CCNA 1 Chapter 9
Which three application layer protocols use TCP? (Choose three.) SMTP FTP SNMP HTTP TFTP DHCP
SMTP FTP HTTP
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
ACK
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.
Destination devices receive traffic with minimal delay. Received data is unacknowledged.
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.
The part of the FTP message that was lost is re-sent.
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.
The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination.
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.
UDP reassembles the received datagrams in the order they were received.
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
because HTTP requires reliable delivery
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
destination and source port numbers
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
multiplexing
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
registered port
What information is used by TCP to reassemble and reorder received segments? port numbers sequence numbers acknowledgment numbers fragment numbers
sequence numbers
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
the next byte that the destination expects to receive
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
when an application can tolerate some loss of data during transmission
