Which statement is correct regarding the Junos OS?
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A. B. C. D.B
B. The Junos OS provides separation between the control and forwarding planes.
This statement is correct. One of the key features of the Junos OS is its separation of the control plane and forwarding plane. The control plane is responsible for managing the routing and switching protocols that determine how data is forwarded across a network, while the forwarding plane is responsible for actually forwarding data packets from one interface to another.
By separating these two functions, the Junos OS is able to provide increased stability, scalability, and security. For example, if there is a problem with the control plane (such as a routing protocol issue), it will not affect the forwarding of data packets. Similarly, the forwarding plane can continue to operate even if the control plane is experiencing issues.
This separation is achieved through the use of a modular architecture, with each function (such as routing protocols or interface drivers) running in its own process or "daemon." These daemons communicate with each other using well-defined APIs, ensuring that they are able to work together seamlessly.
A. The same Junos OS image is used on all Junos devices.
This statement is not correct. While the Junos OS is used on all Juniper Networks devices, each device requires its own specific Junos OS image. This is because different devices may have different hardware configurations, and the Junos OS image must be tailored to work with each specific device.
C. Each Junos OS image is based on model-specific source code.
This statement is also not correct. While each Junos OS image is tailored to work with a specific device, they are not based on model-specific source code. Instead, the Junos OS is based on a common codebase that is shared across all Juniper Networks devices.
D. The Junos OS creates a secondary instance of the kernel to ensure redundancy.
This statement is partially correct. The Junos OS does include mechanisms for ensuring redundancy and high availability, but it does not create a secondary instance of the kernel. Instead, it uses a variety of techniques such as graceful Routing Engine switchover (GRES) and non-stop routing (NSR) to ensure that network operations continue uninterrupted in the event of a hardware or software failure.