Mastering TCP/IP Fundamentals: Key Networking Concepts

Networking Essentials: TCP/IP Concepts

TCP Flow Control Purpose

Why is flow control used for TCP data transfer?

• To synchronize the speed of data sent.
• To synchronize and order sequence numbers so data is sent in complete numerical order.
• To prevent the receiver from being overwhelmed by data.
• To synchronize window size on the server.
• To simplify data transfer to multiple hosts.

Analyzing Network Output: Key Information

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

• The local host is using well-known port numbers to identify the source ports.
• A request for termination has been sent to 192.135.250.10.
• Communication with 64.100.173.42 is using secure HTTP.
• The local computer is accepting HTTP requests.
• 192.168.1.101:1042 is part of a three-way handshake to 128.107.229.50:80.

TCP Packet Reordering at Destination

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

• Undelivered packets.
• The packets are returned to the source.
• The packets will be delivered and reassembled at the destination.
• The packets will be delivered and not reassembled at the destination.

Dynamic Selection by Source Host

What is dynamically selected by the source host during data transmission?

• Logical destination address.
• Source physical address.
• Address of the default gateway.
• Source port.

Server 1 Action on Missing Acknowledgment

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 for one of several bytes of data transferred. What action will Server 1 take as a result?

• Create a Layer 1 jam signal.
• Reach a timeout and then retransmit the data that needs to be acknowledged.
• Send a RESET bit to the host.
• Resize the window at the top of Layer 4.

Low Overhead Transport Layer Protocol

What transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?

• TCP
• IP
• UDP
• HTTP
• DNS

TCP Flow Control Mechanism

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

• Sequence Numbers
• Session Establishment
• Window Size
• Acknowledgments

Common TCP and UDP Header Information

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

• Sequencing
• Flow Control
• Acknowledgments
• Source and Destination Ports.

Key TCP Features for Reliable Data Transfer

Which three TCP features enable reliable and accurate monitoring of data transmission from source to destination? (Choose three.)

• Encapsulation
• Flow Control
• Connection Services
• Session Establishment
• Sequence and Numbering
• Best-effort delivery

TCP Acknowledgment on Segment Loss

Refer to the exhibit. The initial TCP data exchange between two hosts is shown. Assuming an initial sequence number of 0, what sequence number will be included in Acknowledgment 2 if Segment 6 is lost?

• 2
• 3
• 6
• 1850
• 3431
• 3475