Knowledge Checks

Routing versus forwarding.

Which of the following statements correctly identify the differences between routing and forwarding. Select one or more statements.

Forwarding refers to moving packets from a router’s input to appropriate router output, and is implemented in the control plane.

Routing refers to determining the route taken by packets from source to destination, and is implemented in the control plane.

Routing refers to moving packets from a router’s input to appropriate router output, and is implemented in the data plane.

Routing refers to determining the route taken by packets from source to destination, and is implemented in the data plane.

Forwarding refers to moving packets from a router’s input to appropriate router output, and is implemented in the data plane.

Routing refers to moving packets from a router’s input to appropriate router output, and is implemented in the control plane.

Forwarding refers to determining the route taken by packets from source to destination, and is implemented in the data plane.

Forwarding refers to determining the route taken by packets from source to destination, and is implemented in the control plane.

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Match the name of the approach towards implementing a control plane with a description of how this approach works.

Per-router control plane.

Software-defined networking (SDN).

The network operator installs forwarding tables using the Simple Network Management Protocols (SNMP).
Individual routing algorithm components - with a component operating in each and every router - interact with each other in the control plane. The individual routing algorithm component executing in a given router computes the local fowarding table fir that router.
A (typically) remote controller gathers information from routers, and then computes and installs the forwarding tables in routers.

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