ITNW 1425: Module 26
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
What is the last segment sent to complete the termination process of a TCP session that was initiated by a client? a segment with the ACK flag set to 1 from the client a segment with the FIN flag set to 1 from the server a segment with the SYN flag set to 1 from the client a segment with the ACK flag set to 1 from the server
A segment with the ACK flag set to 1 from the client
Match each description with the corresponding TCP mechanism. received by a sender before transmitting more segments in a session method of managing segments of data loss used to identify missing segments of data number of bytes a destination device can accept and process at one time acknowledgment retransmission sequence numbers acknowledgment window size
Acknowledgment - received by a sender before transmitting more segments in a session Retransmission - method of managing segments of data loss Sequence numbers - used to identify missing segments of data Acknowledgment window size - number of bytes a destination device can accept and process at one time
Which statement correctly describes data transmission at the transport layer? Retransmission of lost packets is provided by both TCP and UDP. Segmentation is provided by the window size field when the TCP protocol is used. A single datagram can include both a TCP and a UDP header. Both UDP and TCP use port numbers. Segmentation is provided by sequence numbers when UDP is used.
Both UDP and TCP use port numbers.
Which field in the TCP header indicates the status of the three-way handshake process? window reserved checksum control bits
Control bits
Which three are transport layer responsibilities? (Choose three.) 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
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
Destination port number, Source port number
Which two flags in the Layer 4 PDU header are set by a client and server to terminate a TCP conversation? (Choose two.) URG SYN RST FIN ACK
FIN, ACK
Which two applications would use the TCP transport layer protocol? (Choose two.) FTP HTTP ICMP TFTP VoIP
FTP, HTTP
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 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 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.
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
What is a characteristic of the UDP protocol? low overhead guaranteed delivery error correction end-to-end establishment before delivery
Low overhead
Why is UDP desirable for protocols that make a simple request and reply transactions? Flow Control Low overhead Reliability Same-order delivery
Low overhead
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
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
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 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
Match the characteristics to the correct protocols. TCP UDP Flow control Reliable Sequence number Application dependent for error correction Efficient delivery Less overhead
TCP - Flow control UDP - Application dependent for error correction TCP - Reliable UDP - Efficient delivery TCP - Sequence number UDP - Less overhead
Match the description to either TCP or UDP. TCP UDP is connection-oriented uses acknowledgments has a large header is connectionless is suitable for delay-intolerant applications best-effort delivery protocol
TCP - is connection-oriented UDP - is connectionless TCP - uses acknowledgments UDP - is suitable for delay-intolerant applications TCP - has a large header UDP - best-effort delivery protocol
Which two applications would use the UDP transport layer protocol? (Choose two.) FTP HTTP ICMP TFTP VoIP
TFTP, VoIP
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 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.
What is a characteristic of a TCP server process? Every application process running on the server has to be configured to use a dynamic port number. There can be many ports open simultaneously on a server, one for each active server application. An individual server can have two services assigned to the same port number within the same transport layer services. A host running two different applications can have both configured to use the same server port.
There can be many ports open simultaneously on a server, one for each active server application.
Which layer is responsible for establishing a temporary communication session between the source and destination host applications? application layer data link layer network layer physical layer transport layer
Transport layer
Which of the following is a stateless best-effort delivery transport layer protocol? ICMP IP TCP UDP
UDP
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 a best-effort delivery protocol.
What are two features of protocols used within the TCP/IP protocol stack? (Choose two.) The Internet Layer IP protocol has built in mechanisms for ensuring the reliable transmission and receipt of data. UDP is used when an application must be delivered as quickly as possible and some loss of data can be tolerated. TCP and UDP destination port numbers are dynamically generated by the sending device in order to track the responses to requests. TCP mechanisms retransmit data when an acknowledgment is not received from the destination system within a set period of time. The same Transport Layer source port is used for all of the tabs opened at the same time within a web browser.
UDP is used when an application must be delivered as quickly as possible and some loss of data can be tolerated, TCP mechanisms retransmit data when an acknowledgment is not received from the destination system within a set period of time.
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.
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
User Datagram 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
What field is used to provide flow control? Control Bits Destination Port Sequence Number Source Port Window Size
Window Size
