cisco chapter 9
Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?
ACK
What is the complete range of TCP and UDP well-known ports?
Correct Response 0 to 1023
Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead?
DNS & VoIP
Which two characteristics are associated with UDP sessions?
Destination devices receive traffic with minimal delay. & Received data is unacknowledged.
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.
What kind of port must be requested from IANA in order to be used with a specific application?
registered port
What does the value of the window size specify? window size: 9017
the amount of data that can be sent before an acknowledgment is required
Which factor determines TCP window size?
the amount of data the destination can process at one time
What is a socket?
the combination of a source IP address and port number or a destination IP address and port number
During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?
the next byte that the destination expects to receive
What is the purpose of using a source port number in a TCP communication?
to keep track of multiple conversations between devices
What is the purpose of the TCP sliding window?
to request that a source decrease the rate at which it transmits data
What OSI layer is responsible for establishing a temporary communication session between two applications and ensuring that transmitted data can be reassembled in proper sequence?
transport
When is UDP preferred to TCP?
when an application can tolerate some loss of data during transmission
A client application needs to terminate a TCP communication session with a server. Place the termination process steps in the order that they will occur.
1.Client sends FIN 2.Server sends ACK 3.Server sends FIN 4.Client sends ACK
Which number or set of numbers represents a socket?
192.168.1.1:80
Which three application layer protocols use TCP?
FTP & SMTP & HTTP
What does a client do when it has UDP datagrams to send?
It just sends the datagrams.
Which three fields are used in a UDP segment header?
Length & source port & checksum
Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices?
SYN & ACK
Which transport layer feature is used to guarantee session establishment?
TCP 3-way handshake
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.
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.
What is a characteristic of a TCP server process?
There can be many ports open simultaneously on a server, one for each active server application.
What is an advantage of UDP over TCP?
UDP communication requires less overhead.
What type of applications are best suited for using UDP?
applications that are sensitive to delay
What type of information is included in the transport header?
destination and source port numbers
What are three responsibilities of the transport layer?
meeting the reliability requirements of applications, if any 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
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?
multiplexing
