NET 125 ch15

Which is a feature of IMAP? -It uploads email messages to a server. -It listens passively on port 110 for client requests. -It downloads a copy of email messages leaving the original on the server.

-It downloads a copy of email messages leaving the original on the server.

Which of the following DNS record types is used to resolve IPv6 addresses? A NS AAAA MX

AAAA

Which TCP/IP model layer is closest to the end user? network access transport application internet

Application

Which peer-to-peer application allows users to share pieces of many files with each other at the same time? Hybrid Gnutella BitTorrent

BitTorrent

True or false? A DNS server that receives a request for a name resolution that is not within its DNS zone will send a failure message to the requesting client. True False

False

True or false? DHCP clients send a DHCP request message to available DHCP servers. True False

False

True or false? HTTP is a secure protocol. True False

False

Which application layer protocol is used to provide file-sharing and print services to Microsoft applications? HTTP SMB SMTP DHCP

SMB

DNS - Domain Name System (or Service)

TCP, UDP client 53 Translates domain names, such as cisco.com, into IP addresses.

These three OSI layers define the same functions as the TCP/IP model application layer. application presentation session transport network data link

application presentation session

Application Layer

the layer that provides the interface between the applications used to communicate, and the underlying network over which messages are transmitted. Application layer protocols are used to exchange data between programs running on the source and destination hosts.

True or false? FTP data transfers take place from client to server (push) and from server to client (pull). True False

true

Why is DHCP for IPv4 preferred for use on large networks? -Large networks send more requests for domain to IP address resolution than do smaller networks. -Hosts on large networks require more IPv4 addressing configuration settings than do hosts on small networks. -DHCP uses a reliable transport layer protocol. -It is a more efficient way to manage IPv4 addresses than static address assignment is. -It prevents sharing of files that are copyrighted.

-It is a more efficient way to manage IPv4 addresses than static address assignment is.

Which statement is true about FTP? -FTP is a peer-to-peer application. -The client can choose if FTP is going to establish one or two connections with the server. -The client can download data from or upload data to the server. -FTP does not provide reliability during data transmission.

-The client can download data from or upload data to the server.

How many connections are required by FTP between client and server? 1 2 3 4

2

Which protocol uses encryption? HTTPS DNS DHCP FTP

HTTPS

Which of the following DNS resource record types resolves authoritative name servers? NS A MX AAAA

NS

DHCP - Dynamic Host Configuration Protocol

UDP client 68, server 67 Dynamically assigns IP addresses to be re-used when no longer needed

BOOTP - Bootstrap Protocol

UDP client 68, server 67 Enables a diskless workstation to discover its own IP address, the IP address of a BOOTP server on the network, and a file to be loaded into memory to boot the machine BOOTP is being superseded by DHCP

TFTP - Trivial File Transfer Protocol

UDP client 69 A simple, connectionless file transfer protocol with best-effort, unacknowledged file delivery It uses less overhead than FTP

This is a function of the OSI session layer. compress and decompress data provide an interface between applications format data for the application layer exchange of information to initiate dialog between peers

exchange of information to initiate dialog between peers

True or false? Resource sharing over SMB is only supported on Microsoft operating systems. True False

false

Which two tasks can be performed by a local DNS server? (Choose two.) mapping name-to-IP addresses for internal hosts allowing data transfer between two network devices forwarding name resolution requests between servers retrieving email messages providing IP addresses to local hosts

mapping name-to-IP addresses for internal hosts forwarding name resolution requests between servers

MKV, GIF, and JPG standards are associated with which OSI layer? application presentation session transport

presentation

Which of the following is a feature of the Gnutella protocol? -Users can share whole files with other users. -Users can share pieces of files with other users. -Users can access an index server to get the location of resources shared by other users.

-Users can share whole files with other users.

What are two characteristics of the application layer of the TCP/IP model? (Choose two.) -responsibility for logical addressing -responsibility for physical addressing -closest to the end user -the creation and maintenance of dialogue between source and destination applications

-closest to the end user -the creation and maintenance of dialogue between source and destination applications

Which of the following is displayed by the nslookup utility? -the configured default DNS server -the IP address of the end device -all cached DNS entries

-the configured default DNS server

What part of the URL, http://www.cisco.com/index.html, represents the top-level DNS domain? http .com www index

.com

An author is uploading one chapter document from a personal computer to a file server of a book publisher. What role is the personal computer assuming in this network model? server client slave master transient

CLIENT

This layer of the OSI model is concerned with the protocols that exchange data between programs running on hosts. application transport network physical

application

True or false? The peer-to-peer networking model requires the implementation of a dedicated server for data access. True False

false

A wireless host needs to request an IPv4 address. What protocol would be used to process the request? FTP DHCP ICMP SNMP HTTP

DHCP

Which two are protocols that belong in the OSI application layer? PNG DNS SMTP QuickTime

DNS SMTP

Which three protocols or standards are used at the application layer of the TCP/IP model? (Choose three.) UDP IP GIF TCP HTTP MPEG

GIF HTTP MPEG

Which protocol can be used to transfer messages from an email server to an email client? HTTP SMTP SNMP POP3

POP3

This message type is used when uploading data files to a web server. GET POST PUT

POST

This protocol is used by a client to send email to a mail server. POP SMTP IMAP HTTP

SMTP

What is an SMB and what are it's function of the SMB messages?

SMB) is a client/server file sharing protocol that describes the structure of shared network resources, such as directories, files, printers, and serial ports. It is a request-response protocol. All SMB messages share a common format. This format uses a fixed-sized header, followed by a variable-sized parameter and data component. -start, authenticate and terminate sessions -control file and printer access -allow an application to send or receive messages to or from another device

HTTPS - HTTP Secure

TCP, UDP 443 The browser uses encryption to secure HTTP communications Authenticates the website to which you are connecting your browser

Presentation Layer

The presentation layer has three primary functions: Formatting, or presenting, data at the source device into a compatible format for receipt by the destination device. Compressing data in a way that can be decompressed by the destination device. Encrypting data for transmission and decrypting data upon receipt.

What message type is used by an HTTP client to request data from a web server? PUT ACK POST GET

GET

This protocol is used by a web browser to establish a connection to a web server. HTTP SSL IMAP SMTP

HTTP

POP3 - Post Office Protocol

TCP 110 Enables clients to retrieve email from a mail server Downloads the email to the local mail application of the client

True or false? In a peer-to-peer network environment every peer can function as both a client and a server. True False

True

Which of these ports are used by FTP? (Choose two.) 20 21 25 110

20 21

Session Layer

As the name implies, functions at the session layer create and maintain dialogs between source and destination applications. The session layer handles the exchange of information to initiate dialogs, keep them active, and to restart sessions that are disrupted or idle for a long period of time.

When retrieving email messages, which protocol allows for easy, centralized storage and backup of emails that would be desirable for a small- to medium-sized business? POP SMTP HTTPS IMAP

I

SMTP - Simple Mail Transfer Protocol

TCP 25 Enables clients to send email to a mail server Enables servers to send email to other servers

HTTP - Hypertext Transfer Protocol

TCP 80, 8080 A set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the World Wide Web

On a home network, which device is most likely to provide dynamic IPv4 addressing to clients on the home network? a dedicated file server a home router a DNS server an ISP DHCP server

a home router

IMAP - Internet Message Access Protocol

TCP 143 Enables clients to access email stored on a mail server Maintains email on the server

FTP - File Transfer Protocol

TCP 20 to 21 Sets rules that enable a user on one host to access and transfer files to and from another host over a network FTP is a reliable, connection-oriented, and acknowledged file delivery protocol