Mike Meyer's Guide to Network+ Chapter 9

Hypertext Transfer Protocol (HTTP)

Extremely fast protocol used for network file transfers on the World Wide Web.

POP3

If you cannot receive e-mail, which of the following protocols should you suspect is not working properly? A) POP3 B) SMTP C) SNMP D) HTTP

e-mail client

Program that runs on a computer and enables a user to send, receive, and organize e-mail.

Internet Control Message Protocol (ICMP)

A TCP/ IP protocol used to handle many low-level functions such as error reporting.

Socket

A combination of a port number and an IP address that uniquely identifies a connection.

Telnet

A program that enables users on the Internet to log onto remote systems from their own host systems.

Secure Socket Layer (SSL)

A protocol developed by Netscape for transmitting private documents over the Internet.

Trivial File Transfer Protocol (TFTP)

A protocol that transfers files between servers and clients. Unlike FTP, TFTP requires no user login.

Transport Layer Security (TLS)

A robust update to SSL that works with almost any TCP application.

File Transfer Protocol (FTP)

A set of rules that allows two computers to talk to one another as a file transfer is carried out.

Listening port

A socket that is prepared to respond to any IP packets destined for that socket's port number.

Connection

A term used to refer to communication between two computers.

Secure Shell (SSH)

A terminal emulation program that looks exactly like Telnet but encrypts the data.

TCP three-way handshake

A three-packet conversation between TCP hosts to establish and start a data transfer session.

Connectionless

A type of communication characterized by sending packets that are not acknowledged by the destination host.

netstat

A universal command-line utility used to examine the TCP/IP connections open on a given host.

True

A variety of TCP/IP protocols work below the Application layer of the OSI model to provide support to the many applications we use on a TCP/IP network. True or False?

Unsecure protocol

Also known as an insecure protocol, transfers data between hosts in an unencrypted, clear text format.

Internet Message Access Protocol version 4 (IMAP4)

An alternative to POP3.

Apache HTTP Server

An open source HTTP server pro- gram that runs on a wide variety of operating systems.

Web services

Applications and processes that can be accessed over a network, rather than being accessed locally on the client machine.

Transport

At what layer of the OSI model does the set of protocols indicated by the TCP part of TCP/IP work? A) Data Link B) Transport C) Application D) Network

Endpoints

Correct term to use when discussing the data each computer stores about the connection between two computers' TCP/IP applications.

Ephemeral port number

In TCP/IP communication, an arbitrary number generated by a sending computer that the receiving computer uses as a destination address when sending a return packet.

Endpoint

In the TCP/IP world, the session information stored in RAM. See also Socket.

FTP = 20 and 21(D) HTTP = 80 (A) Telnet = 23 (C) SMTP = 25 (B)

Match the port number to the protocol used. FTP, HTTP, Telnet, and SMTP A) 80 B) 25 C) 23 D) 20 and 21

Electronic email (email)

Messages, usually text, sent from one person to another via computer.

Web client

Microsoft Internet Explorer and Mozilla Firefox are examples of this type of TCP/IP application. A) mail client B) Web client C) Web server D) FTP client

Internet Information Services (IIS)

Microsoft's Web server program for managing Web servers.

False

Most TCP/IP applications use TCP as the Transport layer protocol because it is a connectionless protocol designed to check for errors. True or False?

TCP

Most computer connections use this Transport layer protocol. A) UDP B) ICMP C) TCP D) IGMP

Connection-oriented

Network communication between two hosts that includes negotiation between the hosts to establish a communication session.

Post Office Protocol version 3 (POP3)

One of the two protocols that receive e-mail from SMTP servers.

Dynamic port numbers

Port numbers 49152-65535, recommended by the IANA to be used as ephemeral port numbers.

Well-known port number

Port numbers from 0 to 1204 that are used primarily by client applications to talk to server applications in TCP/IP networks.

Registered port

Port numbers from 1024 to 49151.

Internet Group Management Protocol (IGMP)

Protocol that routers use to communicate with hosts to determine a "group" membership in order to determine which computers want to receive a multicast.

Hypertext Transfer Protocol over SSL (HTTPS)

Protocol to transfer hypertext from a Web server to a client in a secure and encrypted fashion.

Simple Mail Transfer Protocol (SMTP)

The main protocol used to send electronic mail on the Internet.

Private port, Dynamic port

This is a name used for ports in the 49152 to 65535 range. (Select all that apply.) A) well-known port B) private port C) dynamic port D) registered port

netstat

This is the "show me the endpoint" command. A) RSH B) RCP C) netstat D) rlogin

HTTP

This is the underlying protocol on the World Wide Web. A) HTML B) JavaScript C) IIS D) HTTP

IMAP4

This protocol is an alternative to POP3, with special enhancements. A) SMPT B) POP4 C) IMAP4 D) Web-based e-mail

Registered port

This type of port has a number in the 1024 to 49151 range. A) well-known port B) private port C) dynamic port D) registered port

Web browsing

What function is being used if a packet is sent to port 80? A) FTP B) Web browsing C) Telnet D) e-mail

Process ID (PID)

What is the name for the number used by the operating system to track all running programs? A) private port number B) socket C) process ID (PID) D) dynamic port number

Socket, Endpoint

What is the name for the session information stored in RAM by a computer on one side of a session? (Select all that apply.) A) connections B) session C) socket D) endpoint

ICMP

What is the protocol of choice for very simple applications that never need more than a single packet? A) TCP B) UDP C) ICMP D) IGMP

Open port, Listening port

What is the status for a socket that is prepared to respond to any IP packets destined for that socket's port number? (Select all that apply.) A) open port B) established port C) closed-wait D) listening port

Established port

What is the status of a port that is part of an active working endpoint pair? A) open port B) established port C) close-wait D) listening port

Well-known port numbers

What name is given to the port numbers in the range of 0 to 1023? A) private port numbers B) well-known port numbers C) dynamic port numbers D) listening ports

Telnet

What protocol, replaced in recent years by a more secure protocol, was for many years the primary protocol used to allow a user to log in remotely and execute text-based commands on a remote host? A) FTP B) Telnet C) HTTPS D) SMTP

ICMP

Which protocol does the ping application use? A) UDP B) ICMP C) HTTP D) DHCP

IGMP

Which protocol enables routers to communicate with hosts to determine a group membership for multicast communications? A) SNMP B) ICMP C) SMTP D) IGMP

TFTP

Which protocol, not appropriate for use over the Internet, is used for transferring files between servers and clients without requiring a user login? A) HTTP B) FTP C) TFTP D) SMTP