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CS6250 Exam 2/154 Accurate Questions with answers
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CS6250 Exam 2/154 AccurateQuestions with answers
What is the control plane responsible for? - -Contains the logic that controls
the forwarding behaviors of routers such as routing protocols and network
middlebox
-What is the data plane responsible for? - -Performs the actual forwarding
as dictated by the control plane
-Why are the data plane and control plane separate? - -Enables us to use
higher-level software programs for control, making it easier to debug and
check the networks behavior
-What is forwarding? - -When a router receives a packet, it must determine
what output link to send it through
-What is routing? - -Determining the path from the sender to the receiver
across the network via routing algorithms
-Where are routing algorithms processed? - -Control plane
-Where are forwarding functions processed? - -Data plane
-What are the main components of an SDN network? - -Infrastructure,
controller, and network-control applications
-What is the SDN-controlled network (infrastructure) responsible for? - -
Forwarding of traffic in a network based on rules computed by the SDN
control plane
-What is the SDN controller responsible for? - -Acts as an interface between
the network elements and network-control applications
-What are network control applications responsible for? - -Programs that
manage the underlying network by collecting information about the network
elements
-In terms of the SDN architecture, what is flow-based forwarding? - -Rules
for forwarding packets can be computed based on any number of header
field values in various layers - Differs from the traditional approach where
only the destination IP determines the forwarding of a packet
, -What are the defining features of an SDN architecture - -Flow-based
forwarding, network control functions, programmable network
-What are network control functions? - -Two components: Controller and
network applications
Controller maintains up-to-date network state information about the network
devices and elements (ex. Hosts, switches, links) and provides it to network-
control applications
-What is a programmable network? - -The "brain" of the SDN control plane;
manages the network
-What plane is the SDN controller part of? - -Control plane
-What are the layers of the SDN controller? - -Communication, network-wide
state-management, interface to the network-control application
-In terms of the SDN controller, what does the communication layer do? - -
Consists of a protocol where the SDN controller and network controlled
elements communicate
-What is the nickname for the communication layer of the SDN controller? -
-Southbound interface
-In terms of the SDN controller, describe the network-wide state-
management layer - -The network-state that is maintained by the controllers
-In terms of SDN, describe the network-control application layer - -This is
how the SDN controller interacts with network-control applications
-What is another name for this layer? - -Northbound interface
-What is the different between conventional and SDN? - -Conventional
networks have tightly coupled data and control plane
Software defined networks decouple the control plane from physical
networking
-What things should all SDN core controllers provide? - -Topology, statistics,
notifications, device management, shortest path forwarding, security
mechanisms
-What is a centralized controller? - -Typically has a single entity that
manages all forwarding devices in the network (a single point of failure)
-What is a distributed controller? - -An entity that runs across multiple data
centers interconnected by a WAN
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