Computer Networks Technologies and Services September 12th, 2018
First and last name ......................................................... Student ID ................…....
NOTES
i. Nothing else than what is needed to write (pen, eraser), a piece of ID, and possibly water and food can be
taken to the seat where you take your exam. Please leave any other item you might have (coat, bag, phone,
calculator, and any other object) at the front or back of the classroom.
ii. The answers to each question must be written exclusively on the same page of the question, which is the only
material that will be graded.
iii. Do not forget to write your name and student ID in each one of the marked spaces on the exam paper.
iv. In case you will use part of pages containing the questions as a scratch pad, please indicate it clearly and
possibly cross out such parts before handing in the exam.
v. The score assigned to answers varies from zero to the maximum score reported at the end of the question.
Please notice that the maximum scores of all questions do not necessarily sum up to 30.
vi. When answering questions, please feel free to use drawings whenever they can help expressing and
clarifying the answer.
vii. Answers that are not understandable (for example because written badly or with bad handwriting) might be
considered wrong.
viii. During the test, any communication with other classmates is prohibited and will cause the student to be sent
away from the classroom
ix. The instructors and the assistants that are present during the test are there for the sole purpose of verifying
proper progress of the exam. Their role is not giving any support to the interpretation of the text, neither
helping the students to correctly formulate the answers. Please avoid any such request.
Question 1) Considering that the figure below represents a typical A+P deployment scenario during the
transition from IPv4 to IPv6,
1. Assign one or more IP addresses to each interface of each host and network device (writing it
directly on the figure, close to the interface itself) that are required to enable the two hosts in the
figure to communicate with one another, the IPv4 internet, and the IPv6 internet, while minimizing
the number of entries in the IPv6 routing tables of all routers shown in the figure. (8 points)
2. Annotate (directly on the figure) the (name of the) role played by devices and/or functionality offered
(beyond regular IP packet forwarding) and their parameters that are key for the A+P solution to
actually work. (4 points)
3. Schematically describe (in the large dashed box) a packet transiting on the link indicated in the
figure, highlighting information carried by the various headers that is instrumental to the A+P
solution functioning properly. (6 points)
4. Write, directly in the smaller solid line boxes, the entries of the routing tables of the corresponding
routers that enable the two hosts to exchange packets with hosts in the IPv6 internet. (6 points)
