CCNA 1 Chapter 9 Exam

Which two characteristics are associated with UDP sessions

Received data is unacknowledged. Destination devices receive traffic with minimal delay. .

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

SYN ACK

What happens if the first packet of a TFTP transfer is lost?

The TFTP application will retry the request if a reply is not received.

Which three application layer protocols use TCP?

HTTP SMTP FTP

192.168.1.2

IP source address

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

0 to 1023

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?

10 segments *With a window of 1000 bytes, the destination host accepts segments until all 1000 bytes of data have been received. Then the destination host sends an acknowledgment.*

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

It just sends the datagrams. *When a client has UDP datagrams to send, it just sends the datagrams.*

Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

ACK

A host device is receiving live streaming video. How does the device account for video data that is lost during transmission?

The device will continue receiving the streaming video, but there may be a momentary disruption.

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 does TCP do if the sending source detects network congestion on the path to the destination?

The source will decrease the amount of data that it sends before it must receive acknowledgements from the destination. *If the source determines that TCP segments are either not being acknowledged or not acknowledged in a timely manner, then it can reduce the number of bytes it sends before receiving an acknowledgment. Notice that it is the source that is reducing the number of unacknowledged bytes it sends. This does not involve changing the window size in the segment header.*

What is a characteristic of UDP?

UDP reassembles the received datagrams in the order they were received. *UDP has no way to reorder the datagrams into their transmission order, so UDP simply reassembles the data in the order it was received and forwards it to the application.​*

What is a characteristic of a TCP server process?

There can be many ports open simultaneously on a server, one for each active server application.

Why does HTTP use TCP as the transport layer protocol?

because HTTP requires reliable delivery

192.168.2.2

destination IP address

What type of information is included in the transport header

destination and source port numbers

80

destination port number

A host device needs to send a large video file across the network while providing data communication to other users. Which feature will allow different communication streams to occur at the same time, without having a single data stream using all available bandwidth?

multiplexing

What kind of port must be requested from IANA in order to be used with a specific application?

registered port

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

sequence numbers

2578

source port number

Which factor determines TCP window size?

the amount of data the destination can process at one time *Window is the number of bytes that the sender will send prior to expecting an acknowledgement from the destination device. The initial window is agreed upon during the session startup via the three-way handshake between source and destination. It is determined by how much data the destination device of a TCP session is able to accept and process at one time.*

What is a socket?

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

During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?

the next byte that the destination expects to receive

When is UDP preferred to TCP?

when an application can tolerate some loss of data during transmission