CCNA 4 Exploration – Chapter 4

Chapter 4 – Correct Answers

Which two options represent Layer 4 addressing? (Choose two.)

> identifies the communicating applications
> identifies multiple conversations between the hosts

Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)

> A termination request has been sent to 192.135.250.10.
> Communication with 64.100.173.42 is using HTTP Secure.

Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)

> This contains a Telnet request.
> This is a TCP header.

With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?

> 0 to 1023

Why are port numbers included in the TCP header of a segment?

> to enable a receiving host to forward the data to the appropriate application

Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?

> transport

Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?

> reach a timeout and resend the data that needs to be acknowledged

Why is flow control used for TCP data transfer?

> to prevent the receiver from being overwhelmed by incoming data

Which two options represent Layer 4 addressing? (Choose two.)

> identifies the communicating applications
> identifies multiple conversations between the hosts

Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?

> session establishment

What is dynamically selected by the source host when forwarding data?

> source port

What are two features of the User Datagram Protocol (UDP)? (Choose two.)

> low overhead
> connectionless

What mechanism is used by TCP to provide flow control as segments travel from source to destination?

> window size

Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?

> UDP

Which information is found in both the TCP and UDP header information?

> source and destination

Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?

> flow control
> session establishment
> numbering and sequencing

During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?

> The packets will be delivered and reassembled at the destination.

Which is an important characteristic of UDP?

> minimal delays in data delivery

After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?

> 80

Which event occurs during the transport layer three-way handshake?

> TCP initializes the sequence numbers for the sessions.

Exhibit item:

1

Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)

> The local host is using three client sessions.

> The local host is using web sessions to a remote server.

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