ch. 14-15 questions

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

.com

What is the complete range of TCP and UDP well-known ports?

0 to 1023

Assume a host with IP address 10.1.1.10 wants to request web services from a server at 10.1.1.254. Which of the following would display the correct socket pair?

10.1.1.10:1099, 10.1.1.254:80

Which number or set of numbers represents a socket?

192.168.1.1:80

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

2

Which of these ports are used by FTP? (Choose two.

20, 21

Which UDP header statement is true?

4 fields and 8 bit header

Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices? (Choose two.)

ACK and SYN

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

Application

These three OSI layers define the same functions as the TCP/IP model application layer.

Application, presentation, session

What type of applications are best suited for using UDP?

Applications that are sensitive to delay

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

Which two are protocols that belong in the OSI application layer?

DNS SMTP

How does a networked server manage requests from multiple clients for different services?

Each request has a combination of source and destination port numbers, coming from a unique IP address.

This is a function of the OSI session layer.

Exchange of information to initiate dialog between peers

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

F

Which two applications would use the TCP transport layer protocol? (Choose two.)

FTP and HTTP

Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead? (Choose two)

FTP. VOIP. DNS

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.

False

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

False

True or false? HTTP is a secure protocol.

False

Which protocol uses encryption?

HTTPS

Which TCP header statement is true?

It consists of 10 fields in a 20 byte header

Which is a feature of IMAP?

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 address assignment is.

Why is UDP desirable for protocols that make a simple request and reply transactions?

Low Overhead

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

MPEG GIF HTTP

Which of the following DNS resource record types resolves authoritative name servers?

NS

Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state?

Netstat

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

POSt

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

Presentation

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

SMB

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

SMTP

Which control bit flags are used during the three-way handshake?

SYN and ACK

What field is used by the destination host to reassemble segments into the original order?

Sequence Number

What TCP mechanism is used to enhance performance by allowing a device to continuously send a steady stream of segments as long as the device is also receiving necessary acknowledgements?

Sliding Window

Which of the following would be valid source and destination ports for a host connecting to an email server?

Source: 49152, Destination: 25

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

T

Which transport layer protocol ensures reliable same-order delivery?

TCP

What happens if part of an FTP message is not delivered to the destination?

The part of the FTP message that was lost is re-sent.

What happens when a sending host senses there is congestion?

The sending host reduces the number of bytes it sends before receiving an acknowledgment from the destination host.

Which layer is responsible for establishing a temporary communication session between the source and destination host applications?

Transport Layer

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

True

Which of the following is a stateless best-effort delivery transport layer protocol?

UDP

Which transport layer protocol statement is true?

UDP is a best-effort delivery protocol

Which UDP datagram reassembly statement is true?

UDP reassembles the data in the order that it was received

Which of the following is a feature of the Gnutella protocol?

Users can share whole files with other users

Which port group includes port numbers for FTP, HTTP, and TFTP applications?

Well known ports

What field is used to provide flow control?

Window Size

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

application

Which three are transport layer responsibilities? (Choose three.)

conversation multiplexing segmenting data and reassembling segments tracking individual conversations

Which two fields are the same in a TCP and UDP header? (Choose two.)

destination and support port number

Which two tasks can be performed by a local DNS server? (Choose two.)

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?

home router

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

pop3

Which two operations are provided by TCP but not by UDP? (Choose two.)

retransmitting any unacknowledged data acknowledging received data

Which of the following would be valid source and destination ports for a host connecting to a DNS server?

source - 45912 dest - 53

Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

the client randomly selects a source port number

What is a socket?

the combination of a source IP address and port number or a destination IP address and port number

What is a responsibility of transport layer protocols?

tracking individual conversations

Which transport layer protocol would be used for VoIP applications?

user datagram protocol (UDP)

Which of the following DNS record types is used to resolve IPv6 addresses?

AAAA

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

False

How many exchanges are needed to end both sessions between two hosts?

Four

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

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 two applications would use the UDP transport layer protocol? (Choose two.)

TFTP and VOIP

Which statement is true about FTP?

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

Network congestion has resulted in the source learning of the loss of TCP segments that were sent to the destination. What is one way that the TCP protocol addresses this?

The source decreases the amount of data that it transmits before it receives an acknowledgement from the destination.

What are two characteristics of the application layer of the TCP/IP model? (Choose two.)

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

What is the purpose of using a source port number in a TCP communication?

to keep track of multiple conversations between devices

Which transport layer feature is used to establish a connection-oriented session?

TCP Three way handshake