▷ CCNA1 v7 ITN | Modules 14 - 15 Exam Answers

CCNA1 v7 Modules 14 - 15 Exam Answers

Summary

Check answers here: CCNA1 v7 ITN Modules 14 – 15: Communicating Between Networks Exam Answers. CCNA 200-301 Passed 100% !!

This exam will cover material from Modules 14- 15 Network Application Communications of the CCNA1 – Introduction to Networks v7.0 (ITN) curriculum. This exam will be scored using the Weighted Model where each MCSA (Multiple-Choice Single-Answer) is worth two points and each MCMA (Multiple-Choice Multiple-Answer) is worth one point for each correct option. Other tasks types such as fill-in-the-blank, drag and drop (matching) and Packet Tracer items may be included in this exam. For Packet Tracer tasks, you must have the latest version of Packet Tracer installed on your machine.

This exam will cover material from Modules 14 – 15 of the CCNA1 – Introduction to Networks v7.0 (ITN) curriculum.

This exam will be scored using the Weighted Model where each MCSA (Multiple-Choice Single-Answer) is worth two points and each MCMA (Multiple-Choice Multiple-Answer) is worth one point for each correct option. If more options are selected than required, the student will receive a score of zero.

CCNA1 v7 Network Application Communications Exam Answers

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!

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

The server uses IP addresses to identify different services.

Each request is assigned source and destination port numbers.

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

The server sends all requests through a default gateway.

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

DNS

HTTP

FTP

SNMP

SMTP

DHCP

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

network access

application

internet

transport

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 numbers and port numbers

the combination of the source and destination sequence and acknowledgment numbers

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

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!

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

Please select 3 correct answers

SNMP

FTP

DHCP

SMTP

HTTP

TFTP

Correct! Wrong!

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

GET

ACK

POST

PUT

Correct! Wrong!

Which transport layer feature is used to guarantee session establishment?

TCP port number

TCP 3-way handshake

UDP ACK flag

UDP sequence number

Correct! Wrong!

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

point-to-point

peer-to-peer

master-slave

client-based

Correct! Wrong!

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

HTTP

POP3

DNS

DHCP

SMTP

Correct! Wrong!

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

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

Both models have dedicated servers.

Both models are used only in the wired network environment.

Both models support devices in server and client roles.

Correct! Wrong!

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

P2P applications

email applications

client/server applications

authentication services

Correct! Wrong!

Why is DHCP preferred for use on large networks?

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

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

DHCP uses a reliable transport layer protocol.

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

It prevents sharing of files that are copyrighted.

Correct! Wrong!

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

DNS

SMTP

FTP

HTTP

Correct! Wrong!

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

Please select 3 correct answers

HTTP

POP3

POP

SMTP

IMAP

DNS

Correct! Wrong!

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

Please select 2 correct answers

centralized user accounts

resource sharing without a dedicated server

scalability

decentralized resources

one way data flow

Correct! Wrong!

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

POP3

SMTP

SNMP

HTTP

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?

6000

4500

4501

6001

Correct! Wrong!

What type of applications are best suited for using UDP?

applications that need reliable delivery

applications that are sensitive to packet loss

applications that are sensitive to delay

applications that require retransmission of lost segments

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!

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?

443

161

110

Correct! Wrong!

Which statement is true about FTP?

FTP does not provide reliability during data transmission.

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

FTP is a peer-to-peer application.

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

Correct! Wrong!

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

internetwork

network access

session

application

presentation

Correct! Wrong!

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

master-slave

client/server

peer-to-peer

point-to-point

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 randomly selects a source port number.

The client sets the window size for the session.

The client sends a synchronization segment to begin the session.

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

Correct! Wrong!

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

Please select 2 correct answers

sequence number

checksum

destination port

source port

window

Correct! Wrong!

What is the TCP mechanism used in congestion avoidance ?

sliding window

three-way handshake

two-way handshake

socket pair

Correct! Wrong!

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

Please select 3 correct answers

Window Size

Sequence Number

Checksum

Source Port

Acknowledgment Number

Length

Correct! Wrong!

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

Please select 2 correct answers

responsibility for physical addressing

closest to the end user

responsibility for logical addressing

the creation and maintenance of dialogue between source and destination applications

Correct! Wrong!

Which number or set of numbers represents a socket?

01-23-45-67-89-AB

192.168.1.1:80

10.1.1.15

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 a faster delivery mechanism is needed

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

when delivery overhead is not an issue

when destination port numbers are dynamic

when applications do not need to guarantee delivery of the data

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

ACK

RST

PSH

URG

FIN

SYN

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

The source decreases the window size to decrease the rate of transmission from the destination.

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

The destination decreases the window size.

Correct! Wrong!

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

SMB

HTTP

DHCP

SMTP

Correct! Wrong!

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

session

application

transport

presentation

Correct! Wrong!

What is the function of the HTTP GET message?

to request an HTML page from a web server

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

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!

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

reserved

window

checksum

control bits

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 factor determines TCP window size?

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

the number of services included in the TCP segment

the amount of data the destination can process at one time

the amount of data to be transmitted

Correct! Wrong!

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

ICMP

HTTP

DHCP

FTP

SNMP

Correct! Wrong!

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

Ethernet

SMTP

Gnutella

POP

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

RST

SYN

FIN

Correct! Wrong!

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

0 to 1023

1024 – 49151

0 to 255

256 – 1023

Correct! Wrong!

What is an advantage of SMB over FTP?

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.

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

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 SMTP service. What number will be used as the destination port number in the sending packet?

161

443

110

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?

master

client

transient

server

slave

Correct! Wrong!

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

Please select 2 correct answers

identifying the applications

retransmitting any unacknowledged data

acknowledging received data

tracking individual conversations

reconstructing data in the order received

Correct! Wrong!

Which protocol uses encryption?

FTP

DHCP

HTTPS

DNS

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?

100 segments

10 segments

1000 segments

1 segment

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

1500

1501

3001

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

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.

Correct! Wrong!

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

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

Source port and destination port numbers are randomly generated.

Destination port numbers are assigned automatically and cannot be changed.

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

Correct! Wrong!

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

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

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

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

The entire FTP message is re-sent.

Correct! Wrong!

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

acknowledgment numbers

sequence numbers

port numbers

fragment numbers

Correct! Wrong!

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

Please select 2 correct answers

applications that need the reordering of segments

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

applications that handle reliability themselves

applications that require reliable delivery

applications that need data flow control

Correct! Wrong!

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

network printing using a print server

wireless networking

resource sharing without a dedicated server

social networking without the Internet

Correct! Wrong!

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

Please select 2 correct answers

forwarding name resolution requests between servers

retrieving email messages

allowing data transfer between two network devices

mapping name-to-IP addresses for internal hosts

providing IP addresses to local hosts

Correct! Wrong!

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

to inquire for a nonreceived segment

to notify the remote device that the conversation is over

to assemble the segments that arrived out of order

to keep track of multiple conversations between devices

Correct! Wrong!

What is true about the Server Message Block protocol?

Clients establish a long term connection to servers.

SMB messages cannot authenticate a session.

SMB uses the FTP protocol for communication.

Different SMB message types have a different format.

Correct! Wrong!

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

registered port

source port

dynamic port

private port

Correct! Wrong!

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

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

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

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

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

Correct! Wrong!

What is a characteristic of UDP?

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

Applications that use UDP are always considered unreliable.

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

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

Correct! Wrong!

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

Please select 2 correct answers

Destination devices receive traffic with minimal delay.

Unacknowledged data packets are retransmitted.

Transmitted data segments are tracked.

Destination devices reassemble messages and pass them to an application.

Received data is unacknowledged.

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

physical layer

session layer

data link layer

application layer

presentation layer

transport layer

Correct! Wrong!

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

a dedicated file server

a home router

a DNS server

an ISP DHCP server

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 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 message comes from a server offering an IP address.

Only the DHCP server receives the message.

The message comes from a client seeking an IP address.

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

The destination IP address is 255.255.255.255.

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 for an FQDN entry

the IP address of an authoritative name server

the domain name mapped to mail exchange servers

Correct! Wrong!

Why does HTTP use TCP as the transport layer protocol?

because transmission errors can be tolerated easily

because HTTP is a best-effort protocol

because HTTP requires reliable delivery

to ensure the fastest possible download speed

Correct! Wrong!

Which three statements characterize UDP? (Choose three.)

Please select 3 correct answers

UDP relies on IP for error detection and recovery.

UDP provides basic connectionless transport layer functions.

UDP relies on application layer protocols for error detection.

UDP provides sophisticated flow control mechanisms.

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

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

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?

SMTP

POP

IMAP

HTTPS

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

session

network

physical

presentation

transport

application

data link

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?

161

110

443

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

HTTP

TCP

MPEG

UDP

GIF

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

directing packets towards the destination network

meeting the reliability requirements of applications, if any

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

conducting error detection of the contents in frames

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

Correct! Wrong!

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

.com

http

index

www

Correct! Wrong!

What is a responsibility of transport layer protocols?

translating private IP addresses to public IP addresses

determining the best path to forward a packet

providing network access

tracking individual conversations

Correct! Wrong!

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

Please select 2 correct answers

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

providing frame delimiting to identify bits making up a frame

identifying the proper application for each communication stream

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!

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

Please select 3 correct answers

POP3

DHCP

ARP

TCP

UDP

FTP

Correct! Wrong!

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

SMTP

SMB

HTTPS

IMAP

Correct! Wrong!

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

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.

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

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 port numbers

destination and source physical addresses

timing and synchronization

destination and source logical network addresses

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?

110

443

161

Correct! Wrong!

ITN | Modules 14 – 15

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CCNA3 v7 ENSA | Final Exam Answers

CCNA3 v7 ENSA | Modules 13 – 14 Exam Answers

CCNA3 v7 ENSA | Modules 9 – 12 Exam Answers

CCNA1 v7 ITN | Modules 14 – 15 Exam Answers

CCNA1 v7 Modules 14 - 15 Exam Answers

CCNA1 v7 Network Application Communications Exam Answers

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?

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

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.)

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

What is a socket?

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?

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

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

Which transport layer feature is used to guarantee session establishment?

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

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

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

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

Why is DHCP preferred for use on large networks?

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

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

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

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

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?

What type of applications are best suited for using UDP?

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

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 statement is true about FTP?

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

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

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

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

What is the TCP mechanism used in congestion avoidance ?

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

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

Which number or set of numbers represents a socket?

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

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

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?

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

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

What is the function of the HTTP GET message?

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

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 factor determines TCP window size?

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

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

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

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

What is an advantage of SMB over FTP?​

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 SMTP service. What number will be used as the destination port number in the sending packet?

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

Which protocol uses encryption?

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 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?

Which scenario describes a function provided by the transport layer?

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

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

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

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

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

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

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

What is true about the Server Message Block protocol?

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

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

What is a characteristic of UDP?

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

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.)

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

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

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

Why does HTTP use TCP as the transport layer protocol?

Which three statements characterize UDP? (Choose three.)

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?

What is an advantage of SMB over FTP?