CFall14-15

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.

Which transport layer feature is used to guarantee session establishment?

• UDP ACK flag
• TCP 3-way handshake
• UDP sequence number
• TCP port number

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

• 0 to 255
• 0 to 1023
• 256 – 1023
• 1024 – 49151

What is a socket?

• the combination of the source and destination IP address and source and destination Ethernet address
• 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 and acknowledgment numbers
• the combination of the source and destination sequence numbers and port numbers

A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC?

• 1 segment
• 10 segments
• 100 segments
• 1000 segments

Which factor determines TCP window size?

• the amount of data to be transmitted
• the number of services included in the TCP segment
• the amount of data the destination can process at one time
• the amount of data the source is capable of sending at one time

What does a client do when it has UDP datagrams to send?

• It just sends the datagrams.
• It queries the server to see if it is ready to receive data.
• It sends a simplified three-way handshake to the server.
• It sends to the server a segment with the SYN flag set to synchronize the conversation.

Which three fields are used in a UDP segment header? (Choose three.)

• Window Size
• Length
• Source Port
• Acknowledgment Number
• Checksum

What are two roles of the transport layer in data communication on a network? (Choose two.)

• identifying the proper application for each communication stream
• tracking the individual communication between applications on the source and destination hosts
• providing frame delimiting to identify bits making up a frame
• performing a cyclic redundancy check on the frame for errors
• providing the interface between applications and the underlying network over which messages are transmitted

What information is used by TCP to reassemble and reorder received segments?

• port numbers
• sequence numbers
• acknowledgment numbers
• fragment numbers