ECE 358 Final Exam., F’2016
Dept. of Electrical and Computer Engineering
ECE 358 – Computer Networks
Instructor: Sagar Naik
Exam. Date and Time: Dec. 19, 2016, 12:30 PM—3:00 PM
Room(s): MC 2034, 2035
Instructions
...
ECE 358 Final Exam., F’2016
Dept. of Electrical and Computer Engineering
ECE 358 – Computer Networks
Instructor: Sagar Naik
Exam. Date and Time: Dec. 19, 2016, 12:30 PM—3:00 PM
Room(s): MC 2034, 2035
Instructions
• This is a closed book, 2.5 hour exam.
• Should there be a need, make reasonable assumptions and proceed.
• All acronyms have their standard expansions as explained in class.
• Unless otherwise stated, all network layer questions are about IPv4.
• You may use a calculator.
• For full credit, make your answers accurate, complete, and legible.
ECE 358 Final Exam/ Fall 2016 Page 2 of 13
You may continue writing on the reverse side of this page, except page 1.
Q1. [5 marks]
Identify the best matching pairs between Column A and Column B. Write your answers in the Answer
column.
Column A Answer Column B
A This solves the three-node
instability problem
1 This is used by AS-internal
routers to drop IP packets.
B Initial Sequence Number 2 This is used by BGP
routers to enable an AS to
be not used as a transit AS.
C Import policy 3 Routers use it to find the
next hop for IP packets.
D Export policy 4 Hosts run the DHCP
protocol to get it.
E Time To Live 5 It stops duplicate data from
being delivered.
F Destination address in an IP
packet
6 Hosts execute the Switch
Learning algorithm to get
this.
G IP address of a DNS server 7 Split-horizon with poisoned
reverse
H Area 8 It prevents TCP segments
in an old connection from
being accepted in a new
one.
I Hop count 9 This is used by BGP
routers to reject paths to
some destination networks.
J Scaling factor 10 OSPF protocol
K 11 This changes when an IP
packet moves from router
to router.
L 12 This concept, found in
OPSF, is not there in RIP.
M 13 This is used to enlarge the
receive window size in TCP
N 14 This is used by RIP.
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