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