Chapter 8
What does a client do when it has UDP datagrams to send?
It sends the datagrams.
Which application layer protocols use TCP?
Telnet, FTP, and HTTP.
What is the complete range of TCP and UDP well known ports?
0 to 1023
If the TCP window is 1000 bytes and 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.
Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?
ACK
During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?
Represents that the data has been received.
The device will continue receiving the streaming video, but there may be a momentary disruption. A host device is receiving live streaming video.
A host device is receiving live streaming video. How does the device account for video data that is lost during transmission?
Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices?
ACK and SYN
The amount of data the destination can process at one time.
The amount of data the destination can process at one time. What factor determines TCP window size?
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 if the first packet of a TFTP transfer is lost?
The rest of the data is continued because TFTP works under UDP.
What are the characteristic of a TCP server process?
There can be many ports open simultaneously on a server, one for each active server application.
What are the characteristics of UDP?
UDP reassembles the received datagrams in the order they were received.
Which application layer protocols use UDP?
VoIP, DHCP, and TFTP.
Destination devices receive traffic with minimal delay and received data is unacknowledged.
What characteristics are associated with UDP sessions?
The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination.
What does TCP do if the sending source detects network congestion on the path to the destination?
Multiplexing.
What feature will allow different communication streams to occur at the same time, without having a single data stream using all available bandwidth?
Destination and source port numbers.
What information is included in the transport header?
Sequence numbers.
What information is used by TCP to reassemble and reorder received segments?
The combination of a source IP address and port number of a destination IP address and port number and used to identify the server and service being requested by the client.
What is a socket?
Registered Ports (numbers 1024 to 49151)
What kind of port must be requested from IANA in order to be used with a specific application?
When is UDP preferred to TCP?
When speed is important and proper order is not.
HTTP requires reliable delivery.
Why does HTTP use TCP as the transport layer protocol?