Semester 1 | Module 14: Transport Layer & Module 15: Application Layer

Which transport layer protocol statement is true?

UDP is a best-effort delivery protocol

What field is used to provide flow control?

Window Size

What is a responsibility of transport layer protocols?

tracking individual conversations

Which port group includes port numbers for FTP, HTTP, and TFTP

well-known ports

What is the complete range of TCP and UDP well-known ports?

0 to 1023

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?

10.1.1.10:1099, 10.1.1254:80

Which number or set of numbers represents a socket?

192.168.1.1:80

Which three are transport layer responsibilities? (Choose three.)

Conversation Multiplexing, Segmenting Data and Reassembling Segments, Tracking Individual Conversations

Which applications would use the UDP transport layer protocol?

DHCP, DNS, SNMP, TFTP, VoIP, Video Conferencing

Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead? (Choose two)

DNS, VoIP

Which applications would use the TCP transport layer protocol?

HTTP, FTP, SMTP, SSH

Which UDP header statement is true?

It consists of 4 fields in an 8-byte header.

Why is UDP desirable for protocols that make a simple request and reply transactions?

Low overhead

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

SYN, ACK

What field is used by the destination host to reassemble segments into the original order?

Sequence Number

Which two fields are the same in a TCP and UDP header? (Choose two.)

Source & Destination port number.

Which of the following would be valid source and destination ports for a host connecting to a DNS server?

Source: 49152, Destination: 53

Which transport layer protocol ensures reliable same-order delivery?

TCP

Which transport layer feature is used to establish a connection-oriented session?

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 randomly selects a source port number.

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

What happens when a sending host senses there is congestion?

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.

Which UDP datagram reassembly statement is true?

UDP reassembles the data in the order that it was received

Which transport layer protocol would be used for VoIP applications?

User Datagram Protocol (UDP)

Which two operations are provided by TCP but not by UDP? (Choose two.)

acknowledging received data, retransmitting any unacknowledged data

What type of applications are best suited for using UDP?

applications that are sensitive to delay

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?

netstat

What is the purpose of using a source port number in a TCP communication?

to keep track of multiple conversations between devices

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.

Which TCP header statement is true?

It consists of 10 fields in a 20 byte header

Which layer is responsible for establishing a temporary communication session between the source and destination host applications?

Transport Layer

Which of the following is a stateless best-effort delivery transport layer protocol?

UDP

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?

sliding window

What is a socket?

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