it to the local outgoing mail queue if forwarding is required.

IMAP always keeps messages on the server and replicates copies to the clients.

The Internet mail architecture is currently defined in RFC _______ .

An MUA can employ a long-term message store.

The _______ accepts the message submitted by an MUA and enforces the policies of the hosting domain and the requirements of Internet standards.

________ supplements SMTP and allows the encapsulation of multimedia (nontext)messages inside of a standard SMTP message.

__________ is a facility that allows users at workstations and terminals to compose and exchange messages.

DNS is based on a hierarchical database containing _________ that include the name,IP address,and other information about hosts.

The ________ relays mail for one application-level hop.