40 Questions
What is the primary purpose of the source port field in a TCP header?
To identify the source application by port number
What is the purpose of the acknowledgment number field in a TCP header?
To indicate the next byte expected from the source
What is the primary function of the header length field in a TCP header?
To indicate the length of the TCP segment header
What is the purpose of the window size field in a TCP header?
To indicate the number of bytes that can be accepted at one time
What is the primary function of the checksum field in a TCP header?
To check for errors in the segment header and data
How many bytes are required for the UDP header?
8 bytes
What is the primary function of TCP?
To provide reliability and reordering of segments
What is a characteristic of UDP?
Data is reconstructed in the order that it is received
What is the primary purpose of the Source Port field in the UDP header?
To identify the source application
Which of the following applications would likely use UDP?
Live video streaming services
What is a key difference between TCP and UDP?
TCP is more reliable than UDP
What is the purpose of the Checksum field in the UDP header?
To detect errors in the datagram
Why are port numbers used in TCP and UDP transport layer protocols?
To manage multiple, simultaneous conversations
What type of communication is an example of an application that handles reliability itself?
Unidirectional communication
How many fields are present in the UDP header?
4 fields
Which of the following is an example of a simple request and reply application that uses UDP?
DNS
Which of the following protocols uses port 53?
DNS
What is the purpose of the netstat command?
To verify connections and identify potential security threats
Which of the following port numbers is registered by Cisco for its RADIUS server authentication process?
1812
What is the primary purpose of well-known port numbers?
To provide a standard set of ports for common network services
What is the purpose of ephemeral ports?
To assign temporary ports to client applications
Which of the following protocols uses port 443?
HTTPS
What is the range of private and/or dynamic ports?
1024-49151
Which of the following protocols uses port 22?
SSH
What is the primary function of flow control in TCP?
To regulate the amount of data that can be sent at one time
What is the relationship between the Ethernet maximum transmission unit (MTU) and the Maximum Segment Size (MSS)?
The MSS is determined by subtracting the IP and TCP headers from the MTU
What happens when congestion occurs on a network?
Packets are discarded by the overloaded router
What is a key feature of Selective ACK (SACK)?
It allows the receiver to explicitly acknowledge which segments were received
What is the advantage of UDP's low overhead?
It reduces the amount of datagram header information
What is the purpose of TCP's congestion handling mechanisms?
To reduce the rate of data transmission during congestion
What is the default Ethernet maximum transmission unit (MTU) in bytes?
1500
What is the result of subtracting the IP and TCP headers from the Ethernet MTU?
1460 bytes
What is the primary role of the transport layer in data communication?
Establishing logical communications between applications
What is the term used to describe a set of data flowing between a source application and a destination application?
Conversation
What is the purpose of adding header information to data in the transport layer?
To perform different functions in managing data communication
How does the transport layer enable different communication conversations to be interleaved on the same network?
Through segmentation and multiplexing
What is the primary responsibility of IP in data communication?
Structuring, addressing, and routing packets
What is the main difference between the transport layer and IP?
The transport layer is responsible for managing conversations, while IP is concerned with packet routing
What is the role of transport layer protocols in data communication?
To specify how to transfer messages between hosts and manage reliability requirements
What is the relationship between the transport layer and the application layer?
The transport layer provides a link between the application layer and the lower layers
Learn about the transport layer, its role in logical communications between applications, and its responsibilities in establishing temporary sessions and reliable transmission of information. Understand the link between the application layer and lower layers in network transmission.
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