ITN | Modules 14

How are port numbers used in the TCP/IP encapsulation process?

Source port and destination port numbers are randomly generated.

If multiple conversations occur that are using the same service, the source port number is used to track the separate conversations.

Source port numbers and destination port numbers are not necessary when UDP is the transport layer protocol being used for the communication.

Destination port numbers are assigned automatically and cannot be changed.

Correct! Wrong!

What is a responsibility of transport layer protocols?

translating private IP addresses to public IP addresses

tracking individual conversations

providing network access

determining the best path to forward a packet

Correct! Wrong!

What are two characteristics of peer-to-peer networks? (Choose two.)

Please select 2 correct answers

centralized user accounts

one way data flow

decentralized resources

resource sharing without a dedicated server

scalability

Correct! Wrong!

What do the client/server and peer-to-peer network models have in common?

Both models support devices in server and client roles.

Both models are used only in the wired network environment.

Both models require the use of TCP/IP-based protocols.

Both models have dedicated servers.

Correct! Wrong!

Which layer in the TCP/IP model is used for formatting, compressing, and encrypting data?

session

network access

application

presentation

internetwork

Correct! Wrong!

What are two roles of the transport layer in data communication on a network? (Choose two.)

Please select 2 correct answers

identifying the proper application for each communication stream

tracking the individual communication between applications on the source and destination hosts

providing frame delimiting to identify bits making up a frame

providing the interface between applications and the underlying network over which messages are transmitted

performing a cyclic redundancy check on the frame for errors

Correct! Wrong!

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

The message is lost because FTP does not use a reliable delivery method.

The entire FTP message is re-sent.

The FTP source host sends a query to the destination host.

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

Correct! Wrong!

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

HTTP

POP3

SNMP

SMTP

Correct! Wrong!

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

0 to 1023

256 – 1023

1024 – 49151

0 to 255

Correct! Wrong!

Which three application layer protocols use TCP? (Choose three.)

Please select 3 correct answers

HTTP

FTP

TFTP

SMTP

DHCP

SNMP

Correct! Wrong!

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 window size to decrease the rate of transmission from the destination.

The destination decreases the window size.

The destination sends fewer acknowledgement messages in order to conserve bandwidth.

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

Correct! Wrong!

What kind of port must be requested from IANA in order to be used with a specific application?

registered port

private port

source port

dynamic port

Correct! Wrong!

Which transport layer feature is used to guarantee session establishment?

UDP ACK flag

TCP port number

UDP sequence number

TCP 3-way handshake

Correct! Wrong!

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

IMAP

HTTPS

Correct! Wrong!

Which three layers of the OSI model provide similar network services to those provided by the application layer of the TCP/IP model? (Choose three.)

Please select 3 correct answers

transport layer

application layer

presentation layer

session layer

data link layer

physical layer

Correct! Wrong!

What is a common protocol that is used with peer-to-peer applications such as WireShare, Bearshare, and Shareaza?

SMTP

Gnutella

Ethernet

POP

Correct! Wrong!

What type of information is contained in a DNS MX record?

the FQDN of the alias used to identify a service

the IP address of an authoritative name server

the domain name mapped to mail exchange servers

the IP address for an FQDN entry

Correct! Wrong!

What is a socket?

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

the combination of the source and destination sequence and acknowledgment numbers

the combination of the source and destination sequence numbers and port numbers

the combination of the source and destination IP address and source and destination Ethernet address

Correct! Wrong!

Which protocol uses encryption?

DHCP

DNS

HTTPS

FTP

Correct! Wrong!

The application layer of the TCP/IP model performs the functions of what three layers of the OSI model? (Choose three.)

Please select 3 correct answers

presentation

application

physical

data link

transport

session

network

Correct! Wrong!

Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

ACK

SYN

RST

FIN

Correct! Wrong!

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

FTP

SNMP

DHCP

ICMP

HTTP

Correct! Wrong!

Which three fields are used in a UDP segment header? (Choose three.)

Please select 3 correct answers

Window Size

Source Port

Length

Acknowledgment Number

Sequence Number

Checksum

Correct! Wrong!

Which three statements characterize UDP? (Choose three.)

Please select 3 correct answers

UDP provides connection-oriented, fast transport of data at Layer 3.

UDP relies on application layer protocols for error detection.

UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.

UDP relies on IP for error detection and recovery.

UDP provides basic connectionless transport layer functions.

UDP provides sophisticated flow control mechanisms.

Correct! Wrong!

Which three protocols operate at the application layer of the TCP/IP model? (Choose three.)

Please select 3 correct answers

UDP

FTP

DHCP

ARP

TCP

POP3

Correct! Wrong!

What is the TCP mechanism used in congestion avoidance ?

sliding window

socket pair

two-way handshake

three-way handshake

Correct! Wrong!

What information is used by TCP to reassemble and reorder received segments?

acknowledgment numbers

fragment numbers

port numbers

sequence numbers

Correct! Wrong!

Which applications or services allow hosts to act as client and server at the same time?

P2P applications

client/server applications

authentication services

email applications

Correct! Wrong!

Which number or set of numbers represents a socket?

10.1.1.15

192.168.1.1:80

01-23-45-67-89-AB

Correct! Wrong!

In what networking model would eDonkey, eMule, BitTorrent, Bitcoin, and LionShare be used?

client-based

master-slave

point-to-point

peer-to-peer

Correct! Wrong!

Which two types of applications are best suited for UDP? (Choose two.)

Please select 2 correct answers

applications that require reliable delivery

applications that handle reliability themselves

applications that need the reordering of segments

applications that can tolerate some data loss, but require little or no delay

applications that need data flow control

Correct! Wrong!

Why is DHCP preferred for use on large networks?

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

DHCP uses a reliable transport layer protocol.

It prevents sharing of files that are copyrighted.

Large networks send more requests for domain to IP address resolution than do smaller networks.

Hosts on large networks require more IP addressing configuration settings than hosts on small networks.

Correct! Wrong!

What is a key characteristic of the peer-to-peer networking model?

network printing using a print server

social networking without the Internet

wireless networking

resource sharing without a dedicated server

Correct! Wrong!

Which two fields are included in the TCP header but not in the UDP header? (Choose two.)

Please select 2 correct answers

destination port

window

source port

checksum

sequence number

Correct! Wrong!

Which three statements describe a DHCP Discover message? (Choose three.)

Please select 3 correct answers

The source MAC address is 48 ones (FF-FF-FF-FF-FF-FF).

The destination IP address is 255.255.255.255.

The message comes from a client seeking an IP address.

Only the DHCP server receives the message.

The message comes from a server offering an IP address.

All hosts receive the message, but only a DHCP server replies.

Correct! Wrong!

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

network access

transport

application

internet

Correct! Wrong!

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

slave

transient

master

client

Correct! Wrong!

Which factor determines TCP window size?

the amount of data to be transmitted

the amount of data the destination can process at one time

the amount of data the source is capable of sending at one time

the number of services included in the TCP segment

Correct! Wrong!

What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?

destination and source logical network addresses

timing and synchronization

destination and source physical addresses

destination and source port numbers

Correct! Wrong!

A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received three packets of data from the PC?

4500

6001

6000

4501

Correct! Wrong!

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

Please select 2 correct answers

FTP

HTTP

DNS

VoIP

POP3

Correct! Wrong!

What type of applications are best suited for using UDP?

applications that require retransmission of lost segments

applications that need reliable delivery

applications that are sensitive to packet loss

applications that are sensitive to delay

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting HTTPS service. What number will be used as the destination port number in the sending packet?

110

443

161

Correct! Wrong!

Which field in the TCP header indicates the status of the three-way handshake process?

window

reserved

control bits

checksum

Correct! Wrong!

What is a characteristic of UDP?

UDP only passes data to the network when the destination is ready to receive the data.

UDP reassembles the received datagrams in the order they were received.

UDP datagrams take the same path and arrive in the correct order at the destination.

Applications that use UDP are always considered unreliable.

Correct! Wrong!

What is an advantage of SMB over FTP?

SMB clients can establish a long-term connection to the server.

Only with SMB can data transfers occur in both directions.

Only SMB establishes two simultaneous connections with the client, making the data transfer faster.

SMB is more reliable than FTP because SMB uses TCP and FTP uses UDP.

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting telnet service. What number will be used as the destination port number in the sending packet?

161

443

110

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting SSH service. What number will be used as the destination port number in the sending packet?

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting SNMP service. What number will be used as the destination port number in the sending packet?

110

161

443

Correct! Wrong!

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

The server sends all requests through a default gateway.

Each request is tracked through the physical address of the client.

Each request is assigned source and destination port numbers.

The server uses IP addresses to identify different services.

Correct! Wrong!

Which protocol or service uses UDP for a client-to-server communication and TCP for server-to-server communication?

SMTP

HTTP

FTP

DNS

Correct! Wrong!

Which OSI layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?

transport

presentation

application

session

Correct! Wrong!

A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received two packets of data from the PC?

6000

6001

4500

3001

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting HTTP service. What number will be used as the destination port number in the sending packet?

Correct! Wrong!

Which networking model is being used when an author uploads one chapter document to a file server of a book publisher?

peer-to-peer

client/server

point-to-point

master-slave

Correct! Wrong!

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

Please select 2 correct answers

PSH

RST

FIN

SYN

URG

ACK

Correct! Wrong!

What is the function of the HTTP GET message?

to retrieve client email from an email server using TCP port 110

to request an HTML page from a web server

to send error information from a web server to a web client

to upload content to a web server from a web client

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting TFTP service. What number will be used as the destination port number in the sending packet?

Correct! Wrong!

Which two protocols may devices use in the application process that sends email? (Choose two.)

Please select 3 correct answers

POP

POP3

HTTP

SMTP

DNS

IMAP

Correct! Wrong!

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

The client sends a synchronization segment to begin the session.

The client randomly selects a source port number.

The client sets the window size for the session.

The client sends an ISN to the server to start the 3-way handshake.

Correct! Wrong!

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

ACK

POST

GET

PUT

Correct! Wrong!

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

index

http

www

.com

Correct! Wrong!

Why does HTTP use TCP as the transport layer protocol?

because transmission errors can be tolerated easily

to ensure the fastest possible download speed

because HTTP requires reliable delivery

because HTTP is a best-effort protocol

Correct! Wrong!

A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC?

10 segments

1000 segments

1 segment

100 segments

Correct! Wrong!

A manufacturing company subscribes to certain hosted services from its ISP. The services that are required include hosted world wide web, file transfer, and e-mail. Which protocols represent these three key applications? (Choose three.)

Please select 3 correct answers

HTTP

SNMP

DHCP

DNS

FTP

SMTP

Correct! Wrong!

Which application layer protocol uses message types such as GET, PUT, and POST?

POP3

DNS

DHCP

HTTP

SMTP

Correct! Wrong!

In what two situations would UDP be better than TCP as the preferred transport protocol? (Choose two.)

Please select 2 correct answers

when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated

when applications do not need to guarantee delivery of the data

when a faster delivery mechanism is needed

when delivery overhead is not an issue

when destination port numbers are dynamic

Correct! Wrong!

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

an ISP DHCP server

a home router

a DNS server

a dedicated file server

Correct! Wrong!

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

SMB

SMTP

DHCP

HTTP

Correct! Wrong!

What are three responsibilities of the transport layer? (Choose three.)

Please select 3 correct answers

formatting data into a compatible form for receipt by the destination devices

meeting the reliability requirements of applications, if any

directing packets towards the destination network

multiplexing multiple communication streams from many users or applications on the same network

identifying the applications and services on the client and server that should handle transmitted data

conducting error detection of the contents in frames

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting FTP service. What number will be used as the destination port number in the sending packet?

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting SMTP service. What number will be used as the destination port number in the sending packet?

443

110

161

Correct! Wrong!

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

Please select 2 correct answers

responsibility for logical addressing

responsibility for physical addressing

closest to the end user

the creation and maintenance of dialogue between source and destination applications

Correct! Wrong!

What is true about the Server Message Block protocol?

SMB messages cannot authenticate a session.

Different SMB message types have a different format.

Clients establish a long term connection to servers.

SMB uses the FTP protocol for communication.

Correct! Wrong!

A client creates a packet to send to a server. The client is requesting POP3 service. What number will be used as the destination port number in the sending packet?

110

Correct! Wrong!

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

Please select 3 correct answers

UDP

GIF

TCP

HTTP

MPEG

Correct! Wrong!

Which protocol is used by a client to communicate securely with a web server?

SMTP

HTTPS

SMB

IMAP

Correct! Wrong!

What is an example of network communication that uses the client-server model?

A user prints a document by using a printer that is attached to a workstation of a coworker.

A user uses eMule to download a file that is shared by a friend after the file location is determined.

A workstation initiates an ARP to find the MAC address of a receiving host.

A workstation initiates a DNS request when the user types www.cisco.com in the address bar of a web browser.

Correct! Wrong!

Which two characteristics are associated with UDP sessions? (Choose two.)

Please select 2 correct answers

Transmitted data segments are tracked.

Received data is unacknowledged.

Destination devices receive traffic with minimal delay.

Destination devices reassemble messages and pass them to an application.

Unacknowledged data packets are retransmitted.

Correct! Wrong!

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

to assemble the segments that arrived out of order

to inquire for a nonreceived segment

to keep track of multiple conversations between devices

to notify the remote device that the conversation is over

Correct! Wrong!

Which scenario describes a function provided by the transport layer?

A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.

A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network.

A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.

A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.

Correct! Wrong!

What does a client do when it has UDP datagrams to send?

It sends a simplified three-way handshake to the server.

It queries the server to see if it is ready to receive data.

It just sends the datagrams.

It sends to the server a segment with the SYN flag set to synchronize the conversation.

Correct! Wrong!

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

Please select 2 correct answers

providing IP addresses to local hosts

allowing data transfer between two network devices

mapping name-to-IP addresses for internal hosts

forwarding name resolution requests between servers

retrieving email messages

Correct! Wrong!

A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received four packets of data from the PC?

6001

3001

1500

1501

Correct! Wrong!

Which statement is true about FTP?

The client can choose if FTP is going to establish one or two connections with the server.

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.

Correct! Wrong!

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

Please select 2 correct answers

reconstructing data in the order received

identifying the applications

retransmitting any unacknowledged data

acknowledging received data

tracking individual conversations

Correct! Wrong!

ITN | Modules 14 – 15

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ITN | Modules 14 – 15

How are port numbers used in the TCP/IP encapsulation process?

What is a responsibility of transport layer protocols?

What are two characteristics of peer-to-peer networks? (Choose two.)

What do the client/server and peer-to-peer network models have in common?

Which layer in the TCP/IP model is used for formatting, compressing, and encrypting data?

What are two roles of the transport layer in data communication on a network? (Choose two.)

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

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

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

Which three application layer protocols use TCP? (Choose three.)

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?

What kind of port must be requested from IANA in order to be used with a specific application?

Which transport layer feature is used to guarantee session establishment?

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?

Which three layers of the OSI model provide similar network services to those provided by the application layer of the TCP/IP model? (Choose three.)

What is a common protocol that is used with peer-to-peer applications such as WireShare, Bearshare, and Shareaza?

What type of information is contained in a DNS MX record?

What is a socket?

Which protocol uses encryption?

The application layer of the TCP/IP model performs the functions of what three layers of the OSI model? (Choose three.)

Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

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

Which three fields are used in a UDP segment header? (Choose three.)

Which three statements characterize UDP? (Choose three.)

Which three protocols operate at the application layer of the TCP/IP model? (Choose three.)

What is the TCP mechanism used in congestion avoidance ?

What information is used by TCP to reassemble and reorder received segments?

Which applications or services allow hosts to act as client and server at the same time?

Which number or set of numbers represents a socket?

In what networking model would eDonkey, eMule, BitTorrent, Bitcoin, and LionShare be used?

Which two types of applications are best suited for UDP? (Choose two.)

Why is DHCP preferred for use on large networks?

What is a key characteristic of the peer-to-peer networking model?

Which two fields are included in the TCP header but not in the UDP header? (Choose two.)

Which three statements describe a DHCP Discover message? (Choose three.)

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

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?

Which factor determines TCP window size?

What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?

A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received three packets of data from the PC?

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

What type of applications are best suited for using UDP?

A client creates a packet to send to a server. The client is requesting HTTPS service. What number will be used as the destination port number in the sending packet?

Which field in the TCP header indicates the status of the three-way handshake process?

What is a characteristic of UDP?

What is an advantage of SMB over FTP?​

A client creates a packet to send to a server. The client is requesting telnet service. What number will be used as the destination port number in the sending packet?

A client creates a packet to send to a server. The client is requesting SSH service. What number will be used as the destination port number in the sending packet?

A client creates a packet to send to a server. The client is requesting SNMP service. What number will be used as the destination port number in the sending packet?

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

Which protocol or service uses UDP for a client-to-server communication and TCP for server-to-server communication?

Which OSI layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?

A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received two packets of data from the PC?

A client creates a packet to send to a server. The client is requesting HTTP service. What number will be used as the destination port number in the sending packet?

Which networking model is being used when an author uploads one chapter document to a file server of a book publisher?

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

What is the function of the HTTP GET message?

A client creates a packet to send to a server. The client is requesting TFTP service. What number will be used as the destination port number in the sending packet?

Which two protocols may devices use in the application process that sends email? (Choose two.)

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

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

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

Why does HTTP use TCP as the transport layer protocol?

A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC?

A manufacturing company subscribes to certain hosted services from its ISP. The services that are required include hosted world wide web, file transfer, and e-mail. Which protocols represent these three key applications? (Choose three.)

Which application layer protocol uses message types such as GET, PUT, and POST?

In what two situations would UDP be better than TCP as the preferred transport protocol? (Choose two.)

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

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

What are three responsibilities of the transport layer? (Choose three.)

A client creates a packet to send to a server. The client is requesting FTP service. What number will be used as the destination port number in the sending packet?

A client creates a packet to send to a server. The client is requesting SMTP service. What number will be used as the destination port number in the sending packet?

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

What is true about the Server Message Block protocol?

A client creates a packet to send to a server. The client is requesting POP3 service. What number will be used as the destination port number in the sending packet?

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

Which protocol is used by a client to communicate securely with a web server?

What is an example of network communication that uses the client-server model?

Which two characteristics are associated with UDP sessions? (Choose two.)

What is an advantage of SMB over FTP?