24 Questions
Which network layer function is optional?
Congestion control
What is a basic function of a transparent bridge?
Learns where stations are attached to the LAN
What type of service does the IP network layer offer?
Best-effort connectionless service
Why is the network layer considered the most complex layer?
Because of addressing and routing challenges
Is it true that an end-to-end function is best implemented at a higher level than at a lower level?
False
What is an essential network function?
All of the above
Which device operates at the network layer?
Router
What is a characteristic of the network layer?
It requires coordinated actions of multiple network elements
What is the primary function of the session layer in the OSI model?
To establish, manage, and terminate sessions between applications
In the TCP/IP model, which layer performs the functions of the session layer?
Transport layer
When data is sent from device A to device B, which layer receives the data at B in the OSI model?
Session layer
What is the function of the application layer in the TCP/IP model?
To provide the interface between applications and the network
Which layer is missing from the TCP/IP model?
Session layer
When data is sent from device A to device B, which layer receives the data at B in the TCP/IP model?
Application layer
What is the primary function of the transport layer in the TCP/IP model?
To handle the functions of the session layer
Which layer provides the mechanism for opening, closing, and managing a session between end-user application processes?
Session layer
What is the primary function of a Virtual Private Network (VPN)?
To enable users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network
In which device is the application layer implemented?
End system
What is the function of the transport layer in the end system?
Handles the process to process delivery of the packet through ports
Which layer is responsible for delimiting and synchronizing data exchange?
Session layer
What is the primary function of the network layer?
To route data between devices on a network
In which device is the network layer implemented?
Router
What is the primary function of the physical layer?
To transmit data over a physical medium
Which layer is responsible for providing enhanced security and online anonymity to users on the internet?
VPN
Study Notes
Network Fundamentals
- Network devices: repeaters, bridges, routers (all of the mentioned)
Network Layer Functions
- Congestion control is optional
- Forwarding is a required function
- Routing is a required function
Transparent Bridge Functions
- Learns where stations are attached to the LAN
- Forwards frames from one LAN to another
- Prevents loops in the topology (all of the mentioned)
IP Network Layer Services
- Offers best-effort connectionless service
- Does not offer connection-oriented reliable stream service or connection-oriented transfer of packets with delay guarantee
Network Layer Complexity
- Reasons for complexity: addressing and routing challenges, requiring coordinated actions of multiple, geographically distributed network elements
End-to-End Functions
- Best implemented at a lower level than at a higher level (True)
Essential Network Functions
- Link layer is an essential network function
OSI Model and TCP/IP Model
- In OSI model, the 5th layer to receive data is the Session layer
- In TCP/IP model, the 5th layer to receive data is the Application layer
Application Layer
- Implemented in end systems
- Provides the interface between applications and the network
- Enables users to send and receive data across shared or public networks
Transport Layer
- Implemented in end systems
- Handles process-to-process delivery of packets through ports
Test your knowledge of computer networks with these questions on network devices, layer functions, and bridge operations.
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