Module 15 - Application Layer

Which two tasks can be performed by a local DNS server? - Forwarding name resolution requests between servers - Providing IP addresses to local hosts - Allowing data transfer between two network devices - Retrieving email messages - Mapping name-to-IP addresses for internal hosts

- Forwarding name resolution requests between servers - Mapping name-to-IP addresses for internal hosts

On a home network, which device is most likely to provide dynamic IPv4 addressing to clients on the home network?

A home router

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

AAAA

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

Application

This is a function of the OSI session layer:

Exchange of information to initiate dialog between peers

[T or F] 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.

False

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

SMB

How many connections are required by FTP between client and server?

2

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

NS

Which of these ports are used by FTP? - 20 - 21 - 25 - 110

- 20 - 21

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

What are two characteristics of the application layer of the TCP/IP model? - Closest to the end user - The creation and maintenance of dialogue between source and destination applications - Responsibility for physical addressing - Responsibility for logical addressing

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

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

- DNS - SMTP

Which three protocols or standars are used at the application layer of the TCP/IP model? - GIF - HTTP - TCP - IP - MPEG - UDP

- GIF - HTTP - MPEG

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

.com

Which TCP/IP model layer is the closest to the end user?

Application

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

BitTorrent

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?

Client

A wireless host needs to request an IPv4 address. What protocol would be used to process the request?

DHCP

[T or F] HTTP is a secure protocol.

False

[T or F] Resource sharing over SMB is only supported on Microsoft operating systems.

False

[T or F] The peer-to-peer networking model requires the implementation of a dedicated server for data access.

False

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

GET

This protocol is used by a web browser to establish a connection to a web server.

HTTP

Which protocol uses encryption?

HTTPS

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?

IMAP

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.

Why is DHCP for IPv4 preferred for use on large networks?

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

Which protocol can be used to transfer messages from an email server to an email client?

POP3

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

POST

MKV, GIF, and JPG standards are associated with with OSI layer?

Presentation

This protocol is used by a client to send email to a mail server.

SMTP

Which statement is true about FTP? - FTP does not provide reliability during data transmission. - FTP is a peer-to-peer application. - The client can download data from or upload data to the server. - 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.

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

[T or F] FTP data transfers take place from client to server (push) and from server to client (pull).

True

[T or F] In a peer-to-peer network environment, every peer can function as both a client and a server.

True

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.