NET 125 CH14

Which layer is responsible for establishing a temporary communication session between source and destination host applications? -application layer -data link layer -network layer -physical layer -transport layer

transport layer

Which transport layer protocol would be used for VoIP applications? -Session Information Protocol (SIP) -Transmission Control Protocol (TCP) -User Datagram Protocol (UDP) -VoIP Transfer Protocol

udp

Which port group includes port numbers for FTP, HTTP, and TFTP applications? dynamic ports private ports registered ports well-known ports

well-known ports

Which transport layer feature is used to establish a connection-oriented session? UDP sequence number TCP port number TCP 3-way handshake UDP ACK flag

TCP 3-way handshake

Which transport layer protocol ensures reliable same-order delivery? -ICMP -IP -TCP -UDP

tcp

What is the purpose of using a source port number in a TCP communication? -to assemble the segments that arrived out of order -to notify the remote device that the conversation is over -to keep track of multiple conversations between devices -to inquire for a nonreceived segment

-to keep track of multiple conversations between devices

What is a responsibility of transport layer protocols? -tracking individual conversations -translating private IP addresses to public IP addresses -providing network access -determining the best path to forward a packet

-tracking individual conversations

Which TCP header statement is true? -It consists of 4 fields in an 8-byte header. -It consists of 8 fields in a 10-byte header. -It consists of 10 fields in a 20-byte -header. -It consists of 20 fields in a 40-byte header.

It consists of 10 fields in a 20byte header

Which control bit flags are used during the three-way handshake? ACK and FIN FIN and RESET RESET and SYN SYN and ACK

SYN and ACK

Which of the following is a stateless best-effort delivery transport layer protocol? ICMP IP TCP UDP

UDP

How many exchanges are needed to end both sessions between two hosts? one exchange two exchanges three exchanges four exchanges five exchanges

four exchanges

Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state? ipconfig /all ping netstat traceroute

netstat

How does a networked server manage requests from multiple clients for different services? -Each request has a combination of source and destination port numbers, coming from a unique IP address. -The server sends all requests through a default gateway. -Each request is tracked through the physical address of the client. -The server uses IP addresses to identify different services.

-Each request has a combination of source and destination port numbers, coming from a unique IP address.

Which two operations are provided by TCP but not by UDP? (Choose two.) -acknowledging received data -reconstructing data in the order received -retransmitting any unacknowledged data -identifying individual conversations -identifying the applications

-acknowledging received data -retransmitting any unacknowledged data

Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices? (Choose two.) ACK SYN RST URG FIN PSH

ACK SYN

Which TCP header statement is true? It consists of 4 fields in an 8-byte header. It consists of 8 fields in a 10-byte header. It consists of 10 fields in a 20-byte header. It consists of 20 fields in a 40-byte header.

It consists of 10 fields in a 20-byte header.

Which two fields are the same in a TCP and UDP header? (Choose two.) Control bits Destination port number Sequence number Source port number Well-known port number

Source port number Destination port number

Which of the following would be valid source and destination ports for a host connecting to an email server? Source: 25, Destination: 49152 Source: 80, Destination: 49152 Source: 49152, Destination: 25 Source: 49152, Destination: 80

Source: 49152, Destination: 25

Which of the following would be valid source and destination ports for a host connecting to a DNS server? Source: 53, Destination: 49152 Source: 1812, Destination: 49152 Source: 49152, Destination: 53 Source: 49152, Destination: 1812

Source: 49152, Destination: 53

Which transport layer protocol ensures reliable same-order delivery? ICMP IP TCP UDP

TCP

Which transport layer protocol statement is true? -TCP has fewer fields than UDP. -TCP is faster than UDP. -UDP is a best-effort delivery protocol. -UDP provides reliability.

UDP is best effort delivery protocol

Which UDP datagram reassembly statement is true? UDP does not reassemble the data. UDP reassembles the data in the order that it was received. UDP reassembles the data using control bits. UDP reassembles the data using sequence numbers.

UDP reassembles the data in the order that it was received.

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 part of the FTP message that was lost is re-sent. -The FTP source host sends a query to the destination host. -The entire FTP message is re-sent.

-The part of the FTP message that was lost is re-sent.

What is the complete range of TCP and UDP well-known ports? 256 - 1023 1024 - 49151 0 to 255 0 to 1023

0-1023

What happens when a sending host senses there is congestion? -The receiving host increases the number of bytes it sends before receiving an acknowledgment from the sending host. -The receiving host reduces the number of bytes it sends before receiving an acknowledgment from the sending host. -The sending host increases the number of bytes it sends before receiving an acknowledgment from the destination host. -The sending host reduces the number of bytes it sends before receiving an acknowledgment from the destination host.

-The sending host reduces the number of bytes it sends before receiving an acknowledgment from the destination host.

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 destination sends fewer acknowledgement messages in order to conserve bandwidth. -The source decreases the window size to decrease the rate of transmission from the destination. -The destination decreases the window size. -The source decreases the amount of data that it transmits before it receives an acknowledgement from the destination.

-The source decreases the amount of data that it transmits before it receives an acknowledgement from the destination.

What type of applications are best suited for using UDP? -applications that are sensitive to delay -applications that require retransmission of lost segments -applications that are sensitive to packet loss -applications that need reliable delivery

-applications that are sensitive to delay

Which three are transport layer responsibilities? -conversation multiplexing -identifying frames -identifying routing information -segmenting data and reassembling segments -tracking individual conversations

-conversation multiplexing -segmenting data and reassembling segments -tracking individual conversations

What TCP mechanism is used to enhance performance by allowing a device to continuously send a steady stream of segments as long as the device is also receiving necessary acknowledgements? -socket pair -sliding window -three-way handshake -two-way handshake

-sliding window

What is a socket? -the combination of the source and destination IP address and source and destination Ethernet address -the combination of the source and destination sequence and acknowledgment numbers -the combination of a source IP address and port number or a destination IP address and port number -the combination of the source and destination sequence numbers and port numbers

-the combination of a source IP address and port number or a destination IP address and port number

Which number or set of numbers represents a socket? 21 01-23-45-67-89-AB 10.1.1.15 192.168.1.1:80

192.168.1.1:80

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 randomly selects a source port number. -The client sends an ISN to the server to start the 3-way handshake. -The client sends a synchronization segment to begin the session.

-The client randomly selects a source port number.

Assume a host with IP address 10.1.1.10 wants to request web services from a server at 10.1.1.254. Which of the following would display the correct socket pair? 1099:10.1.1.10, 80:10.1.1.254 10.1.1.10:80, 10.1.1.254:1099 10.1.1.10:1099, 10.1.1.254:80 80:10.1.1.10, 1099:10.1.1.254

10.1.1.10:1099, 10.1.1.254:80

Which two applications would use the TCP transport layer protocol? (Choose two.) FTP HTTP ICMP TFTP VoIP

FTP HTTP

Which UDP header statement is true? It consists of 4 fields in an 8-byte header. It consists of 8 fields in a 10-byte header. It consists of 10 fields in a 20-byte header. It consists of 20 fields in a 40-byte header.

It consists of 4 fields in an 8 byte header.

Why is UDP desirable for protocols that make a simple request and reply transactions? Flow Control Low overhead Reliability Same-order delivery

Low overhead

What field is used by the destination host to reassemble segments into the original order? Control Bits Destination Port Sequence Number Source Port Window Size

Sequence Number

Which two applications would use the UDP transport layer protocol? (Choose two.) FTP HTTP ICMP TFTP VoIP

TFTP VoIP

Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead? (Choose two) -POP3 -VoIP -FTP -DNS -HTTP

VoIP DNS

What field is used to provide flow control? Control Bits Destination Port Sequence Number Source Port Window Size

Window Size