Cisco Chapter 9 test for final
Which of the following is used to identify the socket? (choose 2) ACK bit Port # MAC address IP address SYN bit
Port #, IP address
Which of the following applictions/protocols use TCP? (Choose 3) SMTP FTP HTTP DNS DHCP
SMTP, FTP, HTTP
Which of the following allows for multiplexing, allowing multiple applications to use the network at the same time, and helps facilitate data be carried over the network by lower network layers? protocols interleaving Segmentation fragmentation
Segmentation
Which PDU is at the transport layer? Data Packets Segments Frames
Segments
a value between 1024 and 65535 used to uniquely identify the source application or process on a local host
source port
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) POP3
110
Which number or set of numbers represents a socket? 01-23-45-67-89-AB 21 192.168.1.1:80 10.1.1.15
192.168.1.1:80
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) FTP
20-21
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) Telnet
23
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) HTTPS
443
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) DNS
53
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) HTTP
80
Which layer of the OSI model is closest to and interacts with the user? Session Transport Presentation Application
Application
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. (Not all options are used.) step 4 client sends ACK client sends FIN server sends ACK server sends FIN
Client sends ACK
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. (Not all options are used.) step 1 client sends ACK client sends FIN server sends ACK server sends FIN
Client sends FIN
What is the last control bit set that tells the sender there is no more data? RST FIN SYN ACK
FIN
During the three-way handshake process, what happens if an acknowledgement isn't sent that data was received during a TCP session? Data will be dropped and the sender will be notified Host will send the next segment, regardless if the previous one was acknowledged. Host will resend the data because it reached a timeout Data will be dropped and marked as undeliverable
Host will resend the data because it reached a timeout
Which three fields are used in a UDP segment header? (Choose three.) Window Size Length Source Port Acknowledgment Number Checksum Sequence Number
Length, Source Port, Checksum
Match the protocol with its characteristic: Connection-oriented TCP UDP
TCP
Match the protocol with its characteristic: Flow control TCP UDP
TCP
Match the protocol with its characteristic: Sequencing of segments TCP UDP
TCP
a connection-oriented reliable protocol that uses a 3-way handshake
TCP
Which transport layer feature is used to guarantee session establishment? UDP ACK flag TCP 3-way handshake UDP sequence number TCP port number
TCP 3-way handshake
Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer? The client sets the window size for the session. The client sends an ISN to the server to start the 3-way handshake. The client randomly selects a source port number. The client sends a synchronization segment to begin the session.
The client randomly selects a source port number
What is the purpose of the transport layer? Makes packets from the segments as it is passed down from the upper layers Track individual communications using port numbers Performs all encoding using error detection services Creates the electrical, optical, or microwave signal that represents the bits in each frame and get them on to the media.
Track individual communications using port numbers
Match the protocol with its characteristic: Connectionless TCP UDP
UDP
Match the protocol with its characteristic: Less Overhead TCP UDP
UDP
Match the protocol with its characteristic: No Acknowledgments sent TCP UDP
UDP
What is defined as the number of bytes that the destination device of a TCP session can accept and process at one time? Window size Flow Control Segment Sequence number
Window size
What type of applications are best suited for using UDP? applications that are sensitive to delay applications that need reliable delivery applications that require retransmission of lost segments applications that are sensitive to packet loss
applications that are sensitive to delay
a data delivery method that has no service guarantee
best effort delivery
used to describe the reliable nature of TCP. The connection refers to the 3-way handshake required in TCP before data transmission.
connection-oriented
the combining of many different conversations into one data stream
conversation multiplexing
the name of the UDP PDU
datagrams
a port value that uniquely identifies the destination application
destination port
ports that are dynamically assigned to communication sessions as needed and are typically in the numerical range of 1024 to 65535
dynamic ports
a mechanism that is used with TCP to control the amount of traffic that is sent from the source to the destination
flow control
a utility that tracks TCP connections on network hosts
netstat
a block of application data created to facilitate network transport
segment
a connection between systems
session
What is the purpose of using a source port number in a TCP communication? 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 to inquire for a nonreceived segment
to keep track of multiple conversations between devices
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 network data link session
transport
port numbers in the range of 1-1024 that identify network applications that are well known such as web, email, and remote login applications
well-known ports
Match the following common port numbers with their matching protocol: (1 pt. each, 7 total) SMTP
25
Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead? (Choose two) FTP DNS HTTP POP3 VoIP
DNS, VoIP
Which of the following services use UDP? (Choose 3) Web Browsers DNS E-mail VoIP Video Streaming
DNS, VoIP, Video Streaming
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. (Not all options are used.) step 2 client sends ACK client sends FIN server sends ACK server sends FIN
Server sends ACK
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. (Not all options are used.) step 3 client sends ACK client sends FIN server sends ACK server sends FIN
Server sends FIN
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 decreases the window size. The destination sends fewer acknowledgement messages in order to conserve bandwidth.
The source decreases the amount of data that it transmits before it receives an acknowledgement from the destination
Which layer 4 protocol generates less overhead therefore has faster data transfer rates? TCP HTTP UDP IP
UDP
a connectionless protocol that has little overhead and is used for communication data such as voice and video
UDP
What is an advantage of UDP over TCP? UDP communication requires less overhead. UDP communication is more reliable. UDP reorders segments that are received out of order. UDP acknowledges received data.
UDP communication requires less overhead
What are three responsibilities of the transport layer? (Choose three.) 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 directing packets towards the destination network formatting data into a compatible form for receipt by the destination devices conducting error detection of the contents in frames
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
numbers that are assigned to the source and destination at Layer 4 to uniquely identify the communication
port numbers
Refer to the exhibit. What does the value of the window size specify? the amount of data that can be sent at one time the total number of bits received during this TCP session the amount of data that can be sent before an acknowledgment is required a random number that is used in establishing a connection with the 3-way handshake
the amount of data that can be sent before an acknowledgment is required
What is the purpose of the TCP sliding window? to inform a source to retransmit data from a specific point forward to request that a source decrease the rate at which it transmits data to end communication when data transmission is complete to ensure that segments arrive in order at the destination
to request that a source decrease the rate at which it transmits data