CS 6250 Computer Networks Exam 2 Questions And Answers
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Course
CS 6250
Institution
CS 6250
(Lesson 12) When using DNS caching, what would happen if a host A makes a
request for a domain that was just previously queried by another host?
1. The local DNS server will send the request to the appropriate DNS server to
fetch the IP address.
2. The local DNS server will immediately answer...
CS 6250 Computer Networks
Exam 2 Questions And
Answers
(Lesson 7) A few of the main reasons that SDN arose are: a diversity of
different network equipment (eg routers, switches, firewalls, etc.) using
different protocols that made managing the network difficult, and second a lack
of a central platform to control network equipment. (T/F)
✓~ True
(Lesson 7) The main idea behind SDNs is to divide tasks into smaller functions
so the code is more modular and easy to manage. (T/F)
✓~ False
(Lesson 7) With SDNs the control plane and data plane have independent
evolution and development. (T/F)
✓~ True
,(Lesson 7) In the SDN approach, the SDN controller is physically located at
each router that is present in a network. (T/F)
✓~ False
(Lesson 7) By separating the control plane and the data plane, controlling the
router's behavior became easier using higher order programs. For example, it is
easier to update the router's state or control the path selection. (T/F)
✓~ True
(Lesson 7) In the SDN approach, ISPs or other third parties can take up the
responsibility for computing and distributing the router's forwarding tables.
(T/F)
✓~ True
(Lesson 7) Having the software implementations for SDNs controllers
increasingly open and publicly available makes it hard to control, since any
person could modify the software easily. (T/F)
✓~ False
, (Lesson 7) In SDN networks, the SDN controller is responsible for the
forwarding of traffic. (T/F)
✓~ False
(Lesson 7) The network-control applications are programs that manage the
underlying network with the help of the SDN controller. (T/F)
✓~ True
(Lesson 7) In SDN networks forwarding rules of traffic still have to be based
on IP destination and cannot be based on other metrics, packet header info etc.
(T/F)
✓~ False
(Lesson 7) SDN-controlled switches operate on the: (Data Plane or Control
Plane?)
✓~ Data Plane
(Lesson 7) In an SDN Architecture, the northbound interface keeps track of
information about the state of the hosts, links, switches and other controlled
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