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gymnastics > Chapter 9 > Flashcards

Chapter 9 Flashcards

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1
Q

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

  • Destination devices receive traffic with minimal delay.
  • Transmitted data segments are tracked.
  • Destination devices reassemble messages and pass them to an application.
  • Received data is unacknowledged.
  • Unacknowledged data packets are retransmitted.
A

Destination devices receive traffic with minimal delay.

Received data is unacknowledged.

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2
Q

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 FTP source host sends a query to the destination host.
  • The part of the FTP message that was lost is re-sent.
  • The entire FTP message is re-sent.
A

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

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3
Q

A host device needs to send a large video file across the network while providing data communication to other users. Which feature will allow different communication streams to occur at the same time, without having a single data stream using all available bandwidth?

  • window size
  • multiplexing
  • port numbers
  • acknowledgments
A

multiplexing

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4
Q

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

  • registered port
  • private port
  • dynamic port
  • source port
A

registered port

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5
Q

What type of information is included in the transport header?

  • destination and source logical addresses
  • destination and source physical addresses
  • destination and source port numbers*
  • encoded application data
A

destination and source port numbers

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6
Q

What is a socket?

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

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

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7
Q

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

  • 0 to 255
  • 0 to 1023
  • 256 – 1023
  • 1024 – 49151
A

0 to 1023

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8
Q

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

  • FIN
  • ACK*
  • SYN
  • RST
A

ACK

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9
Q

What is a characteristic of a TCP server process?

  • Every application process running on the server has to be configured to use a dynamic port number.
  • There can be many ports open simultaneously on a server, one for each active server application.
  • An individual server can have two services assigned to the same port number within the same transport layer services.
  • A host running two different applications can have both configured to use the same server port
A

There can be many ports open simultaneously on a server, one for each active server application.

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10
Q 
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
FIN
PSH
RST
SYN
URG
A

ACK

SYN

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11
Q 
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?
1 segment
10 segments
100 segments
1000 segments
A

10 segments

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12
Q

Which factor determines TCP window size?

  • the amount of data to be transmitted
  • the number of services included in the TCP segment
  • the amount of data the destination can process at one time
  • the amount of data the source is capable of sending at one time
A

the amount of data the destination can process at one time

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13
Q

During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?

  • the total number of bytes that have been received
  • one number more than the sequence number
  • the next byte that the destination expects to receive
  • the last sequence number that was sent by the source
A

the next byte that the destination expects to receive

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14
Q

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

  • port numbers
  • sequence numbers
  • acknowledgment numbers
  • fragment numbers
A

sequence numbers

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15
Q

What does TCP do if the sending source detects network congestion on the path to the destination?

  • The source host will send a request for more frequent acknowledgments to the destination.
  • The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination.
  • The destination will request retransmission of the entire message.
  • The source will acknowledge the last segment that is sent and include a request for a smaller window size in the message.
A

The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination

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16
Q

What is a characteristic of UDP?

  • UDP datagrams take the same path and arrive in the correct order at the destination.
  • Applications that use UDP are always considered unreliable.
  • UDP reassembles the received datagrams in the order they were received.*
  • UDP only passes data to the network when the destination is ready to receive the data
A

UDP reassembles the received datagrams in the order they were received

17
Q

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

  • It just sends the datagrams.
  • It queries the server to see if it is ready to receive data.
  • It sends a simplified three-way handshake to the server.
  • It sends to the server a segment with the SYN flag set to synchronize the conversation.
A

It just sends the datagrams

18
Q

What happens if the first packet of a TFTP transfer is lost?

  • The client will wait indefinitely for the reply.
  • The TFTP application will retry the request if a reply is not received.
  • The next-hop router or the default gateway will provide a reply with an error code.
  • The transport layer will retry the query if a reply is not received.
A

The TFTP application will retry the request if a reply is not received

19
Q

A host device is receiving live streaming video. How does the device account for video data that is lost during transmission?

  • The device will immediately request a retransmission of the missing data.
  • The device will use sequence numbers to pause the video stream until the correct data arrives.
  • The device will delay the streaming video until the entire video stream is received.
  • The device will continue receiving the streaming video, but there may be a momentary disruption.
A

The device will continue receiving the streaming video, but there may be a momentary disruption

20
Q

Why does HTTP use TCP as the transport layer protocol?

  • to ensure the fastest possible download speed
  • because HTTP is a best-effort protocol
  • because transmission errors can be tolerated easily
  • because HTTP requires reliable delivery
A

because HTTP requires reliable delivery

21
Q

When is UDP preferred to TCP?

  • when a client sends a segment to a server
  • when all the data must be fully received before any part of it is considered useful
  • when an application can tolerate some loss of data during transmission
  • when segments must arrive in a very specific sequence to be processed successfully
A

when an application can tolerate some loss of data during transmission

22
Q 
Which three application layer protocols use TCP? (Choose three.)
SMTP
FTP
SNMP
HTTP
TFTP
DHCP
A

SMTP
FTP
HTTP

gymnastics (2 decks)

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